' $Id: configure.vbs $
'' @file
' The purpose of this script is to check for all external tools, headers, and
' libraries VBox OSE depends on.
'
' The script generates the build configuration file 'AutoConfig.kmk' and the
' environment setup script 'env.bat'. A log of what has been done is
' written to 'configure.log'.
'

'
' Copyright (C) 2006-2024 Oracle and/or its affiliates.
'
' This file is part of VirtualBox base platform packages, as
' available from https://www.virtualbox.org.
'
' This program is free software; you can redistribute it and/or
' modify it under the terms of the GNU General Public License
' as published by the Free Software Foundation, in version 3 of the
' License.
'
' This program is distributed in the hope that it will be useful, but
' WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
' General Public License for more details.
'
' You should have received a copy of the GNU General Public License
' along with this program; if not, see <https://www.gnu.org/licenses>.
'
' SPDX-License-Identifier: GPL-3.0-only
'


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'  Header Files
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''
' Includes a vbscript file relative to the script.
sub IncludeFile(strFilename)
   dim objFile, objFileSys
   set objFileSys = WScript.CreateObject("Scripting.FileSystemObject")
   dim strPath : strPath = objFileSys.BuildPath(objFileSys.GetParentFolderName(Wscript.ScriptFullName), strFilename)
   set objFile = objFileSys.openTextFile(strPath)
   executeglobal objFile.readAll()
   objFile.close
   set objFileSys = nothing
end sub

IncludeFile "tools\win\vbscript\helpers.vbs"


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'  Global Variables                                                                                                              '
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dim g_strPath, g_strEnvFile, g_strLogFile, g_strCfgFile
g_strPath = Left(Wscript.ScriptFullName, Len(Wscript.ScriptFullName) - Len("\configure.vbs"))
g_strEnvFile = g_strPath & "\env.bat"
g_strCfgFile = g_strPath & "\AutoConfig.kmk"
g_strLogFile = g_strPath & "\configure.log"
'g_strTmpFile = g_strPath & "\configure.tmp"


' kBuild stuff.
dim g_strPathkBuild, g_strPathkBuildBin, g_strPathDev, g_arrPathDev
g_strPathkBuild = ""
g_strPathkBuildBin = ""
g_strPathDev = ""
g_arrPathDev = Array(":placeholder:")

dim g_strTargetArch, g_StrTargetArchWin
g_strTargetArch = ""
g_StrTargetArchWin = ""

dim g_strHostArch, g_strHostArchWin
g_strHostArch = ""
g_strHostArchWin = ""

' Visual C++ info.
dim g_strPathVCC, g_strVCCVersion
g_strPathVCC = ""
g_strVCCVersion = ""

' SDK and DDK.
dim g_strPathSDK10, g_strPathPSDK, g_strVerPSDK, g_strPathDDK
g_strPathSDK10 = ""
g_strPathPSDK = ""
g_strVerPSDK = ""
g_strPathDDK = ""

' COM disabling.
dim g_blnDisableCOM, g_strDisableCOM
g_blnDisableCOM = False
g_strDisableCOM = ""

' Whether to try the internal stuff first or last.
dim g_blnInternalFirst
g_blnInternalFirst = True

' List of program files locations.
dim g_arrProgramFiles
if EnvGet("ProgramFiles(x86)") <> "" then
   g_arrProgramFiles = Array(EnvGet("ProgramFiles"), EnvGet("ProgramFiles(x86)"))
else
   g_arrProgramFiles = Array(EnvGet("ProgramFiles"))
end if



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'  Helpers: Logging and Logged operations                                                                                        '
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''
' Write a log header with some basic info.
sub LogInit
   FileDelete g_strLogFile
   LogPrint "# Log file generated by " & Wscript.ScriptFullName
   for i = 1 to WScript.Arguments.Count
      LogPrint "# Arg #" & i & ": " & WScript.Arguments.Item(i - 1)
   next
   if Wscript.Arguments.Count = 0 then
      LogPrint "# No arguments given"
   end if
   LogPrint "# Reconstructed command line: " & GetCommandline()

   ' some Wscript stuff
   LogPrint "# Wscript properties:"
   LogPrint "#   ScriptName: " & Wscript.ScriptName
   LogPrint "#   Version:    " & Wscript.Version
   LogPrint "#   Build:      " & Wscript.BuildVersion
   LogPrint "#   Name:       " & Wscript.Name
   LogPrint "#   Full Name:  " & Wscript.FullName
   LogPrint "#   Path:       " & Wscript.Path
   LogPrint "#"


   ' the environment
   LogPrint "# Environment:"
   dim objEnv
   for each strVar in g_objShell.Environment("PROCESS")
      LogPrint "#   " & strVar
   next
   LogPrint "#"
end sub


''
' Append text to the log file.
sub LogPrint(str)
   FileAppendLine g_strLogFile, str
   'Wscript.Echo "dbg: " & str
end sub

''
' Debug output.
sub DbgPrint(str)
   'FileAppendLine g_strLogFile, str
   'Wscript.Echo "dbg: " & str
end sub


''
' Checks if the file exists and logs failures.
function LogFileExists(strPath, strFilename)
   LogFileExists = FileExists(strPath & "/" & strFilename)
   if LogFileExists = False then
      LogPrint "Testing '" & strPath & "': " & strFilename & " not found"
   end if
end function


''
' Checks if the file exists and logs failures.
function LogFileExists1(strPath)
   LogFileExists1 = FileExists(strPath)
   if LogFileExists1 = False then
      LogPrint "Testing '" & strPath & "': file not found"
   end if
end function


''
' Checks if the directory exists and logs failures.
function LogDirExists(strPath)
   LogDirExists = DirExists(strPath)
   if LogDirExists = False then
      LogPrint "Testing '" & strPath & "': not found (or not dir)"
   end if
end function


''
' Finds the first file matching the pattern.
' If no file is found, log the failure.
function LogFindFile(strPath, strPattern)
   dim str, strOutput

   '
   ' Yes, there are some facy database kinda interface to the filesystem
   ' however, breaking down the path and constructing a usable query is
   ' too much hassle. So, we'll do it the unix way...
   '
   if Shell("dir /B """ & DosSlashes(strPath) & "\" & DosSlashes(strPattern) & """", True, strOutput) = 0 _
    And InStr(1, strOutput, Chr(13)) > 1 _
      then
      ' return the first word.
      LogFindFile = Left(strOutput, InStr(1, strOutput, Chr(13)) - 1)
   else
      LogPrint "Testing '" & strPath & "': " & strPattern & " not found"
      LogFindFile = ""
   end if
end function


''
' Finds the first directory matching the pattern.
' If no directory is found, log the failure,
' else return the complete path to the found directory.
function LogFindDir(strPath, strPattern)
   dim str, strOutput

   '
   ' Yes, there are some facy database kinda interface to the filesystem
   ' however, breaking down the path and constructing a usable query is
   ' too much hassle. So, we'll do it the unix way...
   '

   ' List the alphabetically last names as first entries (with /O-N).
   if Shell("dir /B /AD /O-N """ & DosSlashes(strPath) & "\" & DosSlashes(strPattern) & """", True, strOutput) = 0 _
    And InStr(1, strOutput, Chr(13)) > 1 _
      then
      ' return the first word.
      LogFindDir = strPath & "/" & Left(strOutput, InStr(1, strOutput, Chr(13)) - 1)
   else
      LogPrint "Testing '" & strPath & "': " & strPattern & " not found"
      LogFindDir = ""
   end if
end function


''
' Wrapper around RegGetString that logs successes.
function LogRegGetString(strName)
   LogRegGetString = RegGetString(strName)
   if LogRegGetString <> "" then LogPrint "RegGetString(" & strName & ") -> " & LogRegGetString
end function


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'  Helpers: Configuration and Batch Script Writers                                                                               '
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''
' Initializes the config file.
sub CfgInit
   FileDelete g_strCfgFile
   CfgPrint "# -*- Makefile -*-"
   CfgPrint "#"
   CfgPrint "# Build configuration generated by " & GetCommandline()
   CfgPrint "#"
   CfgPrintAssign "VBOX_OSE", "1"
   CfgPrintAssignRecursive "VBOX_VCC_WERR", "$(NO_SUCH_VARIABLE)"
end sub


''
' Prints a string to the config file.
sub CfgPrint(str)
   FileAppendLine g_strCfgFile, str
end sub

''
' Prints a simple assignment to the config file.
sub CfgPrintAssign(strVar, strValue)
   if strValue = "" then
      FileAppendLine g_strCfgFile, RightPad(strVar, 23) & " :="
   else
      FileAppendLine g_strCfgFile, RightPad(strVar, 23) & " := " & strValue
   end if
end sub

''
' Prints a recursive assignment to the config file.
sub CfgPrintAssignRecursive(strVar, strValue)
   FileAppendLine g_strCfgFile, RightPad(strVar, 23) & "  = " & strValue
end sub


''
' Initializes the environment batch script.
sub EnvInit
   FileDelete g_strEnvFile
   EnvPrint "@echo off"
   EnvPrint "rem"
   EnvPrint "rem Environment setup script generated by " & GetCommandline()
   EnvPrint "rem"
end sub


''
' Prints a string to the environment batch script.
sub EnvPrint(str)
   FileAppendLine g_strEnvFile, str
end sub


''
' Helper for EnvPrintPrepend and EnvPrintAppend.
sub EnvPrintCleanup(strEnv, strValue, strSep)
   dim cchValueAndSep
   FileAppendLine g_strEnvFile, "set " & strEnv & "=%" & strEnv & ":" & strSep & strValue & strSep & "=" & strSep & "%"
   cchValueAndSep = Len(strValue) + Len(strSep)
   FileAppendLine g_strEnvFile, "if ""%" & strEnv & "%""==""" & strValue & """ set " & strEnv & "="
   FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~0," & cchValueAndSep & "%""==""" & strValue & strSep & """ set " & strEnv & "=%" & strEnv & ":~" & cchValueAndSep & "%"
   FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~-"  & cchValueAndSep & "%""==""" & strSep & strValue & """  set " & strEnv & "=%" & strEnv & ":~0,-" & cchValueAndSep & "%"
end sub


'' Use by EnvPrintPrepend to skip ';' stripping.
dim g_strPrependCleanEnvVars

''
' Print a statement prepending strValue to strEnv, removing duplicate values.
sub EnvPrintPrepend(strEnv, strValue, strSep)
   ' Remove old values and any leading separators.
   EnvPrintCleanup strEnv, strValue, strSep
   if InStr(1, g_strPrependCleanEnvVars, "|" & strEnv & "|") = 0 then
      FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~0,1%""==""" & strSep & """ set " & strEnv & "=%" & strEnv & ":~1%"
      FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~0,1%""==""" & strSep & """ set " & strEnv & "=%" & strEnv & ":~1%"
      g_strPrependCleanEnvVars = g_strPrependCleanEnvVars & "|" & strEnv & "|"
   end if
   ' Do the setting
   FileAppendLine g_strEnvFile, "set " & strEnv & "=" & strValue & strSep & "%" & strEnv & "%"
end sub


'' Use by EnvPrintPrepend to skip ';' stripping.
dim g_strAppendCleanEnvVars

''
' Print a statement appending strValue to strEnv, removing duplicate values.
sub EnvPrintAppend(strEnv, strValue, strSep)
   ' Remove old values and any trailing separators.
   EnvPrintCleanup strEnv, strValue, strSep
   if InStr(1, g_strAppendCleanEnvVars, "|" & strEnv & "|") = 0 then
      FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~-1%""==""" & strSep & """ set " & strEnv & "=%" & strEnv & ":~0,-1%"
      FileAppendLine g_strEnvFile, "if ""%" & strEnv & ":~-1%""==""" & strSep & """ set " & strEnv & "=%" & strEnv & ":~0,-1%"
      g_strAppendCleanEnvVars = g_strAppendCleanEnvVars & "|" & strEnv & "|"
   end if
   ' Do the setting.
   FileAppendLine g_strEnvFile, "set " & strEnv & "=%" & strEnv & "%" & strSep & strValue
end sub


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'  Feature disabling                                                                                                             '
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''
' No COM
sub DisableCOM(strReason)
   if g_blnDisableCOM = False then
      LogPrint "Disabled COM components: " & strReason
      g_blnDisableCOM = True
      g_strDisableCOM = strReason
      CfgPrintAssign "VBOX_WITH_MAIN", ""
      CfgPrintAssign "VBOX_WITH_QTGUI", ""
      CfgPrintAssign "VBOX_WITH_VBOXSDL", ""
      CfgPrintAssign "VBOX_WITH_DEBUGGER_GUI", ""
   end if
end sub


''
' No UDPTunnel
sub DisableUDPTunnel(strReason)
   if g_blnDisableUDPTunnel = False then
      LogPrint "Disabled UDPTunnel network transport: " & strReason
      g_blnDisableUDPTunnel = True
      g_strDisableUDPTunnel = strReason
      CfgPrintAssign "VBOX_WITH_UDPTUNNEL", ""
   end if
end sub


''
' No SDL
sub DisableSDL(strReason)
   if g_blnDisableSDL = False then
      LogPrint "Disabled SDL frontend: " & strReason
      g_blnDisableSDL = True
      g_strDisableSDL = strReason
      CfgPrintAssign "VBOX_WITH_VBOXSDL", ""
   end if
end sub


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'  Tool/Library Locating and Checking                                                                                            '
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''
' Generic helper for looking for a tools under g_strPathDev.
'
' The callback function takes the '.../tools/win.arch/tool/version' dir and
' varUser as arguments, returning an non-empty string if it was found suitable.
'
function SearchToolsEx(strTool, strVerPrefix, ByRef fnCallback, ByRef varUser, ByRef arrToolsDirs)
   dim strToolsDir, arrDirs, strDir
   SearchToolsEx = ""
   for each strToolsDir in arrToolsDirs
      arrDirs = GetSubdirsStartingWithRVerSorted(strToolsDir, strVerPrefix)
      for each strDir in arrDirs
         SearchToolsEx = fnCallback(strToolsDir & "/" & strDir, varUser)
         if SearchToolsEx <> "" then
            exit function
         end if
      next
   next
end function

'' Search under g_strPathDev for a tool, target arch only.
function SearchTargetTools(strTool, strVerPrefix, ByRef fnCallback, ByRef varUser)
   dim i
   redim arrToolsDirs(ArraySize(g_arrPathDev) - 1)
   for i = 0 to UBound(g_arrPathDev)
      arrToolsDirs(i) = g_arrPathDev(i) & "/win." & g_strTargetArch & "/" & strTool
   next
   SearchTargetTools = SearchToolsEx(strTool, strVerPrefix, fnCallback, varUser, arrToolsDirs)
end function

'' Search under g_strPathDev for a tool, target arch and alternative arches.
function SearchTargetPlusTools(strTool, strVerPrefix, ByRef fnCallback, ByRef varUser)
   dim i
   redim arrToolsDirs(ArraySize(g_arrPathDev)*3 - 1)
   for i = 0 to UBound(g_arrPathDev)
      arrToolsDirs(i*3 + 0) = g_arrPathDev(i) & "/win." & g_strTargetArch & "/" & strTool
      arrToolsDirs(i*3 + 1) = g_arrPathDev(i) & "/win.x86/" & strTool
      arrToolsDirs(i*3 + 2) = g_arrPathDev(i) & "/win.amd64/" & strTool
   next
   SearchTargetPlusTools = SearchToolsEx(strTool, strVerPrefix, fnCallback, varUser, arrToolsDirs)
end function

'' Search under g_strPathDev for a tool, host arch first.
function SearchHostTools(strTool, strVerPrefix, ByRef fnCallback, ByRef varUser)
   dim i
   redim arrToolsDirs(ArraySize(g_arrPathDev) * 3 - 1)
   for i = 0 to UBound(g_arrPathDev)
      arrToolsDirs(i*3 + 0) = g_arrPathDev(i) & "/win." & g_strHostArch & "/" & strTool
      arrToolsDirs(i*3 + 1) = g_arrPathDev(i) & "/win.x86/" & strTool
      arrToolsDirs(i*3 + 2) = g_arrPathDev(i) & "/win.amd64/" & strTool
   next
   SearchHostTools = SearchToolsEx(strTool, strVerPrefix, fnCallback, varUser, arrToolsDirs)
end function

'' Search under g_strPathDev for a tool, common dir first.
function SearchCommonTools(strTool, strVerPrefix, ByRef fnCallback, ByRef varUser)
   dim i
   redim arrToolsDirs(ArraySize(g_arrPathDev) * 4 - 1)
   for i = 0 to UBound(g_arrPathDev)
      arrToolsDirs(i*4 + 0) = g_arrPathDev(i) & "/win.common/" & strTool
      arrToolsDirs(i*4 + 1) = g_arrPathDev(i) & "/win." & g_strTargetArch & "/" & strTool
      arrToolsDirs(i*4 + 2) = g_arrPathDev(i) & "/win.x86/" & strTool
      arrToolsDirs(i*4 + 3) = g_arrPathDev(i) & "/win.amd64/" & strTool
   next
   SearchCommonTools = SearchToolsEx(strTool, strVerPrefix, fnCallback, varUser, arrToolsDirs)
end function

''
' Checks the the path doesn't contain characters the tools cannot deal with.
'
sub CheckSourcePath
   dim sPwd

   sPwd = PathAbsLong(g_strPath)    ' Must check the long version.
   if InStr(1, sPwd, " ") > 0 then
      MsgError "Source path contains spaces! Please move it. (" & sPwd & ")"
   end if
   if InStr(1, sPwd, "$") > 0 then
      MsgError "Source path contains the '$' char! Please move it. (" & sPwd & ")"
   end if
   if InStr(1, sPwd, "%") > 0 then
      MsgError "Source path contains the '%' char! Please move it. (" & sPwd & ")"
   end if
   if  InStr(1, sPwd, Chr(10)) > 0 _
    or InStr(1, sPwd, Chr(13)) > 0 _
    or InStr(1, sPwd, Chr(9)) > 0 _
   then
      MsgError "Source path contains control characters! Please move it. (" & sPwd & ")"
   end if
   Print "Source path: OK"
end sub


''
' Checks for kBuild - very simple :)
'
sub CheckForkBuild(strOptkBuild)
   dim blnNeedEnvVars, strOutput
   PrintHdr "kBuild"

   '
   ' Check if there is a 'kmk' in the path somewhere without
   ' any KBUILD_*PATH stuff around.
   '
   blnNeedEnvVars = True
   g_strPathkBuild = strOptkBuild
   g_strPathkBuildBin = ""
   if   (g_strPathkBuild = "") _
    And (EnvGetFirst("KBUILD_PATH", "PATH_KBUILD") = "") _
    And (EnvGetFirst("KBUILD_BIN_PATH", "PATH_KBUILD_BIN") = "") _
    And (Shell("kmk.exe --version", True, strOutput) = 0) _
    And (InStr(1,strOutput, "kBuild Make 0.1") > 0) _
    And (InStr(1,strOutput, "KBUILD_PATH") > 0) _
    And (InStr(1,strOutput, "KBUILD_BIN_PATH") > 0) then
      '' @todo Need to parse out the KBUILD_PATH and KBUILD_BIN_PATH values to complete the other tests.
      'blnNeedEnvVars = False
      MsgWarning "You've installed kBuild it seems. configure.vbs hasn't been updated to " _
         & "deal with that yet and will use the one it ships with. Sorry."
   end if

   '
   ' Check for the KBUILD_PATH env.var. and fall back on root/kBuild otherwise.
   '
   if g_strPathkBuild = "" then
      g_strPathkBuild = EnvGetFirst("KBUILD_PATH", "PATH_KBUILD")
      if (g_strPathkBuild <> "") and (FileExists(g_strPathkBuild & "/footer.kmk") = False) then
         MsgWarning "Ignoring incorrect kBuild path (KBUILD_PATH=" & g_strPathkBuild & ")"
         g_strPathkBuild = ""
      end if

      if g_strPathkBuild = "" then
         g_strPathkBuild = g_strPath & "/kBuild"
      end if
   end if

   g_strPathkBuild = UnixSlashes(PathAbs(g_strPathkBuild))

   '
   ' Check for env.vars that kBuild uses (do this early to set g_strTargetArch).
   '
   str = EnvGetFirst("KBUILD_TYPE", "BUILD_TYPE")
   if   (str <> "") _
    And (InStr(1, "|release|debug|profile|kprofile", str) <= 0) then
      EnvPrint "set KBUILD_TYPE=release"
      EnvSet "KBUILD_TYPE", "release"
      MsgWarning "Found unknown KBUILD_TYPE value '" & str &"' in your environment. Setting it to 'release'."
   end if

   str = EnvGetFirst("KBUILD_TARGET", "BUILD_TARGET")
   if   (str <> "") _
    And (InStr(1, "win|win32|win64", str) <= 0) then '' @todo later only 'win' will be valid. remember to fix this check!
      EnvPrint "set KBUILD_TARGET=win"
      EnvSet "KBUILD_TARGET", "win"
      MsgWarning "Found unknown KBUILD_TARGET value '" & str &"' in your environment. Setting it to 'win32'."
   end if

   str = EnvGetFirst("KBUILD_TARGET_ARCH", "BUILD_TARGET_ARCH")
   if   (str <> "") _
    And (InStr(1, "x86|amd64", str) <= 0) then
      EnvPrint "set KBUILD_TARGET_ARCH=x86"
      EnvSet "KBUILD_TARGET_ARCH", "x86"
      MsgWarning "Found unknown KBUILD_TARGET_ARCH value '" & str &"' in your environment. Setting it to 'x86'."
      str = "x86"
   end if
   if g_strTargetArch = "" then '' command line parameter --target-arch=x86|amd64 has priority
      if str <> "" then
         g_strTargetArch = str
      elseif (EnvGet("PROCESSOR_ARCHITEW6432") = "AMD64" ) _
          Or (EnvGet("PROCESSOR_ARCHITECTURE") = "AMD64" ) then
         g_strTargetArch = "amd64"
      else
         g_strTargetArch = "x86"
      end if
   else
      if InStr(1, "x86|amd64", g_strTargetArch) <= 0 then
         EnvPrint "set KBUILD_TARGET_ARCH=x86"
         EnvSet "KBUILD_TARGET_ARCH", "x86"
         MsgWarning "Unknown --target-arch=" & str &". Setting it to 'x86'."
      end if
   end if
   LogPrint " Target architecture: " & g_strTargetArch & "."
   Wscript.Echo " Target architecture: " & g_strTargetArch & "."
   EnvPrint "set KBUILD_TARGET_ARCH=" & g_strTargetArch

   ' Windows variant of the arch name.
   g_strTargetArchWin = g_strTargetArch
   if g_strTargetArchWin = "amd64" then g_strTargetArchWin = "x64"

   str = EnvGetFirst("KBUILD_TARGET_CPU", "BUILD_TARGET_CPU")
    ' perhaps a bit pedantic this since this isn't clearly define nor used much...
   if   (str <> "") _
    And (InStr(1, "i386|i486|i686|i786|i868|k5|k6|k7|k8", str) <= 0) then
      EnvPrint "set BUILD_TARGET_CPU=i386"
      EnvSet "KBUILD_TARGET_CPU", "i386"
      MsgWarning "Found unknown KBUILD_TARGET_CPU value '" & str &"' in your environment. Setting it to 'i386'."
   end if

   str = EnvGetFirst("KBUILD_HOST", "BUILD_PLATFORM")
   if   (str <> "") _
    And (InStr(1, "win|win32|win64", str) <= 0) then '' @todo later only 'win' will be valid. remember to fix this check!
      EnvPrint "set KBUILD_HOST=win"
      EnvSet "KBUILD_HOST", "win"
      MsgWarning "Found unknown KBUILD_HOST value '" & str &"' in your environment. Setting it to 'win32'."
   end if

   str = EnvGetFirst("KBUILD_HOST_ARCH", "BUILD_PLATFORM_ARCH")
   if str <> "" then
      if InStr(1, "x86|amd64", str) <= 0 then
         str = "x86"
         MsgWarning "Found unknown KBUILD_HOST_ARCH value '" & str &"' in your environment. Setting it to 'x86'."
      end if
   elseif (EnvGet("PROCESSOR_ARCHITEW6432") = "AMD64" ) _
       Or (EnvGet("PROCESSOR_ARCHITECTURE") = "AMD64" ) then
      str = "amd64"
   else
      str = "x86"
   end if
   LogPrint " Host architecture: " & str & "."
   Wscript.Echo " Host architecture: " & str & "."
   EnvPrint "set KBUILD_HOST_ARCH=" & str
   g_strHostArch = str

   ' Windows variant of the arch name.
   g_strHostArchWin = g_strHostArch
   if g_strHostArchWin = "amd64" then g_strHostArchWin = "x64"


   str = EnvGetFirst("KBUILD_HOST_CPU", "BUILD_PLATFORM_CPU")
    ' perhaps a bit pedantic this since this isn't clearly define nor used much...
   if   (str <> "") _
    And (InStr(1, "i386|i486|i686|i786|i868|k5|k6|k7|k8", str) <= 0) then
      EnvPrint "set KBUILD_HOST_CPU=i386"
      EnvSet "KBUILD_HOST_CPU", "i386"
      MsgWarning "Found unknown KBUILD_HOST_CPU value '" & str &"' in your environment. Setting it to 'i386'."
   end if

   '
   ' Determin the location of the kBuild binaries.
   '
   if g_strPathkBuildBin = "" then
      g_strPathkBuildBin = g_strPathkBuild & "/bin/win." & g_strHostArch
      if FileExists(g_strPathkBuildBin & "/kmk.exe") = False then
         g_strPathkBuildBin = g_strPathkBuild & "/bin/win.x86"
      end if
   end if
   g_strPathkBuildBin = UnixSlashes(PathAbs(g_strPathkBuildBin))

   '
   ' Perform basic validations of the kBuild installation.
   '
   if  (FileExists(g_strPathkBuild & "/footer.kmk") = False) _
    Or (FileExists(g_strPathkBuild & "/header.kmk") = False) _
    Or (FileExists(g_strPathkBuild & "/rules.kmk") = False) then
      MsgFatal "Can't find valid kBuild at '" & g_strPathkBuild & "'. Either there is an " _
         & "incorrect KBUILD_PATH in the environment or the checkout didn't succeed."
      exit sub
   end if
   if  (FileExists(g_strPathkBuildBin & "/kmk.exe") = False) _
    Or (FileExists(g_strPathkBuildBin & "/kmk_ash.exe") = False) then
      MsgFatal "Can't find valid kBuild binaries at '" & g_strPathkBuildBin & "'. Either there is an " _
         & "incorrect KBUILD_PATH in the environment or the checkout didn't succeed."
      exit sub
   end if

   if (Shell(DosSlashes(g_strPathkBuildBin & "/kmk.exe") & " --version", True, strOutput) <> 0) then
      MsgFatal "Can't execute '" & g_strPathkBuildBin & "/kmk.exe --version'. check configure.log for the out."
      exit sub
   end if

   '
   ' If KBUILD_DEVTOOLS is set, check that it's pointing to something useful.
   '
   str = UnixSlashes(EnvGet("KBUILD_DEVTOOLS"))
   g_strPathDev = str
   if   str <> "" _
    and LogDirExists(str & "/bin") _
    and LogDirExists(str & "/win.amd64/bin") _
    and LogDirExists(str & "/win.x86/bin") _
   then
      LogPrint "Found KBUILD_DEVTOOLS='" & str & "'."
   elseif str <> "" then
      MsgWarning "Ignoring bogus KBUILD_DEVTOOLS='" & str &"' in your environment!"
      g_strPathDev = strNew
   end if
   if g_strPathDev = "" then
      g_strPathDev = UnixSlashes(g_strPath & "/tools")
      LogPrint "Using KBUILD_DEVTOOLS='" & g_strPathDev & "'."
      if str <> "" then
         EnvPrint "set KBUILD_DEVTOOLS=" & g_strPathDev
         EnvSet "KBUILD_DEVTOOLS", g_strPathDev
      end if
   end if
   g_arrPathDev(ArrayFindString(g_arrPathDev, ":placeholder:")) = g_strPathDev

   '
   ' Write KBUILD_PATH and updated PATH to the environment script if necessary.
   '
   if blnNeedEnvVars = True then
      EnvPrint "set KBUILD_PATH=" & g_strPathkBuild
      EnvSet "KBUILD_PATH", g_strPathkBuild

      if Right(g_strPathkBuildBin, 7) = "win.x86" then
         EnvPrintCleanup "PATH", DosSlashes(Left(g_strPathkBuildBin, Len(g_strPathkBuildBin) - 7) & "win.amd64"), ";"
      end if
      if Right(g_strPathkBuildBin, 9) = "win.amd64" then
         EnvPrintCleanup "PATH", DosSlashes(Left(g_strPathkBuildBin, Len(g_strPathkBuildBin) - 9) & "win.x86"), ";"
      end if
      EnvPrintPrepend "PATH", DosSlashes(g_strPathkBuildBin), ";"
      EnvPrependPathItem "PATH", g_strPathkBuildBin, ";"
   end if

   PrintResult "kBuild", g_strPathkBuild
   PrintResult "kBuild binaries", g_strPathkBuildBin
end sub


''
' Checks for Visual C++ version 16 (2019), 15 (2017), 14 (2015), 12 (2013), 11 (2012) or 10 (2010).
'
sub CheckForVisualCPP(strOptVC, strOptVCCommon)
   PrintHdr "Visual C++"

   '
   ' Try find it...
   '
   dim objState, strProgFiles
   set objState = new VisualCPPState
   objState.check strOptVC, strOptVCCommon
   if g_blnInternalFirst = True then objState.checkInternal
   objState.checkProgItems "2019"
   objState.checkProgFiles "Microsoft Visual Studio\2019\BuildTools\VC"
   objState.checkProgFiles "Microsoft Visual Studio\2019\Professional\VC"
   objState.checkProgFiles "Microsoft Visual Studio\2019\Community\VC"
   objState.checkRegistry "Microsoft\VisualStudio\SxS\VS7\16.0",             "VC", ""        ' doesn't work.
   objState.checkProgItems "2017"
   objState.checkProgFiles "Microsoft Visual Studio\2017\BuildTools\VC"
   objState.checkProgFiles "Microsoft Visual Studio\2017\Professional\VC"
   objState.checkProgFiles "Microsoft Visual Studio\2017\Community\VC"
   objState.checkProgFiles "Microsoft Visual Studio\2017\Express\VC"
   objState.checkRegistry "Microsoft\VisualStudio\SxS\VS7\15.0",             "VC", ""
   objState.checkRegistry "Microsoft\VisualStudio\SxS\VS7\14.0",             "VC", "Common7"
   objState.checkRegistry "Microsoft\VisualStudio\SxS\VS7\12.0",             "VC", "Common7" '?
   objState.checkRegistry "Microsoft\VisualStudio\SxS\VS7\11.0",             "VC", "Common7" '?
   objState.checkProg "cl.exe"
   objState.checkRegistry "Microsoft\VisualStudio\10.0\Setup\VS\ProductDir", "VC", "Common7"
   if g_blnInternalFirst = False then objState.checkInternal

   if objState.m_blnFound = False then
      MsgError "Cannot find cl.exe (Visual C++) anywhere on your system. Check the build requirements."
      exit sub
   end if
   g_strPathVCC = objState.m_strPathVC
   g_strVCCVersion = objState.m_strVersion

   '
   ' Ok, emit build config variables.
   '
   CfgPrintAssign "VBOX_VCC_TOOL_STEM", objState.m_strVersion
   CfgPrintAssign "PATH_TOOL_" & objState.m_strVersion, g_strPathVCC
   CfgPrintAssign "PATH_TOOL_" & objState.m_strVersion & "X86",   "$(PATH_TOOL_" & objState.m_strVersion & ")"
   CfgPrintAssign "PATH_TOOL_" & objState.m_strVersion & "AMD64", "$(PATH_TOOL_" & objState.m_strVersion & ")"

   if   objState.m_strVersion = "VCC100" _
     or objState.m_strVersion = "VCC110" _
     or objState.m_strVersion = "VCC120" _
     or objState.m_strVersion = "VCC140" _
   then
      CfgPrintAssign "VBOX_WITH_NEW_VCC", "" '?? for VCC110+
   else
      CfgPrintAssign "VBOX_WITH_NEW_VCC", "1"
   end if
   PrintResult "Visual C++ " & objState.m_strVersion, g_strPathVCC

   ' And the env.bat path fix.
   if objState.m_strPathVCCommon <> "" then
      EnvPrintAppend "PATH", DosSlashes(objState.m_strPathVCCommon) & "\IDE", ";"
   end if
end sub

'' Class we use for detecting Visual C++
class VisualCPPState
   public m_blnFound
   public m_strPathVC
   public m_strPathVCCommon
   public m_strVersion
   public m_strClVersion
   public m_blnNewLayout

   private sub Class_Initialize
      m_blnFound        = False
      m_strPathVC       = ""
      m_strPathVCCommon = ""
      m_strVersion      = ""
      m_strClVersion    = ""
      m_blnNewLayout    = false
   end sub

   public function checkClExe(strClExe)
      ' We'll have to make sure mspdbXX.dll is somewhere in the PATH.
      dim strSavedPath, rcExit, strOutput

      strSavedPath = EnvGet("PATH")
      if (m_strPathVCCommon <> "") then
         EnvAppendPathItem "PATH", m_strPathVCCommon & "/IDE", ";"
      end if
      rcExit = Shell(DosSlashes(strClExe), True, strOutput)
      EnvSet "PATH", strSavedPath

      checkClExe = False
      if rcExit = 0 then
         ' Extract the ' Version xx.yy.build.zz for arch' bit.
         dim offVer, offEol, strVer
         strVer = ""
         offVer = InStr(1, strOutput, " Version ")
         if offVer > 0 then
            offVer = offVer + Len(" Version ")
            offEol = InStr(offVer, strOutput, Chr(13))
            if offEol > 0 then
               strVer = Trim(Mid(strOutput, offVer, offEol - offVer))
            end if
         end if

         ' Check that it's a supported version
         checkClExe = True
         if InStr(1, strVer, "16.") = 1 then
            m_strVersion = "VCC100"
         elseif InStr(1, strVer, "17.") = 1 then
            m_strVersion = "VCC110"
            LogPrint "The Visual C++ compiler ('" & strClExe & "') version isn't really supported, but may work: " & strVer
         elseif InStr(1, strVer, "18.") = 1 then
            m_strVersion = "VCC120"
            LogPrint "The Visual C++ compiler ('" & strClExe & "') version isn't really supported, but may work: " & strVer
         elseif InStr(1, strVer, "19.0") = 1 then
            m_strVersion = "VCC140"
            LogPrint "The Visual C++ compiler ('" & strClExe & "') version isn't really supported, but may work: " & strVer
         elseif InStr(1, strVer, "19.1") = 1 then
            m_strVersion = "VCC141"
            LogPrint "The Visual C++ compiler ('" & strClExe & "') version isn't really supported, but may work: " & strVer
         elseif InStr(1, strVer, "19.2") = 1 then
            m_strVersion = "VCC142"
         else
            LogPrint "The Visual C++ compiler we found ('" & strClExe & "') isn't in the 10.0-19.2x range (" & strVer & ")."
            LogPrint "Check the build requirements and select the appropriate compiler version."
            checkClExe = False
            exit function
         end if
         LogPrint "'" & strClExe & "' = " & m_strVersion & " (" & strVer & ")"
      else
         LogPrint "Executing '" & strClExe & "' (which we believe to be the Visual C++ compiler driver) failed (rcExit=" & rcExit & ")."
      end if
   end function

   public function checkInner(strPathVC) ' For the new layout only
      if m_blnFound = False then
         if   LogDirExists(strPathVC & "/bin") _
          and LogDirExists(strPathVC & "/lib") _
          and LogDirExists(strPathVC & "/include") _
          and LogFileExists(strPathVC, "include/stdarg.h") _
          and LogFileExists(strPathVC, "lib/x64/libcpmt.lib") _
          and LogFileExists(strPathVC, "lib/x86/libcpmt.lib") _
          and LogFileExists(strPathVC, "bin/Host" & g_strHostArchWin & "/" & g_strTargetArchWin & "/cl.exe") _
          and LogFileExists(strPathVC, "bin/Host" & g_strHostArchWin & "/" & g_strHostArchWin & "/cl.exe") _
         then
            LogPrint " => seems okay. new layout."
            m_blnFound = checkClExe(strPathVC & "/bin/Host" & g_strHostArchWin & "/" & g_strTargetArchWin & "/cl.exe")
            if m_blnFound then
               m_strPathVC = strPathVC
            end if
         end if
      end if
      checkInner = m_blnFound
   end function

   public function check(strPathVC, strPathVCommon)
      if (m_blnFound = False) and (strPathVC <> "") then
         m_strPathVC       = UnixSlashes(PathAbs(strPathVC))
         m_strPathVCCommon = strPathVCCommon
         m_strVersion      = ""

         LogPrint "Trying: strPathVC=" & m_strPathVC & " strPathVCCommon=" & m_strPathVCCommon
         if LogDirExists(m_strPathVC) then
            ' 15.0+ layout?  This is fun because of the multiple CL versions (/tools/msvc/xx.yy.bbbbb/).
            ' OTOH, the user may have pointed us directly to one of them.
            if LogDirExists(m_strPathVC & "/Tools/MSVC") then
               m_blnNewLayout = True
               LogPrint " => seems okay. new layout."
               dim arrFolders, i
               arrFolders = GetSubdirsStartingWithVerSorted(m_strPathVC & "/Tools/MSVC", "14.2")
               if UBound(arrFolders) < 0 then arrFolders = GetSubdirsStartingWithVerSorted(m_strPathVC & "/Tools/MSVC", "14.1")
               if UBound(arrFolders) < 0 then arrFolders = GetSubdirsStartingWithVerSorted(m_strPathVC & "/Tools/MSVC", "1")
               for i = UBound(arrFolders) to LBound(arrFolders) step -1
                  if checkInner(m_strPathVC & "/Tools/MSVC/" & arrFolders(i)) then exit for ' modifies m_strPathVC on success
               next
            elseif LogDirExists(m_strPathVC & "/bin/HostX64") _
                or LogDirExists(m_strPathVC & "/bin/HostX86") then
               checkInner(m_strPathVC)
            ' 14.0 and older layout?
            elseif LogFileExists(m_strPathVC, "/bin/cl.exe") then
               m_blnNewLayout = False
               if   LogFileExists(m_strPathVC, "bin/link.exe") _
                and LogFileExists(m_strPathVC, "include/string.h") _
                and LogFileExists(m_strPathVC, "lib/libcmt.lib") _
                and LogFileExists(m_strPathVC, "lib/msvcrt.lib") _
               then
                  LogPrint " => seems okay. old layout."
                  m_blnFound = checkClExe(m_strPathVC & "/bin/cl.exe")
               end if
            end if
         end if
      end if
      check = m_bldFound
   end function

   public function checkProg(strProg)
      if m_blnFound = False then
         dim str, i, offNewLayout
         str = Which(strProg)
         if str <> "" then
            LogPrint "checkProg: '" & strProg & "' -> '" & str & "'"
            if FileExists(PathStripFilename(str) & "/build.exe") then
               Warning "Ignoring DDK cl.exe (" & str & ")." ' don't know how to deal with this cl.
            else
               ' Assume we've got cl.exe from somewhere under the 'bin' directory..
               m_strPathVC = PathParent(PathStripFilename(str))
               for i = 1 To 5
                  if LogDirExists(m_strPathVC & "/include") then
                     m_strPathVCCommon = PathParent(m_strPathVC) & "/Common7"
                     if DirExists(m_strPathVCCommon) = False then
                        m_strPathVCCommon = ""
                        ' New layout?
                        offNewLayout = InStr(1, LCase(DosSlashes(m_strPathVC)), "\tools\msvc\")
                        if offNewLayout > 0 then m_strPathVC = Left(m_strPathVC, offNewLayout)
                     end if
                     check m_strPathVC, m_strPathVCCommon
                     exit for
                  end if
                  m_strPathVC = PathParent(m_strPathVC)
               next
            end if
         end if
      end if
      checkProg = m_bldFound
   end function

   public function checkProgFiles(strSubdir)
      if m_blnFound = False then
         dim strProgFiles
         for each strProgFiles in g_arrProgramFiles
            check strProgFiles & "/" & strSubdir, ""
         next
      end if
      checkProgFiles = m_blnFound
   end function

   public function checkRegistry(strValueNm, strVCSubdir, strVCommonSubdir)
      if m_blnFound = False then
         dim str, strPrefix, arrPrefixes
         arrPrefixes = Array("HKLM\SOFTWARE\Wow6432Node\", "HKLM\SOFTWARE\", "HKCU\SOFTWARE\Wow6432Node\", "HKCU\SOFTWARE\")
         for each strPrefix in arrPrefixes
            str = LogRegGetString(strPrefix & strValueNm)
            if str <> "" then
               LogPrint "checkRegistry: '" & strPrefix & strValueNm & "' -> '" & str & "'"
               if check(str & strVCSubdir, str & strVCommonSubdir) = True then
                  exit for
               end if
            end if
         next
      end if
      checkRegistry = m_bldFound
   end function

   public function checkProgItems(strVersionYear)
      if m_blnFound = False then
         dim strCandidate
         for each strCandidate in CollectFromProgramItemLinks(GetRef("VisualCPPCallback"), strVersionYear)
            check strCandidate, ""
         next
      end if
      checkProgItems = m_blnFound
   end function

   public function checkInternal
      dim strPathDev
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.amd64/vcc/v14.2",  "" : next
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.amd64/vcc/v14.2",  "" : next
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.amd64/vcc/v14.1",  "" : next
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.amd64/vcc/v14.0",  "" : next
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.amd64/vcc/v10sp1", "" : next
      for each strPathDev in g_arrPathDev : check strPathDev & "/win.x86/vcc/v10sp1",   "" : next
      checkInternal = m_blnFound
   end function
end class

' See checkProgItems()
function VisualCPPCallback(ByRef arrStrings, cStrings, ByRef strVersionYear)
   VisualCPPCallback = ""
   ' We're looking for items with three strings like this:
   '   C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Visual Studio 2019\Visual Studio Tools\VC\x64 Native Tools Command Prompt for VS 2019.lnk
   '   C:\Windows\system32\cmd.exe
   '   /k "C:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\VC\Auxiliary\Build\vcvars64.bat"
   if cStrings >= 3 then
      if InStr(1, arrStrings(0), strVersionYear) > 0 then
         dim strTail : strTail = "\Auxiliary\Build\vcvars64.bat"""
         dim str     : str     = arrStrings(UBound(arrStrings))
         if StrComp(Right(str, Len(strTail)), strTail, vbTextCompare) = 0 then
            dim offColon : offColon = InStr(1, str, ":")
            if offColon > 1 then
               VisualCPPCallback = Mid(str, offColon - 1, Len(str) - (offColon - 2) - Len(strTail))
            end if
         end if
      end if
   end if
end function


''
' Checks for a windows 10 SDK (later also WDK).
'
sub CheckForSDK10(strOptSDK10, strOptSDK10Version)
   dim strPathSDK10, strSDK10Version, str
   PrintHdr "Windows 10 SDK/WDK"
   '' @todo implement strOptSDK10Version

   '
   ' Try find the Windows 10 kit.
   '
   strSDK10Version = ""
   strPathSDK10 = CheckForSDK10Sub(strOptSDK10, strSDK10Version)
   if strPathSDK10 = "" and g_blnInternalFirst = true then
      strPathSDK10 = SearchTargetPlusTools("sdk", "v10.", GetRef("CheckForSDK10Sub"), strSDK10Version)
   end if

   if strPathSDK10 = "" then
      str = LogRegGetString("HKLM\SOFTWARE\Microsoft\Windows Kits\Installed Roots\KitsRoot10")
      strPathSDK10 = CheckForSDK10Sub(str, strSDK10Version)
   end if
   if strPathSDK10 = "" then
      for each str in g_arrProgramFiles
         strPathSDK10 = CheckForSDK10Sub(str & "/Windows Kits/10", strSDK10Version)
         if strPathSDK10 <> "" then exit for
      next
   end if
   if strPathSDK10 = "" and g_blnInternalFirst = true then
      strPathSDK10 = SearchTargetPlusTools("sdk", "v10.", GetRef("CheckForSDK10Sub"), strSDK10Version)
   end if

   if strPathSDK10 = "" then
      MsgError "Cannot find a suitable Windows 10 SDK.  Check configure.log and the build requirements."
      exit sub
   end if

   '
   ' Emit the config.
   '
   strPathSDK10 = UnixSlashes(PathAbs(strPathSDK10))
   CfgPrintAssign "PATH_SDK_WINSDK10", strPathSDK10
   CfgPrintAssign "SDK_WINSDK10_VERSION", strSDK10Version

   PrintResult "Windows 10 SDK", strPathSDK10
   PrintResultMsg "Windows 10 SDK version", strSDK10Version
   g_strPathSDK10 = strPathSDK10
end sub

'' Checks if the specified path points to a usable Windows 10 SDK/WDK.
function CheckForSDK10Sub(strPathSDK10, ByRef strSDK10Version)
   CheckForSDK10Sub = ""
   if strPathSDK10 <> "" then
      LogPrint "Trying: strPathSDK10=" & strPathSDK10
      if LogDirExists(strPathSDK10) then
         if   LogDirExists(strPathSDK10 & "/Bin") _
          and LogDirExists(strPathSDK10 & "/Include") _
          and LogDirExists(strPathSDK10 & "/Lib") _
          and LogDirExists(strPathSDK10 & "/Redist") _
         then
            ' Only testing the highest one, for now. '' @todo incorporate strOptSDK10Version
            dim arrVersions
            arrVersions = GetSubdirsStartingWithVerSorted(strPathSDK10 & "/Include", "10.0.")
            if UBound(arrVersions) >= 0 then
               dim strVersion
               strVersion = arrVersions(UBound(arrVersions))
               LogPrint "Trying version: " & strVersion
               if    LogFileExists(strPathSDK10, "include/" & strVersion & "/um/Windows.h") _
                and  LogFileExists(strPathSDK10, "include/" & strVersion & "/ucrt/malloc.h") _
                and  LogFileExists(strPathSDK10, "include/" & strVersion & "/ucrt/stdio.h") _
                and  LogFileExists(strPathSDK10, "lib/" & strVersion & "/um/"   & g_strTargetArchWin & "/kernel32.lib") _
                and  LogFileExists(strPathSDK10, "lib/" & strVersion & "/um/"   & g_strTargetArchWin & "/user32.lib") _
                and  LogFileExists(strPathSDK10, "lib/" & strVersion & "/ucrt/" & g_strTargetArchWin & "/libucrt.lib") _
                and  LogFileExists(strPathSDK10, "lib/" & strVersion & "/ucrt/" & g_strTargetArchWin & "/ucrt.lib") _
                and  LogFileExists(strPathSDK10, "bin/" & strVersion & "/" & g_strHostArchWin & "/rc.exe") _
                and  LogFileExists(strPathSDK10, "bin/" & strVersion & "/" & g_strHostArchWin & "/midl.exe") _
               then
                  if StrComp(strVersion, "10.0.17134.0") >= 0 then
                     strSDK10Version  = strVersion
                     CheckForSDK10Sub = strPathSDK10
                  else
                     LogPrint "Version " & strVersion & " is too low, minimum: 10.0.17134.0"
                  end if
               end if
            else
               LogPrint "Found no 10.0.* subdirectories under '" & strPathSDK10 & "/Include'!"
            end if
         end if
      end if
   end if
end function


''
' Locating a Windows 7 Driver Kit.
'
sub CheckForWinDDK(strOptDDK)
   dim strPathDDK, str, strSubKeys
   PrintHdr "Windows DDK v7.1"

   '
   ' Find the DDK.
   '
   strPathDDK = CheckForWinDDKSub(strOptDDK, True)

   ' The tools location (first).
   if strPathDDK = "" and g_blnInternalFirst = true then
      for each str in g_arrPathDev
         strPathDDK = CheckForWinDDKSub(str & "/win.x86/ddk/7600.16385.1", False)
         if strPathDDK <> "" then exit for
      next
   end if

   ' Check the environment
   if strPathDDK = "" then strPathDDK = CheckForWinDDKSub(PathParent(PathParent(EnvGet("DDK_INC_PATH"))), True)
   if strPathDDK = "" then strPathDDK = CheckForWinDDKSub(EnvGet("BASEDIR"), True)

   ' Some array constants to ease the work.
   arrSoftwareKeys = array("SOFTWARE", "SOFTWARE\Wow6432Node")
   arrRoots        = array("HKLM", "HKCU")

   ' Windows 7 WDK.
   if strPathDDK = "" then
      arrLocations = array()
      for each strSoftwareKey in arrSoftwareKeys
         for each strSubKey in RegEnumSubKeysFull("HKLM", strSoftwareKey & "\Microsoft\KitSetup\configured-kits")
            for each strSubKey2 in RegEnumSubKeysFull("HKLM", strSubKey)
               str = LogRegGetString("HKLM\" & strSubKey2 & "\setup-install-location")
               if str <> "" then
                  arrLocations = ArrayAppend(arrLocations, PathAbsLong(str))
               end if
            next
         next
      next
      arrLocations = ArrayRVerSortStrings(arrLocations)

      ' Check the locations we've gathered.
      for each str in arrLocations
         strPathDDK = CheckForWinDDKSub(str, True)
         if strPathDDK <> "" then exit for
      next
   end if

   ' The tools location (post).
   if strPathDDK = "" and g_blnInternalFirst = false then
      for each str in g_arrPathDev
         strPathDDK = CheckForWinDDKSub(str & "/win.x86/ddk/7600.16385.1", False)
         if strPathDDK <> "" then exit for
      next
   end if

   ' Give up.
   if strPathDDK = "" then
      MsgError "Cannot find the Windows DDK v7.1. Check configure.log and the build requirements."
      exit sub
   end if

   '
   ' Emit the config.
   '
   strPathDDK = UnixSlashes(PathAbs(strPathDDK))
   CfgPrintAssign "PATH_SDK_WINDDK71", strPathDDK

   PrintResult "Windows DDK v7.1", strPathDDK
   g_strPathDDK = strPathDDK
end sub

'' Quick check if the DDK is in the specified directory or not.
function CheckForWinDDKSub(strPathDDK, blnCheckBuild)
   CheckForWinDDKSub = ""
   if strPathDDK <> "" then
      dim strOutput
      LogPrint "Trying: strPathDDK=" & strPathDDK & " blnCheckBuild=" & blnCheckBuild
      if   LogFileExists(strPathDDK, "inc/api/ntdef.h") _
       And LogFileExists(strPathDDK, "lib/win7/i386/int64.lib") _
       And LogFileExists(strPathDDK, "lib/wlh/i386/int64.lib") _
       And LogFileExists(strPathDDK, "lib/wnet/i386/int64.lib") _
       And LogFileExists(strPathDDK, "lib/wxp/i386/int64.lib") _
       And Not LogFileExists(strPathDDK, "lib/win8/i386/int64.lib") _
       And LogFileExists(strPathDDK, "bin/x86/rc.exe") _
         then
         if Not blnCheckBuild then
            CheckForWinDDKSub = strPathDDK
         '' @todo Find better build check.
         elseif Shell("""" & DosSlashes(strPathDDK & "/bin/x86/rc.exe") & """" , True, strOutput) <> 0 _
            and InStr(1, strOutput, "Resource Compiler Version 6.1.") > 0 _
         then
            CheckForWinDDKSub = strPathDDK
         end if
      end if
   end if
end function


''
' Locating midl.exe
'
sub CheckForMidl(strOptMidl)
   dim strMidl, str
   PrintHdr "Midl.exe"

   ' Skip if no COM/ATL.
   if g_blnDisableCOM then
      PrintResultMsg "Midl.exe", "Skipped (" & g_strDisableCOM & ")"
      exit sub
   end if

   strMidl = CheckForMidlSub(strOptMidl)
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathSDK10 & "/bin/" & g_strHostArchWin & "/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathSDK10 & "/bin/x86/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathPSDK  & "/bin/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathVCC   & "/Common7/Tools/Bin/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathDDK   & "/bin/" & g_strHostArchWin & "/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathDDK   & "/bin/x86/Midl.exe")
   if strMidl = "" then strMidl = CheckForMidlSub(g_strPathDDK   & "/bin/Midl.exe")
   if strMidl = "" then
      for each str in g_arrPathDev
         strMidl = CheckForMidlSub(str & "/win." & g_strHostArchWin & "/bin/Midl.exe")
         if strMidl <> "" then exit for
         strMidl = CheckForMidlSub(str & "/win.x86/bin/Midl.exe")
         if strMidl <> "" then exit for
      next
   end if

   if strMidl = "" then
      PrintResultMsg "Midl.exe", "not found"
   else
      CfgPrintAssign "VBOX_MAIN_IDL", strMidl
      PrintResult "Midl.exe", strMidl
   end if
end sub

function CheckForMidlSub(strMidl)
   CheckForMidlSub = ""
   if strMidl <> "" then
      if LogFileExists1(strMidl) then
         CheckForMidlSub = UnixSlashes(PathAbs(strMidl))
      end if
   end if
end function


''
' Locating yasm.exe
'
sub CheckForYasm(strOptYasm)
   dim strPathYasm, strVersion
   PrintHdr "yasm"

   strVersion = ""
   strPathYasm = CheckForYasmSub(strOptYasm, strVersion)
   if strPathYasm = "" then strPathYasm = CheckForYasmSub(PathStripFilename(strOptYasm), strVersion)
   if strPathYasm = "" and g_blnInternalFirst = true then
      strPathYasm = SearchHostTools("yasm", "v", GetRef("CheckForYasmSub"), strVersion)
   end if
   if strPathYasm = "" then strPathYasm = CheckForYasmSub(PathStripFilename(Which("yasm.exe")), strVersion)
   if strPathYasm = "" and g_blnInternalFirst = false then
      strPathYasm = SearchHostTools("yasm", "v", GetRef("CheckForYasmSub"), strVersion)
   end if

   if strPathYasm = "" then
      PrintResultMsg "yasm", "not found"
      MsgError "Unable to locate yasm!"
   else
      CfgPrintAssign "PATH_TOOL_YASM", strPathYasm
      PrintResult "yasm v" & strVersion, strPathYasm
   end if
end sub

function CheckForYasmSub(strPathYasm, ByRef strVersion)
   CheckForYasmSub = ""
   if strPathYasm <> "" then
      if LogFileExists(strPathYasm, "yasm.exe") then
         dim strOutput
         if Shell("""" & DosSlashes(strPathYasm & "\yasm.exe") & """ --version", True, strOutput) = 0 then
            dim strPreamble : strPreamble = "yasm"
            dim strVer      : strVer      = Trim(StrGetFirstLine(strOutput))
            if StrComp(Left(strVer, Len(strPreamble)), strPreamble, vbTextCompare) = 0 then
               strVersion = StrGetFirstWord(Trim(Mid(strVer, Len(strPreamble) + 1)))
               if StrVersionCompare(strVersion, "1.3.0") >= 0 and strVersion <> "" then
                  LogPrint "Found yasm version: " & strVer
                  CheckForYasmSub = UnixSlashes(PathAbs(strPathYasm))
               else
                  LogPrint "yasm version is older than 1.3.0: " & strVersion
               end if
            else
               LogPrint "Not yasm: " & strVer
            end if
         end if
      end if
   end if
end function


''
' Locating nasm.exe
'
sub CheckForNasm(strOptNasm)
   dim strPathNasm, strVersion
   PrintHdr "nasm"

   strPathNasm = CheckForNasmSub(strOptNasm, strVersion)
   if strPathNasm = "" then strPathNasm = CheckForNasmSub(PathStripFilename(strOptNasm), strVersion)
   if strPathNasm = "" and g_blnInternalFirst = true then
      strPathNasm = SearchHostTools("nasm", "v", GetRef("CheckForNasmSub"), strVersion)
   end if
   if strPathNasm = "" then strPathNasm = CheckForNasmSub(LogRegGetString("HKLM\SOFTWARE\nasm\"), strVersion)
   if strPathNasm = "" then strPathNasm = CheckForNasmSub(LogRegGetString("HKCU\SOFTWARE\nasm\"), strVersion)
   if strPathNasm = "" then
      for each strCandidate in CollectFromProgramItemLinks(GetRef("NasmProgramItemCallback"), strPathNasm)
         strPathNasm = CheckForNasmSub(strCandidate, strVersion)
      next
   end if
   if strPathNasm = "" then strPathNasm = CheckForNasmSub(PathStripFilename(Which("nasm.exe")), strVersion)
   if strPathNasm = "" and g_blnInternalFirst = false then
      strPathNasm = SearchHostTools("nasm", "v", GetRef("CheckForNasmSub"), strVersion)
   end if

   if strPathNasm = "" then
      PrintResultMsg "nasm", "not found"
   else
      CfgPrintAssign "PATH_TOOL_NASM", strPathNasm
      PrintResult "nasm v" & strVersion, strPathNasm
   end if
end sub

function NasmProgramItemCallback(ByRef arrStrings, cStrings, ByRef strUnused)
   dim str, off
   NasmProgramItemCallback = ""
   if cStrings > 1 then
      str = arrStrings(1)
      off = InStr(1, str, "\nasm.exe", vbTextCompare)
      if off > 0 then
         NasmProgramItemCallback = Left(str, off - 1)
      end if
   end if
end function

function CheckForNasmSub(strPathNasm, ByRef strVersion)
   CheckForNasmSub = ""
   if strPathNasm <> "" then
      if LogFileExists(strPathNasm, "nasm.exe") then
         dim strOutput
         if Shell("""" & DosSlashes(strPathNasm & "\nasm.exe") & """ -version", True, strOutput) = 0 then
            dim strPreamble : strPreamble = "NASM version"
            dim strVer      : strVer      = Trim(StrGetFirstLine(strOutput))
            if StrComp(Left(strVer, Len(strPreamble)), strPreamble, vbTextCompare) = 0 then
               strVersion = StrGetFirstWord(Trim(Mid(strVer, Len(strPreamble) + 1)))
               if StrVersionCompare(strVersion, "2.12.0") >= 0 and strVersion <> "" then
                  LogPrint "Found nasm version: " & strVersion
                  CheckForNasmSub = UnixSlashes(PathAbs(strPathNasm))
               else
                  LogPrint "nasm version is older than 2.12.0: " & strVersion
               end if
            else
               LogPrint "Not nasm: " & strVer
            end if
         end if
      end if
   end if
end function


''
' Locating OpenWatcom 1.9
'
sub CheckForOpenWatcom(strOptOpenWatcom)
   dim strPathOW, strCandidate, strVersion
   PrintHdr "OpenWatcom"

   strPathOW = CheckForOpenWatcomSub(strOptOpenWatcom, strVersion)
   if strPathOW = "" and g_blnInternalFirst = true then
      strPathOW = SearchCommonTools("openwatcom", "v", GetRef("CheckForOpenWatcomSub"), strVersion)
   end if
   if strPathOW = "" then
      for each strCandidate in CollectFromProgramItemLinks(GetRef("OpenWatcomProgramItemCallback"), strPathOW)
         if strPathOW = "" then strPathOW = CheckForOpenWatcomSub(strCandidate, strVersion)
      next
   end if
   if strPathOW = "" then strPathOW = CheckForOpenWatcomSub(EnvGet("WATCOM"), strVersion)
   if strPathOW = "" then strPathOW = CheckForOpenWatcomSub(PathParent(PathStripFilename(Which("wcc386.exe"))), strVersion)
   if strPathOW = "" and g_blnInternalFirst = false then
      strPathOW = SearchCommonTools("openwatcom", "v", GetRef("CheckForOpenWatcomSub"), strVersion)
   end if

   if strPathOW = "" then
      PrintResultMsg "OpenWatcom", "not found"
      CfgPrintAssign "VBOX_WITH_OPEN_WATCOM", ""
      exit sub
   end if

   CfgPrintAssign "VBOX_WITH_OPEN_WATCOM", "1"
   CfgPrintAssign "PATH_TOOL_OPENWATCOM", strPathOW
   PrintResult "OpenWatcom v" & strVersion, strPathOW
   if StrVersionCompare(strVersion, "2.0") >= 0 then
      MsgWarning "We only test building with OpenWatcom 1.9."
   end if
end sub

function OpenWatcomProgramItemCallback(ByRef arrStrings, cStrings, ByRef strUnused)
   dim str, off
   OpenWatcomProgramItemCallback = ""
   if cStrings > 1 then
      str = arrStrings(1)
      off = InStr(1, str, "\binnt\", vbTextCompare)
      if off > 0 then
         OpenWatcomProgramItemCallback = Left(str, off - 1)
      end if
   end if
end function

function CheckForOpenWatcomSub(strPathOW, ByRef strVersion)
   CheckForOpenWatcomSub = ""
   if strPathOW <> "" then
      LogPrint "Trying: " & strPathOW
      if LogDirExists(strPathOW) then
         if   LogDirExists(strPathOW & "/binnt") _
          and LogDirExists(strPathOW & "/h") _
          and LogDirExists(strPathOW & "/eddat") _
          and LogFileExists(strPathOW, "binnt/wcc386.exe") _
          and LogFileExists(strPathOW, "binnt/wcc.exe") _
          and LogFileExists(strPathOW, "binnt/wlink.exe") _
          and LogFileExists(strPathOW, "binnt/wcl386.exe") _
          and LogFileExists(strPathOW, "binnt/wcl.exe") _
          and LogFileExists(strPathOW, "binnt/wlib.exe") _
          and LogFileExists(strPathOW, "binnt/wasm.exe") _
          and LogFileExists(strPathOW, "h/stdarg.h") _
         then
            ' Some wcl/wcl386 option parsing quirk allows us to specify /whatever
            ' and just get the logo text and exit code 0.  We use /y as it's a valid option.
            dim strOutput
            if Shell("""" & DosSlashes(strPathOW & "\binnt\wcl.exe") & """ /y", True, strOutput) = 0 then
               dim strPreamble : strPreamble = "Open Watcom C/C++16 Compile and Link Utility Version"
               strOutput = StrGetFirstLine(strOutput)
               if StrStartsWithI(strOutput, strPreamble) then
                  strVersion = StrGetFirstWord(Trim(Mid(strOutput, Len(strPreamble) + 1)))
                  if StrVersionCompare(strVersion, "1.9") >= 0 then
                     CheckForOpenWatcomSub = UnixSlashes(PathAbs(strPathOW))
                  else
                     LogPrint "OpenWatcom version id older than 1.9: " & strVersion
                  end if
               else
                  LogPrint "Not OpenWatcom: " & strOutput
               end if
            end if
         end if
      end if
   end if
end function


''
' Checks for any libSDL binaries.
'
sub CheckForlibSDL(strOptlibSDL)
   dim strPathLibSDL, strVersion
   PrintHdr "libSDL"

   '
   ' Try find some SDL library.
   '
   strPathLibSDL = CheckForLibSDLSub(strOptlibSDL, strVersion)
   if strPathlibSDL = "" and g_blnInternalFirst = true then
      strPathLibSDL = SearchTargetTools("libsdl", "v", GetRef("CheckForLibSDLSub"), strVersion)
   end if

   ' Poke about in the LIB and PATH env.vars.
   if strPathlibSDL = "" then strPathLibSDL = CheckForlibSDLSub(PathParent(PathStripFilename(WhichEx("LIB", "SDLmain.lib"))), strVersion)
   if strPathlibSDL = "" then strPathLibSDL = CheckForlibSDLSub(PathParent(PathStripFilename(Which("..\lib\SDLmain.lib"))), strVersion)
   if strPathlibSDL = "" then strPathLibSDL = CheckForlibSDLSub(PathParent(PathStripFilename(Which("SDLmain.lib"))), strVersion)
   if strPathlibSDL = "" then strPathLibSDL = CheckForlibSDLSub(PathParent(PathStripFilename(Which("SDL.dll"))), strVersion)

   ' The tools again.
   if strPathlibSDL = "" and g_blnInternalFirst = false then
      strPathLibSDL = SearchTargetTools("libsdl", "v", GetRef("CheckForLibSDLSub"), strVersion)
   end if

   ' Success?
   if strPathlibSDL = "" then
      if strOptlibSDL = "" then
         MsgError "Can't locate libSDL. Try specify the path with the --with-libSDL=<path> argument. " _
                & "If still no luck, consult the configure.log and the build requirements."
      else
         MsgError "Can't locate libSDL. Please consult the configure.log and the build requirements."
      end if
      exit sub
   end if

   strPathLibSDL = UnixSlashes(PathAbs(strPathLibSDL))
   CfgPrintAssign "PATH_SDK_LIBSDL", strPathlibSDL

   PrintResult "libSDL", strPathlibSDL
end sub

'' Checks if the specified path points to an usable libSDL or not.
function CheckForLibSDLSub(strPathlibSDL, strVersion)
   CheckForlibSDLSub = ""
   if strPathLibSDL <> "" then
      LogPrint "Trying: strPathLibSDL=" & strPathLibSDL
      if   LogFileExists(strPathLibSDL, "lib/SDL.lib") _
       and LogFileExists(strPathLibSDL, "lib/SDLmain.lib") _
       and LogFileExists(strPathLibSDL, "lib/SDL.dll") _
      then
         dim strIncSub : strIncSub = "include"
         if DirExists(strPathlibSDL & "/include/SDL") then strIncSub = "include/SDL"
         if   LogFileExists(strPathLibSDL, strIncSub & "/SDL.h") _
          and LogFileExists(strPathLibSDL, strIncSub & "/SDL_syswm.h") _
          and LogFileExists(strPathLibSDL, strIncSub & "/SDL_version.h") _
         then
            strVersion = ""
            CheckForLibSDLSub = strPathLibSDL
         end if
      end if
   end if
end function


''
' Checks for libxml2.
'
sub CheckForXml2(strOptXml2)
   dim strPathXml2, str
   PrintHdr "libxml2"

   '
   ' Part of tarball / svn, so we can exit immediately if no path was specified.
   '
   if (strOptXml2 = "") then
      PrintResultMsg "libxml2", "src/lib/libxml2-*"
      exit sub
   end if

   ' Skip if no COM/ATL.
   if g_blnDisableCOM then
      PrintResultMsg "libxml2", "Skipped (" & g_strDisableCOM & ")"
      exit sub
   end if

   '
   ' Try find some xml2 dll/lib.
   '
   strPathXml2 = ""
   if (strPathXml2 = "") And (strOptXml2 <> "") then
      if CheckForXml2Sub(strOptXml2) then strPathXml2 = strOptXml2
   end if

   if strPathXml2 = "" then
      str = Which("libxml2.lib")
      if str <> "" then
         str = PathParent(PathStripFilename(str))
         if CheckForXml2Sub(str) then strPathXml2 = str
      end if
   end if

   ' Success?
   if strPathXml2 = "" then
      if strOptXml2 = "" then
         MsgError "Can't locate libxml2. Try specify the path with the --with-libxml2=<path> argument. " _
                & "If still no luck, consult the configure.log and the build requirements."
      else
         MsgError "Can't locate libxml2. Please consult the configure.log and the build requirements."
      end if
      exit sub
   end if

   strPathXml2 = UnixSlashes(PathAbs(strPathXml2))
   CfgPrintAssign "SDK_VBoxLibXml2_DEFS", "_REENTRANT"
   CfgPrintAssign "SDK_VBoxLibXml2_INCS", strPathXml2 & "/include"
   CfgPrintAssign "SDK_VBoxLibXml2_LIBS", strPathXml2 & "/lib/libxml2.lib"

   PrintResult "libxml2", strPathXml2
end sub

'' Checks if the specified path points to an usable libxml2 or not.
function CheckForXml2Sub(strPathXml2)
   dim str

   CheckForXml2Sub = False
   LogPrint "trying: strPathXml2=" & strPathXml2
   if   LogFileExists(strPathXml2, "include/libxml/xmlexports.h") _
    And LogFileExists(strPathXml2, "include/libxml/xmlreader.h") _
      then
      str = LogFindFile(strPathXml2, "bin/libxml2.dll")
      if str <> "" then
         if LogFindFile(strPathXml2, "lib/libxml2.lib") <> "" then
            CheckForXml2Sub = True
         end if
      end if
   end if
end function


'' Checks for openssl
sub CheckForSsl(strOptSsl, bln32Bit)
   dim strPathSsl, str
   PrintHdr "openssl"

   strOpenssl = "openssl"
   if bln32Bit = True then
       strOpenssl = "openssl32"
   end if

   '
   ' Part of tarball / svn, so we can exit immediately if no path was specified.
   '
   if (strOptSsl = "") then
      PrintResult strOpenssl, "src/libs/openssl-*"
      exit sub
   end if

   '
   ' Try find some openssl dll/lib.
   '
   strPathSsl = ""
   if (strPathSsl = "") And (strOptSsl <> "") then
      if CheckForSslSub(strOptSsl) then strPathSsl = strOptSsl
   end if

   if strPathSsl = "" then
      str = Which("libssl.lib")
      if str <> "" then
         str = PathParent(PathStripFilename(str))
         if CheckForSslSub(str) then strPathSsl = str
      end if
   end if

   ' Success?
   if strPathSsl = "" then
      if strOptSsl = "" then
         MsgError "Can't locate " & strOpenssl & ". " _
                & "Try specify the path with the --with-" & strOpenssl & "=<path> argument. " _
                & "If still no luck, consult the configure.log and the build requirements."
      else
         MsgError "Can't locate " & strOpenssl & ". " _
                & "Please consult the configure.log and the build requirements."
      end if
      exit sub
   end if

   strPathSsl = UnixSlashes(PathAbs(strPathSsl))
   if bln32Bit = True then
      CfgPrintAssign "SDK_VBoxOpenSslStatic-x86_INCS",     strPathSsl & "/include"
      CfgPrintAssign "SDK_VBoxOpenSslStatic-x86_LIBS",     strPathSsl & "/lib/libcrypto.lib" & " " & strPathSsl & "/lib/libssl.lib"
      CfgPrintAssign "SDK_VBoxOpenSslBldProg-x86_LIBS", strPathSsl & "/lib/libcrypto.lib" & " " & strPathSsl & "/lib/libssl.lib"
   else
      CfgPrintAssign "SDK_VBoxOpenSslStatic_INCS",         strPathSsl & "/include"
      CfgPrintAssign "SDK_VBoxOpenSslStatic_LIBS",         strPathSsl & "/lib/libcrypto.lib" & " " & strPathSsl & "/lib/libssl.lib"
      CfgPrintAssign "SDK_VBoxOpenSslBldProg_LIBS",     strPathSsl & "/lib/libcrypto.lib" & " " & strPathSsl & "/lib/libssl.lib"
   end if

   PrintResult strOpenssl, strPathSsl
end sub

'' Checks if the specified path points to an usable openssl or not.
function CheckForSslSub(strPathSsl)

   CheckForSslSub = False
   LogPrint "trying: strPathSsl=" & strPathSsl
   if   LogFileExists(strPathSsl, "include/openssl/md5.h") _
    And LogFindFile(strPathSsl, "lib/libssl.lib") <> "" _
      then
         CheckForSslSub = True
      end if
end function


''
' Checks for libcurl
'
sub CheckForCurl(strOptCurl, bln32Bit)
   dim strPathCurl, str
   PrintHdr "libcurl"

   strCurl = "libcurl"
   if bln32Bit = True then
       strCurl = "libcurl32"
   end if

   '
   ' Part of tarball / svn, so we can exit immediately if no path was specified.
   '
   if (strOptCurl = "") then
      PrintResult strCurl, "src/libs/curl-*"
      exit sub
   end if

   '
   ' Try find some cURL dll/lib.
   '
   strPathCurl = ""
   if (strPathCurl = "") And (strOptCurl <> "") then
      if CheckForCurlSub(strOptCurl) then strPathCurl = strOptCurl
   end if

   if strPathCurl = "" then
      str = Which("libcurl.lib")
      if str <> "" then
         str = PathParent(PathStripFilename(str))
         if CheckForCurlSub(str) then strPathCurl = str
      end if
   end if

   ' Success?
   if strPathCurl = "" then
      if strOptCurl = "" then
         MsgError "Can't locate " & strCurl & ". " _
                & "Try specify the path with the --with-" & strCurl & "=<path> argument. " _
                & "If still no luck, consult the configure.log and the build requirements."
      else
         MsgError "Can't locate " & strCurl & ". " _
                & "Please consult the configure.log and the build requirements."
      end if
      exit sub
   end if

   strPathCurl = UnixSlashes(PathAbs(strPathCurl))
   if bln32Bit = True then
      CfgPrintAssign "SDK_VBoxLibCurl-x86_INCS",     strPathCurl & "/include"
      CfgPrintAssign "SDK_VBoxLibCurl-x86_LIBS.x86", strPathCurl & "/libcurl.lib"
   else
      CfgPrintAssign "SDK_VBoxLibCurl_INCS", strPathCurl & "/include"
      CfgPrintAssign "SDK_VBoxLibCurl_LIBS", strPathCurl & "/libcurl.lib"
   end if

   PrintResult strCurl, strPathCurl
end sub

'' Checks if the specified path points to an usable libcurl or not.
function CheckForCurlSub(strPathCurl)

   CheckForCurlSub = False
   LogPrint "trying: strPathCurl=" & strPathCurl
   if   LogFileExists(strPathCurl, "include/curl/curl.h") _
    And LogFindFile(strPathCurl, "libcurl.dll") <> "" _
    And LogFindFile(strPathCurl, "libcurl.lib") <> "" _
      then
         CheckForCurlSub = True
      end if
end function


''
' Checks for any Qt binaries.
'
sub CheckForQt(strOptQt, strOptInfix)
   dim strPathQt, strInfixQt, arrFolders, arrVccInfixes, strVccInfix, strPathDev
   PrintHdr "Qt"

   '
   ' Try to find the Qt installation (user specified path with --with-qt)
   '
   LogPrint "Checking for user specified path of Qt ... "
   strPathQt = CheckForQtSub(UnixSlashes(strOptQt), strOptInfix, strInfixQt)
   if strPathQt = "" and g_blnInternalFirst = true then strPathQt = CheckForQtInternal(strOptInfix, strInfixQt)
   if strPathQt = "" then
      '
      ' Collect links from "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\UFH\SHC"
      '
      ' Typical string list:
      '   C:\Users\someuser\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Qt\6.x.y\MSVC 20zz (64-bit)\Qt 6.x.y (MSVC 20zz 64-bit).lnk
      '   C:\Windows\System32\cmd.exe
      '   /A /Q /K E:\qt\installed\6.x.y\msvc20zz_64\bin\qtenv2.bat
      '
      dim arrCandidates, strCandidate
      arrCandidates = CollectFromProgramItemLinks(GetRef("QtProgramItemCallback"), strPathQt)
      LogPrint "Testing qtenv2.bat links (" & ArraySize(arrCandidates) & ") ..."

      ' VC infixes/subdir names to consider (ASSUMES 64bit)
      if     g_strVCCVersion = "VCC142" or g_strVCCVersion = "" then
         arrVccInfixes = Array("msvc2019_64", "msvc2017_64", "msvc2015_64")
      else
         MsgFatal "Unexpected VC version: " & g_strVCCVersion
         arrVccInfixes = Array()
      end if
      for each strVccInfix in arrVccInfixes
         for each strCandidate in arrCandidates
            if InStr(1, LCase(strCandidate), strVccInfix) > 0 then
               strPathQt = CheckForQtSub(strCandidate, strOptInfix, strInfixQt)
               if strPathQt <> "" then exit for
            end if
         next
         if strPathQt <> "" then exit for
      next
   end if

   ' Check the dev tools - prefer ones matching the compiler.
   if strPathQt = "" and g_blnInternalFirst = false then strPathQt = CheckForQtInternal(strOptInfix, strInfixQt)

   '
   ' Display the result and output the config.
   '
   if strPathQt <> "" then
      PrintResult "Qt", strPathQt
      PrintResultMsg "Qt infix", strInfixQt
      CfgPrintAssign "PATH_SDK_QT6",          strPathQt
      CfgPrintAssign "PATH_TOOL_QT6",         "$(PATH_SDK_QT6)"
      CfgPrintAssign "VBOX_PATH_QT",          "$(PATH_SDK_QT6)"
      CfgPrintAssign "VBOX_QT_INFIX",         strInfixQt
      CfgPrintAssign "VBOX_WITH_QT_PAYLOAD",  "1"
   else
      PrintResultMsg "Qt", "not found"
      CfgPrintAssign "VBOX_WITH_QTGUI", ""
   end if
end sub

function CheckForQtInternal(strOptInfix, ByRef strInfixQt)
   dim strPathDev, arrFolders, arrVccInfixes, strVccInfix, i
   CheckForQtInternal = ""
   for each strPathDev in g_arrPathDev
      LogPrint "Testing tools dir (" & strPathDev & "/win." & g_strTargetArch & "/qt/v6*) ..."
      arrFolders = GetSubdirsStartingWithVerSorted(strPathDev & "/win." & g_strTargetArch & "/qt", "v6")
      arrVccInfixes = Array(LCase(g_strVCCVersion), Left(LCase(g_strVCCVersion), Len(g_strVCCVersion) - 1), "")
      for each strVccInfix in arrVccInfixes
         for i = UBound(arrFolders) to LBound(arrFolders) step -1
            if strVccInfix = "" or InStr(1, LCase(arrFolders(i)), strVccInfix) > 0 then
LogPrint "i="&i&" strVccInfix="&strVccInfix
               strPathQt = CheckForQtSub(strPathDev & "/win." & g_strTargetArch & "/qt/" & arrFolders(i), strOptInfix, strInfixQt)
               if strPathQt <> "" then
                  CheckForQtInternal = strPathQt
                  exit function
               end if
            end if
         next
      next
   next
end function

function QtProgramItemCallback(ByRef arrStrings, cStrings, ByRef strUnused)
   dim str, off
   QtProgramItemCallback = ""
   if cStrings >= 3 then
      str = Trim(arrStrings(UBound(arrStrings)))
      if   LCase(Right(str, Len("\bin\qtenv2.bat"))) = "\bin\qtenv2.bat" _
       and InStr(1, LCase(str), "\msvc20") > 0 _
       and InStr(1, str, ":") > 0 _
      then
         off = InStr(1, str, ":") - 1
         QtProgramItemCallback = Mid(str, off, Len(str) - off - Len("\bin\qtenv2.bat") + 1)
      end if
   end if
end function

function CheckForQtSub(strPathQt, strOptInfix, ByRef strInfixQt)
   CheckForQtSub = ""
   if strPathQt <> "" then
      LogPrint "Trying: strPathQt=" & strPathQt

      if   LogFileExists(strPathQt, "bin/moc.exe") _
       and LogFileExists(strPathQt, "bin/uic.exe") _
       and LogFileExists(strPathQt, "include/QtWidgets/qwidget.h") _
       and LogFileExists(strPathQt, "include/QtWidgets/QApplication") _
       and LogFileExists(strPathQt, "include/QtGui/QImage") _
       and LogFileExists(strPathQt, "include/QtNetwork/QHostAddress") _
      then
         ' Infix testing.
         if   LogFileExists(strPathQt, "lib/Qt6Core.lib") _
          and LogFileExists(strPathQt, "lib/Qt6Network.lib") then
            LogPrint "found it w/o infix"
            strInfixQt = ""
            CheckForQtSub = UnixSlashes(PathAbs(strPathQt))
         elseif LogFileExists(strPathQt, "lib/Qt6Core" & strOptInfix & ".lib") _
            and LogFileExists(strPathQt, "lib/Qt6Network" & strOptInfix & ".lib") then
            LogPrint "found it w/ infix: " & strOptInfix & " (option)"
            strInfixQt = strOptInfix
            CheckForQtSub = UnixSlashes(PathAbs(strPathQt))
         elseif LogFileExists(strPathQt, "lib/Qt6CoreVBox.lib") _
            and LogFileExists(strPathQt, "lib/Qt6NetworkVBox.lib") then
            LogPrint "found it w/ infix: VBox"
            strInfixQt = "VBox"
            CheckForQtSub = UnixSlashes(PathAbs(strPathQt))
         end if
      end if
   end if
end function


''
' Checks for python.
'
function CheckForPython(strOptPython)
   dim strPathPython, arrVersions, strVer, str
   PrintHdr "Python"
   CheckForPython = False

   '
   ' Locate it.
   '
   strPathPython = CheckForPythonSub(strOptPython)
   if strPathPython = "" then
      arrVersions = Array("3.12", "3.11", "3.10", "3.9", "3.8", "3.7", "3.6", "3.5", "2.7")
      for each strVer in arrVersions
         strPathPython = CheckForPythonSub(LogRegGetString("HKLM\SOFTWARE\Python\PythonCore\" & strVer & "\InstallPath\"))
         if strPathPython <> "" then exit for
      next
   end if
   if strPathPython = "" then strPathPython = CheckForPythonSub(PathStripFilename(Which("python.exe")))

   '
   ' Output config & result.
   '
   CheckForPython = strPathPython <> ""
   if CheckForPython then
      CfgPrintAssign "VBOX_BLD_PYTHON", strPathPython
      PrintResult "Python", strPathPython
   else
      PrintResultMsg "Python", "not found"
   end if
end function

function CheckForPythonSub(strPathPython)
   CheckForPythonSub = ""
   if strPathPython <> "" then
      if   LogFileExists(strPathPython, "python.exe") _
      then
         CheckForPythonSub = UnixSlashes(PathAbs(strPathPython & "/python.exe"))
      end if
   end if
end function


''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'  Main function and usage                                                                                                       '
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

''
' Show usage.
'
sub usage
   Print "Usage: cscript configure.vbs [options]"
   Print ""
   Print "Configuration:"
   Print "  -h, --help              Display this."
   Print "  --target-arch=x86|amd64 The target architecture."
   Print "  --continue-on-error     Do not stop on errors."
   Print "  --internal-last         Check internal tools (tools/win.*) last."
   Print "  --internal-first        Check internal tools (tools/win.*) first (default)."
   Print ""
   Print "Components:"
   Print "  --disable-COM           Disables all frontends and API."
   Print "  --disable-SDL           Disables the SDL frontend."
   Print "  --disable-UDPTunnel"
   Print "  --disable-pylint        Disable use of pylint."
   Print ""
   Print "Locations:"
   Print "  --with-kBuild=PATH      Where kBuild is to be found."
   Print "  --with-libSDL=PATH      Where libSDL is to be found."
   Print "  --with-Qt=PATH          Where Qt is to be found (optional)."
   Print "  --with-DDK=PATH         Where the WDK is to be found."
   Print "  --with-SDK=PATH         Where the Windows SDK is to be found."
   Print "  --with-SDK10=PATH       Where the Windows 10 SDK/WDK is to be found."
   Print "  --with-VC=PATH          Where the Visual C++ compiler is to be found."
   Print "                          (Expecting bin, include and lib subdirs.)"
   Print "  --with-VC-Common=PATH   Maybe needed for 2015 and older to"
   Print "                          locate the Common7 directory."
   Print "  --with-python=PATH      The python to use."
   Print "  --with-midl=PATH        Where midl.exe is to be found."
   Print "  --with-yasm=PATH        Where YASM is to be found."
   Print "  --with-nasm=PATH        Where NASM is to be found (optional)"
   Print "  --with-openwatcom=PATH  Where OpenWatcom 1.9 is to be found (optional)."
   Print "  --with-libxml2=PATH     To use a libxml2 other than the VBox one (opt)."
   Print "  --with-openssl=PATH     To use an openssl other than the VBox one (opt)."
   Print "  --with-openssl32=PATH   The 32-bit variant of openssl (optional)."
   Print "  --with-libcurl=PATH     To use a cURL other than the VBox one (optional)."
   Print "  --with-libcurl32=PATH   The 32-bit variant of cURL (optional)."
   Print ""
   Print "  --append-tools-dir=PATH, --prepend-tools-dir=PATH"
   Print "                          Adds an alternative tools directory to search."
   Print "  --append-tools-dir=PATH, --prepend-prog-files=PATH"
   Print "                          Adds an alternative Program Files dir to search."
   Print "  --append-ewdk-drive=DRIVE, --prepend-ewdk-drive=DRIVE"
   Print "                          Adds an EWDK drive the search list."
end sub


''
' The main() like function.
'
function Main
   dim strOutput

   '
   ' Write the log header and check that we're not using wscript.
   '
   LogInit
   if UCase(Right(Wscript.FullName, 11)) = "WSCRIPT.EXE" then
      Wscript.Echo "This script must be run under CScript."
      Main = 1
      exit function
   end if
   SelfTest

   '
   ' Parse arguments.
   '
   strOptDDK = ""
   strOptkBuild = ""
   strOptlibSDL = ""
   strOptQt = ""
   strOptQtInfix = ""
   strOptSDK10 = ""
   strOptSDK10Version = ""
   strOptVC = ""
   strOptVCCommon = ""
   strOptMidl = ""
   strOptYasm = ""
   strOptNasm = ""
   strOptOpenWatcom = ""
   strOptXml2 = ""
   strOptSsl = ""
   strOptSsl32 = ""
   strOptCurl = ""
   strOptCurl32 = ""
   strOptPython = ""
   blnOptDisableCOM = False
   blnOptDisableUDPTunnel = False
   blnOptDisableSDL = False
   for i = 1 to Wscript.Arguments.Count
      dim str, strArg, strPath

      ' Separate argument and path value
      str = Wscript.Arguments.item(i - 1)
      if InStr(1, str, "=") > 0 then
         strArg = Mid(str, 1, InStr(1, str, "=") - 1)
         strPath = Mid(str, InStr(1, str, "=") + 1)
         if strPath = "" then MsgFatal "Syntax error! Argument #" & i & " is missing the path."
      else
         strArg = str
         strPath = ""
      end if

      ' Process the argument
      select case LCase(strArg)
         ' --with-something:
         case "--with-ddk"
            strOptDDK = strPath
         case "--with-dxsdk"
            MsgWarning "Ignoring --with-dxsdk (the DirectX SDK is no longer required)."
         case "--with-kbuild"
            strOptkBuild = strPath
         case "--with-libsdl"
            strOptlibSDL = strPath
         case "--with-mingw32"
            ' ignore
         case "--with-mingw-w64"
            ' ignore
         case "--with-qt"
            strOptQt = strPath
         case "--with-qt-infix"
            strOptQtInfix = strPath
         case "--with-sdk"
            MsgWarning "Ignoring --with-sdk (the legacy Platform SDK is no longer required)."
         case "--with-sdk10"
            strOptSDK10 = strPath
         case "--with-sdk10-version"
            strOptSDK10Version = strPath
         case "--with-vc"
            strOptVC = strPath
         case "--with-vc-common"
            strOptVCCommon = strPath
         case "--with-vc-express-edition"
            ' ignore
         case "--with-w32api"
            ' ignore
         case "--with-midl"
            strOptMidl = strPath
         case "--with-yasm"
            strOptYasm = strPath
         case "--with-nasm"
            strOptNasm = strPath
         case "--with-openwatcom"
            strOptOpenWatcom = strPath
         case "--with-libxml2"
            strOptXml2 = strPath
         case "--with-openssl"
            strOptSsl = strPath
         case "--with-openssl32"
            strOptSsl32 = strPath
         case "--with-libcurl"
            strOptCurl = strPath
         case "--with-libcurl32"
            strOptCurl32 = strPath
         case "--with-python"
            strOptPython = strPath

         ' Search lists.
         case "--append-tools-dir"
            g_arrToolsDirs    = ArrayAppend(g_arrPathDev, strPath)
         case "--prepend-tools-dir"
            g_arrToolsDirs    = ArrayPrepend(g_arrPathDev, strPath)
         case "--append-prog-files"
            g_arrProgramFiles = ArrayAppend(g_arrProgramFiles, strPath)
         case "--prepend-prog-files"
            g_arrProgramFiles = ArrayPrepend(g_arrProgramFiles, strPath)
         case "--append-ewdk-drive"
            g_arrProgramFiles = ArrayAppend(g_arrProgramFiles, strPath & "\Program Files")
         case "--prepend-ewdk-drive"
            g_arrProgramFiles = ArrayPrepend(g_arrProgramFiles, strPath & "\Program Files")

         ' --disable-something/--enable-something
         case "--disable-com"
            blnOptDisableCOM = True
         case "--enable-com"
            blnOptDisableCOM = False
         case "--disable-udptunnel"
            blnOptDisableUDPTunnel = True
         case "--enable-udptunnel"
            blnOptDisableUDPTunnel = False
         case "--disable-sdl"
            blnOptDisableSDL = True
         case "--endable-sdl"
            blnOptDisableSDL = False
         case "--disable-pylint"
            blnOptDisablePylint = True
         case "--enable-pylint"
            blnOptDisablePylint = False

         ' Other stuff.
         case "--continue-on-error"
            g_blnContinueOnError = True
         case "--internal-first"
            g_blnInternalFirst = True
         case "--internal-last"
            g_blnInternalFirst = False
         case "--target-arch"
            g_strTargetArch = strPath
         case "-h", "--help", "-?"
            usage
            Main = 0
            exit function
         case else
            Wscript.echo "syntax error: Unknown option '" & str &"'."
            usage
            Main = 2
            exit function
      end select
   next

   '
   ' Initialize output files.
   '
   CfgInit
   EnvInit

   '
   ' Check that the Shell function is sane.
   '
   g_objShell.Environment("PROCESS")("TESTING_ENVIRONMENT_INHERITANCE") = "This works"
   if Shell("set TESTING_ENVIRONMENT_INHERITANC", False, strOutput) <> 0 then ' The 'E' is missing on purpose (4nt).
      MsgFatal "shell execution test failed!"
   end if
   if strOutput <> "TESTING_ENVIRONMENT_INHERITANCE=This works" & CHR(13) & CHR(10)  then
      Print "Shell test Test -> '" & strOutput & "'"
      MsgFatal "shell inheritance or shell execution isn't working right. Make sure you use cmd.exe."
   end if
   g_objShell.Environment("PROCESS")("TESTING_ENVIRONMENT_INHERITANCE") = ""
   Print "Shell inheritance test: OK"

   '
   ' Do the checks.
   '
   if blnOptDisableCOM = True then
      DisableCOM        "--disable-com"
   end if
   if blnOptDisableUDPTunnel = True then
      DisableUDPTunnel  "--disable-udptunnel"
   end if
   if blnOptDisablePylint = True then
      CfgPrintAssign "override VBOX_WITH_PYLINT", ""
   end if
   CheckSourcePath
   CheckForkBuild       strOptkBuild
   CheckForWinDDK       strOptDDK
   CheckForVisualCPP    strOptVC, strOptVCCommon
   CheckForSDK10        strOptSDK10, strOptSDK10Version
   CheckForMidl         strOptMidl
   CheckForYasm         strOptYasm
   CheckForNasm         strOptNasm
   CheckForOpenWatcom   strOptOpenWatcom
   if blnOptDisableSDL = True then
      DisableSDL "--disable-sdl"
   else
      CheckForlibSDL    strOptlibSDL
   end if
   CheckForXml2         strOptXml2
   CheckForSsl          strOptSsl, False
   if g_strTargetArch = "amd64" then
       ' 32-bit openssl required as well
      CheckForSsl       strOptSsl32, True
   end if
   CheckForCurl         strOptCurl, False
   if g_strTargetArch = "amd64" then
       ' 32-bit Curl required as well
      CheckForCurl      strOptCurl32, True
   end if
   CheckForQt           strOptQt, strOptQtInfix
   CheckForPython       strOptPython
   CfgPrintAssign "VBOX_WITH_LIBVPX",    "" '' @todo look for libvpx 1.1.0+
   CfgPrintAssign "VBOX_WITH_LIBOGG",    "" '' @todo look for libogg 1.3.5+
   CfgPrintAssign "VBOX_WITH_LIBVORBIS", "" '' @todo look for libvorbis 1.3.7+

   EnvPrintAppend "PATH", DosSlashes(g_strPath & "\tools\win." & g_strHostArch & "\bin"), ";"
   if g_strHostArch = "amd64" then
      EnvPrintAppend "PATH", DosSlashes(g_strPath & "\tools\win.x86\bin"), ";"
   else
      EnvPrintCleanup "PATH", DosSlashes(g_strPath & "\tools\win.amd64\bin"), ";"
   end if

   Print ""
   Print "Execute env.bat once before you start to build VBox:"
   Print ""
   Print "  env.bat"
   Print "  kmk"
   Print ""
   if g_rcScript <> 0 then
      Print "Warning: ignored errors. See above or in configure.log."
   end if

   Main = g_rcScript
end function

'
' What crt0.o typically does:
'
WScript.Quit(Main())