# Copyright (C) 1992-2019, 2020 Free Software Foundation, Inc.
#
# This file is part of DejaGnu.
#
# DejaGnu 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; either version 3 of the License, or
# (at your option) any later version.
#
# DejaGnu 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 DejaGnu; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.

# This file was written by Rob Savoye <rob@welcomehome.org>.

# this contains a list of gcc options and their respective directories.

# Find the pieces of libgloss for testing the GNU development tools
# needed to link a set of object files into an executable.
# This usually means setting the -L and -B paths correctly.
#
proc libgloss_link_flags { args } {
    global target_cpu
    global srcdir

    # libgloss doesn't work native
    if {[isnative]} {
	return ""
    }

    # if we're on a remote host, we can't search for the file, so we can only
    # use an installed compiler, so we don't add any paths here.
    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    # map the target_cpu to the proper libgloss directory. unfortunately, these
    # directory names are hardcoded into libgloss.
    switch -glob -- $target_cpu {
	"sparc86x" {
	    set cpu sparc
	}
	"sparclite" {
	    set cpu sparc
	}
	"sparclet" {
	    set cpu sparc
	}
	"sparc64*" {
	    set cpu sparc
	}
	"hppa*" {
	    set cpu pa
	}
	"mips*" {
	    set cpu mips
	}
	"powerpc*" {
	    set cpu rs6000
	}
	"d10v*" {
	    set cpu libnosys
	}
	"xscale*" {
	    set cpu arm
	}
	"aarch64*" {
	    set cpu aarch64
	}
	default {
	    set cpu $target_cpu
	}
    }

    set gloss_srcdir ""
    # look for the libgloss srcdir sp we can find the linker scripts
    set gloss_srcdir [lookfor_file $srcdir libgloss/$cpu]

    # set the proper paths for gcc if the target subdir exists, else assume we
    # have no libgloss support for this target.
    if { $gloss_srcdir eq "" } {
	return ""
    }
    if {[file exists [file join $gccpath libgloss $cpu]]} {
	verbose "Libgloss path is $gccpath/libgloss/$cpu" 2
	return "-B$gccpath/libgloss/$cpu/ -L$gccpath/libgloss/$cpu -L$gloss_srcdir"
    } else {
	verbose -log "No libgloss support for this target." 2
	return ""
    }
}

# There aren't any, but we'll be orthogonal here.
#
proc libgloss_include_flags { args } {
    return ""
}

# Find the newlib libraries in the current source tree.
#
proc newlib_link_flags { args } {
    global tool_root_dir

    # libgloss doesn't work native
    if {[isnative]} {
	return ""
    }

    # if we're on a remote host, we can't search for the file, so we can only
    # use an installed compiler, so we don't add any paths here.
    if {[isremote host]} {
	return ""
    }

    set ld_script_path [lookfor_file $tool_root_dir "ld/ldscripts"]
    if { $ld_script_path ne "" } {
	set result "-L[file dirname $ld_script_path]"
    } else {
	set result ""
    }

    set gccpath "[get_multilibs]"

    verbose "Looking for $gccpath/newlib"
    if {[file exists [file join $gccpath newlib]]} {
	verbose "Newlib path is $gccpath/newlib"
	return "$result -B$gccpath/newlib/ -L$gccpath/newlib"
    } else {
	verbose "No newlib support for this target"
	return $result
    }
}

proc newlib_include_flags { args } {
    global srcdir

    if {[isnative]} {
	return ""
    }

    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    if {[file exists [file join $gccpath newlib]]} {
	verbose "Newlib path is $gccpath/newlib"

	set newlib_dir [lookfor_file $srcdir newlib/libc/include/assert.h]
	if { $newlib_dir ne "" } {
	    set newlib_dir [file dirname $newlib_dir]
	}
	# Note - we use -isystem rather than -I because newlib contains
	# system header files.  This is especially important for the
	# limits.h header which makes use of the #include_next directive.
	# #include_next will generate error messages from GCC if compiling
	# in strict ANSI mode or if another limits.h header cannot be found.
	# When it is included via -isystem these things do not happen.
	return " -isystem $gccpath/newlib/targ-include -isystem $newlib_dir"
    } else {
	verbose "No newlib support for this target"
    }
}

proc libio_include_flags { args } {
    global srcdir
    global tool_root_dir

    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    if { $gccpath eq "" } {
	set gccpath $tool_root_dir
    }

    set libio_bin_dir [lookfor_file $gccpath libio/_G_config.h]

    # linux doesn't build _G_config.h and the test above fails, so
    # we search for iostream.list too.
    if { $libio_bin_dir eq "" } {
	set libio_bin_dir [lookfor_file $gccpath libio/iostream.list]
    }

    set libio_src_dir [lookfor_file $srcdir libio/Makefile.in]
    if { $libio_bin_dir ne "" && $libio_src_dir ne "" } {
	set libio_src_dir [file dirname $libio_src_dir]
	set libio_bin_dir [file dirname $libio_bin_dir]
	# Note - unlike the newlib_include_flags proc above we use the -I
	# switch to specify the include paths.  This is because these headers
	# are not system headers, and if -isystem were to be used GCC would
	# generate an implicit extern "C" { ... } surrounding them.  This
	# will break targets which do not define NO_IMPLICIT_EXTERN_C.
	return " -I$libio_src_dir -I$libio_bin_dir"
    } else {
	return ""
    }
}

proc libio_link_flags { args } {
    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    set libio_dir [lookfor_file $gccpath libio/libio.a]
    if { $libio_dir ne "" } {
	return "-L[file dirname $libio_dir]"
    } else {
	return ""
    }
}

proc g++_include_flags { args } {
    global srcdir
    global target_alias

    if {[isremote host]} {
	return ""
    }

    set gccpath [get_multilibs]
    set libio_dir ""
    set flags ""

    set dir [lookfor_file $srcdir libg++]
    if { $dir ne "" } {
	# See comment in libio_include_flags about using -I.
	append flags " -I$dir -I$dir/src"
    }

    set dir [lookfor_file $srcdir libstdc++-v3]
    if { $dir ne "" } {
	append flags " -I$dir/include -I$dir/include/std -I$dir/include/c_std -I$dir/libsupc++"
    }

    set dir [lookfor_file $gccpath libstdc++-v3]
    if { $dir ne "" } {
	append flags " -I$dir/include -I$dir/include/$target_alias"
    }

    set dir [lookfor_file $srcdir libstdc++]
    if { $dir ne "" } {
	append flags " -I$dir -I$dir/stl"
    }

    return $flags
}

proc g++_link_flags { args } {
    global srcdir
    global ld_library_path

    set gccpath [get_multilibs]
    set libio_dir ""
    set flags ""
    set ld_library_path "."

    if { $gccpath ne "" } {
	if {[file exists [file join $gccpath lib libstdc++.a]]} {
	    append ld_library_path ":$gccpath/lib"
	}
	if {[file exists [file join $gccpath libg++ libg++.a]]} {
	    append flags "-L$gccpath/libg++ "
	    append ld_library_path ":$gccpath/libg++"
	}
	if {[file exists [file join $gccpath libstdc++ libstdc++.a]]} {
	    append flags "-L$gccpath/libstdc++ "
	    append ld_library_path ":$gccpath/libstdc++"
	}
	if {[file exists [file join $gccpath libstdc++-v3 src .libs libstdc++.a]]} {
	    append flags "-L$gccpath/libstdc++-v3/src/.libs "
	    append ld_library_path ":$gccpath/libstdc++-v3/src/.libs"
	}
	if {[file exists [file join $gccpath libiberty libiberty.a]]} {
	    append flags "-L$gccpath/libiberty "
	}
	if {[file exists [file join $gccpath librx librx.a]]} {
	    append flags "-L$gccpath/librx "
	}
    } else {
	global tool_root_dir

	set libgpp [lookfor_file $tool_root_dir libg++]
	if { $libgpp ne "" } {
	    append flags "-L$libgpp "
	    append ld_library_path ":$libgpp"
	}
	set libstdcpp [lookfor_file $tool_root_dir libstdc++]
	if { $libstdcpp ne "" } {
	    append flags "-L$libstdcpp "
	    append ld_library_path ":$libstdcpp"
	}
	set libiberty [lookfor_file $tool_root_dir libiberty]
	if { $libiberty ne "" } {
	    append flags "-L$libiberty "
	}
	set librx [lookfor_file $tool_root_dir librx]
	if { $librx ne "" } {
	    append flags "-L$librx "
	}
    }
    return $flags
}

proc libstdc++_include_flags { args } {
    global srcdir
    global target_alias

    if {[isremote host]} {
	return ""
    }

    set gccpath [get_multilibs]
    set libio_dir ""
    set flags ""

    set dir [lookfor_file $srcdir libstdc++-v3]
    if { $dir ne "" } {
	# See comment in libio_include_flags about using -I.
	append flags " -I$dir/include -I$dir/include/std -I$dir/include/c_std -I$dir/libsupc++"
    }

    set gccpath [get_multilibs]

    set dir [lookfor_file $gccpath libstdc++-v3]
    if { $dir ne "" } {
	append flags " -I$dir/include -I$dir/include/$target_alias"
    }

    set dir [lookfor_file $srcdir libstdc++]
    if { $dir ne "" } {
	append flags " -I$dir -I$dir/stl"
    }

    return $flags
}

proc libstdc++_link_flags { args } {
    global srcdir
    global ld_library_path

    set gccpath [get_multilibs]
    set libio_dir ""
    set flags ""

    if { $gccpath ne "" } {
	if {[file exists [file join $gccpath libstdc++ libstdc++.a]]} {
	    append flags "-L$gccpath/libstdc++ "
	    append ld_library_path ":$gccpath/libstdc++"
	}
	if {[file exists [file join $gccpath libiberty libiberty.a]]} {
	    append flags "-L$gccpath/libiberty "
	}
	if {[file exists [file join $gccpath librx librx.a]]} {
	    append flags "-L$gccpath/librx "
	}
    } else {
	global tool_root_dir

	set libstdcpp [lookfor_file $tool_root_dir libstdc++]
	if { $libstdcpp ne "" } {
	    append flags "-L$libstdcpp "
	    append ld_library_path ":$libstdcpp"
	}
	set libiberty [lookfor_file $tool_root_dir libiberty]
	if { $libiberty ne "" } {
	    append flags "-L$libiberty "
	}
	set librx [lookfor_file $tool_root_dir librx]
	if { $librx ne "" } {
	    append flags "-L$librx "
	}
    }
    return $flags
}

# Get the list of directories and -m options for gcc. This is kinda bogus that
# generic testing software needs support for gcc hardwired in, but to make
# testing the GNU tools work right, there didn't seem to be any other way.
#
proc get_multilibs { args } {
    global target_alias
    global board
    global board_info

    # if we're on a remote host, we can't search for the file, so we can only
    # use an installed compiler, so we don't add any paths here.
    if {[isremote host]} {
	return ""
    }

    if {[info exists board]} {
	set target_board $board
    } else {
	set target_board [target_info name]
    }

    if { [llength $args] == 0 } {
	if {[board_info $target_board exists multitop]} {
	    return "[board_info $target_board multitop]"
	}

	set board_info($target_board,multitop) ""
    }

    if { [board_info $target_board exists compiler] } {
	set compiler [board_info $target_board compiler]
    } else {
	set compiler [find_gcc]
    }

    if { $compiler eq "" } {
	return ""
    }

    foreach x $compiler {
	if {[regexp "^-B" $x]} {
	    regsub "^-B" $x "" comp_base_dir
	    set comp_base_dir [file dirname $comp_base_dir]
	    break
	}
    }

    regexp "/.* " $compiler compiler
    set compiler [string trimright $compiler " "]
    verbose "compiler is $compiler"

    if { [which $compiler] == 0 } {
	return ""
    }

    if { [llength $args] > 0 } {
	set mopts [lindex $args 0]
    } else {
	if { [board_info $target_board exists multilib_flags] } {
	    set mopts [board_info $target_board multilib_flags]
	} else {
	    set mopts ""
	}
    }

    set default_multilib [exec $compiler --print-multi-lib]
    set default_multilib [lindex $default_multilib 0]
    set extra [string trimleft $default_multilib ".;@@"]

    # extract the options and their directory names as know by gcc
    foreach i "[exec $compiler --print-multi-lib]" {
	if {$extra ne ""} {
	    # string trimright would do the wrong thing if we included
	    # the leading @@ in $extra
	    set i [string trimright $i $extra]
	    set i [string trimright $i "@@"]
	}
	set opts ""
	set dir ""
	regexp -- "\[a-z0-9=/\.-\]*;" $i dir
	set dir [string trimright $dir "\;@"]
	regexp -- "\;@*\[\@a-zA-Z0-9=/\.-\]*" $i opts
	set opts [split [string trimleft $opts "\;@@"] "@@"]
	lappend multilibs "$dir {$opts }"

	# If args contains arguments don't use the first one as
	# multilib option unless it qualifies as a multilib option.
	if { [llength $args] > 0 } {
	    set override_opt [lindex $args 0]
	    foreach j $opts {
		if {$j == $override_opt} {
		    set mopts $override_opt
		}
	    }
	}
    }

    regsub "^-" $mopts "" moptions
    regsub -all " -" $moptions " " dirty_moptions
    set moptions ""
    foreach x [split $dirty_moptions " "] {
	if { $x ne "" && [lsearch -exact $moptions $x] < 0 } {
	    lappend moptions $x
	}
    }

    if {![info exists comp_base_dir]} {
	set comp_base_dir [file dirname [file dirname [file dirname [file dirname [file dirname [exec $compiler --print-prog-name=cc1]]]]]]
    }

    # search for the top level multilib directory
    set multitop [lookfor_file $comp_base_dir $target_alias]
    if { $multitop eq "" } {
	set multitop [lookfor_file $comp_base_dir "libraries"]
	if { $multitop eq "" } {
	    set multitop "[lookfor_file $comp_base_dir gcc/xgcc]"
	    if { $multitop ne "" } {
		set multitop [file dirname [file dirname $multitop]]
	    } else {
		return ""
	    }
	}
    }

    set gccpath [eval exec $compiler --print-multi-directory $mopts]
    set gccpath [lindex $gccpath 0]
    if { $gccpath ne "" } {
	verbose "GCC path is $gccpath"
	if { [llength $args] == 0 } {
	    set board_info($target_board,multitop) $multitop/$gccpath
	}
	return $multitop/$gccpath
    }

    # extract the MULTILIB_MATCHES from dumpspecs
    set multimatches ""
    set lines [split [exec $compiler -dumpspecs] "\n"]
    for {set i 0} {$i <= [llength $lines] - 1} {incr i 1} {
	if {"*multilib_matches:" eq "[lindex $lines $i]"} {
	    set multimatches [lindex $lines [expr {$i + 1}]]
	    break
	}
    }
    # if we find some
    if {$multimatches ne ""} {
	# Split it into a list of pairs. If an moptions are the first
	# of a pair, then replace it with the second.  If an moption
	# is not in multimatches, we assume it's not a multilib option

	set splitmatches [split $multimatches ";"]
	set multimatches ""
	foreach i $splitmatches {
	    lappend multimatches [split $i " "]
	}
	verbose "multimatches: $multimatches" 3

	verbose "options before multimatches: $moptions" 3
	set toptions $moptions
	set moptions ""
	foreach i $toptions {
	    foreach j $multimatches {
		verbose "comparing [lindex $j 0] == $i" 3
		if {[lindex $j 0] == $i} {
		    lappend moptions [lindex $j 1]
		}
	    }
	}
	verbose "options after multimatches: $moptions" 3
    }

    # make a list of -m<foo> options from the various compiler config variables
    set gccpath ""

    # compare the lists of gcc options with the list of support multilibs
    verbose "Supported multilibs are: $multilibs" 3
    set best 0
    foreach i $multilibs {
	set hits 0
	set opts [lindex $i 1]
	if { [llength $opts] <= [llength $moptions] } {
	    foreach j $moptions {
		# see if all the -m<foo> options match any of the multilibs
		verbose "Looking in $i for $j" 3
		if { [lsearch -exact $opts $j] >= 0 } {
		    incr hits
		}
	    }

	    if { $hits > $best } {
		verbose "[lindex $i 0] is better, using as gcc path" 2
		set gccpath "[lindex $i 0]"
		set best $hits
	    }
	}
    }
    if {![info exists multitop]} {
	return ""
    }

    verbose "gccpath is $gccpath" 3

    if {[file exists [file join $multitop $gccpath]]} {
	verbose "GCC path is $multitop/$gccpath" 3
	if { [llength $args] == 0 } {
	    set board_info($target_board,multitop) $multitop/$gccpath
	}
	return $multitop/$gccpath
    } else {
	verbose "GCC path is $multitop" 3
	if { [llength $args] == 0 } {
	    set board_info($target_board,multitop) $multitop
	}
	return $multitop
    }
}

proc find_binutils_prog { name } {
    global tool_root_dir

    if {![isremote host]} {

	set file [lookfor_file $tool_root_dir $name]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir $name-new]
	}
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir binutils/$name]
	}
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir binutils/$name-new]
	}
	if { $file ne "" } {
	    set NAME $file
	} else {
	    set NAME [transform $name]
	}
    } else {
	set NAME [transform $name]
    }
    return $NAME
}

proc find_gcc {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir xgcc]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/xgcc]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform gcc]
	}
    } else {
	set CC [transform gcc]
    }
    return $CC
}

proc find_gcj {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir gcj]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/gcj]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform gcj]
	}
    } else {
	set CC [transform gcj]
    }
    return $CC
}

proc find_g++ {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir xg++]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/xg++]
	}
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir g++]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform g++]
	}
    } else {
	set CC [transform g++]
    }
    return $CC
}

proc find_gdc {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir gdc]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/gdc]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform gdc]
	}
    } else {
	set CC [transform gdc]
    }
    return $CC
}

proc find_g77 {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir g77]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/g77]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform g77]
	}
    } else {
	set CC [transform g77]
    }
    return $CC
}

proc find_gfortran {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir gfortran]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/gfortran]
	}
	if { $file ne "" } {
	    set CC "$file -B[file dirname $file]/"
	} else {
	    set CC [transform gfortran]
	}
    } else {
	set CC [transform gfortran]
    }
    return $CC
}

proc find_gnatmake {} {
    global tool_root_dir

    if {![isremote host]} {
	set file [lookfor_file $tool_root_dir gnatmake]
	if { $file eq "" } {
	    set file [lookfor_file $tool_root_dir gcc/gnatmake]
	}
	if { $file ne "" } {
	    set root [file dirname $file]
	    set CC "$file -I$root/ada/rts --GCC=$root/xgcc --GNATBIND=$root/gnatbind --GNATLINK=$root/gnatlink -cargs -B$root -largs --GCC=$root/xgcc -B$root -margs"
	} else {
	    set CC [transform gnatmake]
	}
    } else {
	set CC [transform gnatmake]
    }
    return $CC
}

proc find_go {} {
    global tool_root_dir

    set GO ""

    if {![is_remote host]} {
	set file [lookfor_file $tool_root_dir gccgo]
	if { $file ne "" } {
	    set root [file dirname $file]
	    set GO "$file -B$root/gcc/"
	}
    }

    if { $GO eq "" } {
	set GO [transform gccgo]
    }

    return $GO
}

proc find_go_linker {} {
    return [find_go]
}

proc find_rustc {} {
    global tool_root_dir
    if {![is_remote host]} {
	set rustc [lookfor_file $tool_root_dir rustc]
	if {$rustc eq ""} {
	    set rustc rustc
	}
    } else {
	set rustc ""
    }
    if {$rustc ne ""} {
	append rustc " --color never"
    }
    return $rustc
}

proc find_nm {} {
    global tool_root_dir

    set NM ""
    if {![isremote host]} {
	set NM [lookfor_file $tool_root_dir nm-new]
	if {$NM eq ""} {
	    set NM [lookfor_file $tool_root_dir binutils/nm-new]
	}
    }
    if { $NM eq ""} {
	set NM [transform nm]
    }
    return $NM
}

proc process_multilib_options { args } {
    global board
    global board_variant_list
    global is_gdb_remote

    set is_gdb_remote 0

    if {[board_info $board exists multilib_flags]} {
	return
    }
    eval add_multilib_option $args

    set multilib_flags ""

    foreach x $board_variant_list {
	regsub -all "^\[ \t\]*" $x "" x
	regsub -all "\[ \t\]*$" $x "" x

	if { $x eq "" } {
	    continue
	}
	switch -glob -- $x {
	    "aout" {
		set_board_info obj_format "a.out"
	    }
	    "elf" {
		set_board_info obj_format "elf"
	    }
	    "pe" {
		set_board_info obj_format "pe"
	    }
	    "ecoff" {
		set_board_info obj_format "ecoff"
	    }
	    "stabs" {
		set_board_info debug_flags "-gstabs"
	    }
	    "dwarf2" {
		set_board_info debug_flags "-gdwarf2"
	    }
	    "gdb:*=*" {
		regsub "^gdb:\[^=\]*=(.*)$" $x "\\1" value
		regsub "^gdb:(\[^=\]*)=.*$" $x "\\1" variable
		set_board_info $variable $value
	    }
	    "gdb*remote" {
		set is_gdb_remote 1
	    }
	    "little*endian" -
	    "el" -
	    "EL" {
		append multilib_flags " -EL"
	    }
	    "big*endian" -
	    "eb" -
	    "EB" {
		append multilib_flags " -EB"
	    }
	    "soft*float" {
		append multilib_flags " -msoft-float"
	    }
	    "-*" {
		append multilib_flags " $x"
	    }
	    default {
		append multilib_flags " -m$x"
	    }
	}
    }
    set_board_info multilib_flags $multilib_flags
}

proc add_multilib_option { args } {
    global board_variant_list

    if {![info exists board_variant_list]} {
	set board_variant_list ""
    }
    set board_variant_list [concat $args $board_variant_list]
}

proc find_gas { } {
    global tool_root_dir

    set AS ""

    if {![isremote host]} {
	set AS [lookfor_file $tool_root_dir as-new]
	if { $AS eq "" } {
	    set AS [lookfor_file $tool_root_dir gas/as-new]
	}
    }
    if { $AS eq "" } {
	set AS [transform as]
    }
    return $AS
}

proc find_ld { } {
    global tool_root_dir

    set LD ""

    if {![isremote host]} {
	set LD [lookfor_file $tool_root_dir ld-new]
	if { $LD eq "" } {
	    set LD [lookfor_file $tool_root_dir ld/ld-new]
	}
    }
    if { $LD eq "" } {
	set LD [transform ld]
    }
    return $LD
}

proc build_wrapper { gluefile } {
    global libdir
    global tool

    if {[target_info exists wrap_m68k_aout]} {
	set flags "additional_flags=-DWRAP_M68K_AOUT"
	set result ""
    } elseif {[target_info exists uses_underscores]} {
	set flags "additional_flags=-DUNDERSCORES"
	set result "-Wl,-wrap,_exit -Wl,-wrap,__exit -Wl,-wrap,_main -Wl,-wrap,_abort"

    } else {
	set flags ""
	if {[target_info exists is_vxworks]} {
	    set flags "additional_flags=-DVXWORKS"
	    set result "-Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort"
	} else {
	    set result "-Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort"
	}
    }
    if {[target_info exists wrap_compile_flags]} {
	lappend flags "additional_flags=[target_info wrap_compile_flags]"
    }
    if { [target_compile $libdir/testglue.c $gluefile object $flags] eq "" } {
	set gluefile [remote_download host $gluefile ${tool}_tg.o]
	return [list $gluefile $result]
    } else {
	return ""
    }
}


proc winsup_include_flags { args } {
    global srcdir

    if {[isnative]} {
	return ""
    }

    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    if {[file exists [file join $gccpath winsup]]} {
	verbose "Winsup path is $gccpath/winsup"

	set winsup_dir [lookfor_file $srcdir winsup/include/windows.h]
	if { $winsup_dir ne "" } {
	    set winsup_dir [file dirname $winsup_dir]
	    # See comment in libio_include_flags about using -I.
	    return " -I$winsup_dir"
	}
    }
    verbose "No winsup support for this target"

}

# Find the winsup libraries in the current source tree.
#
proc winsup_link_flags { args } {
    # libgloss doesn't work native
    if {[isnative]} {
	return ""
    }

    # if we're on a remote host, we can't search for the file, so we can only
    # use an installed compiler, so we don't add any paths here.
    if {[isremote host]} {
	return ""
    }

    set gccpath "[get_multilibs]"

    verbose "Looking for $gccpath/winsup"
    if {[file exists [file join $gccpath winsup]]} {
	verbose "Winsup path is $gccpath/newlib"
	return "-B$gccpath/winsup/ -L$gccpath/winsup"
    } else {
	verbose "No winsup support for this target"
	return ""
    }
}