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# Copyright (C) 2011-2013 Daniel Scharrer
#
# This software is provided 'as-is', without any express or implied
# warranty. In no event will the author(s) be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
# claim that you wrote the original software. If you use this software
# in a product, an acknowledgment in the product documentation would be
# appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
# misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.
function(check_compile RESULT FILE FLAG TYPE)
string(REGEX REPLACE "[^a-zA-Z0-9_][^a-zA-Z0-9_]*" "-" cachevar "${TYPE}-${FLAG}")
set(cahevar "CHECK_COMPILE_${cahevar}")
if(DEFINED ${cachevar})
if(${cachevar})
set(${RESULT} "${FLAG}" PARENT_SCOPE)
else()
set(${RESULT} "" PARENT_SCOPE)
endif()
return()
endif()
# CMake already has a check_cxx_compiler_flag macro in CheckCXXCompilerFlag, but
# it prints the result variable in the output (which is ugly!) and also uses it
# as a key to cache checks - so it would need to be unique for each flag.
# Unfortunately it also naively pastes the variable name inside a regexp so
# if we tried to use the flag itself in the variable name it will fail for -std=c++11.
# But we can at least use the expressions for warnings from that macro (and more):
set(fail_regexps
"warning:" # general
"unrecognized .*option" # GNU
"unknown .*option" # Clang
"ignoring unknown option" # MSVC
"warning D9002" # MSVC, any lang
"option.*not supported" # Intel
"invalid argument .*option" # Intel
"ignoring option .*argument required" # Intel
"command line warning" # Intel
"[Uu]nknown option" # HP
"[Ww]arning: [Oo]ption" # SunPro
"command option .* is not recognized" # XL
"not supported in this configuration; ignored" # AIX
"File with unknown suffix passed to linker" # PGI
"WARNING: unknown flag:" # Open64
)
# Set the flags to check
set(old_CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
set(old_CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
set(old_CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
set(old_CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS}")
if("${TYPE}" STREQUAL "linker flag")
set(CMAKE_EXE_LINKER_FLAGS "${old_CMAKE_EXE_LINKER_FLAGS} ${FLAG}")
set(CMAKE_SHARED_LINKER_FLAGS "${old_CMAKE_SHARED_LINKER_FLAGS} ${FLAG}")
set(CMAKE_MODULE_LINKER_FLAGS "${old_CMAKE_MODULE_LINKER_FLAGS} ${FLAG}")
elseif("${TYPE}" STREQUAL "compiler flag")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FLAG}")
endif()
# Check if we can compile and link a simple file with the new flags
try_compile(
check_compiler_flag ${CMAKE_BINARY_DIR} ${FILE}
CMAKE_FLAGS "-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
"-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_EXE_LINKER_FLAGS}"
"-DCMAKE_SHARED_LINKER_FLAGS=${CMAKE_SHARED_LINKER_FLAGS}"
"-DCMAKE_MODULE_LINKER_FLAGS=${CMAKE_MODULE_LINKER_FLAGS}"
OUTPUT_VARIABLE ERRORLOG
)
# Restore the old flags
set(CMAKE_CXX_FLAGS "${old_CMAKE_CXX_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${old_CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${old_CMAKE_SHARED_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${old_CMAKE_MODULE_LINKER_FLAGS}")
if(NOT check_compiler_flag)
message(STATUS "Checking ${TYPE}: ${FLAG} - unsupported")
set(${RESULT} "" PARENT_SCOPE)
set("${cachevar}" 0 CACHE INTERNAL "...")
else()
set(has_warning 0)
foreach(expr IN LISTS fail_regexps)
if("${ERRORLOG}" MATCHES "${expr}")
set(has_warning 1)
endif()
endforeach()
if(has_warning)
message(STATUS "Checking ${TYPE}: ${FLAG} - unsupported (warning)")
set(${RESULT} "" PARENT_SCOPE)
set("${cachevar}" 0 CACHE INTERNAL "...")
else()
message(STATUS "Checking ${TYPE}: ${FLAG}")
set(${RESULT} "${FLAG}" PARENT_SCOPE)
set("${cachevar}" 1 CACHE INTERNAL "...")
endif()
endif()
endfunction(check_compile)
function(check_flag RESULT FLAG TYPE)
set(compile_test_file "${CMAKE_CURRENT_BINARY_DIR}/compile_flag_test.cpp")
file(WRITE ${compile_test_file} "__attribute__((const)) int main(){ return 0; }\n")
check_compile(result "${compile_test_file}" "${FLAG}" "${TYPE} flag")
set(${RESULT} "${result}" PARENT_SCOPE)
endfunction(check_flag)
function(check_compiler_flag RESULT FLAG)
check_flag(result "${FLAG}" compiler)
set(${RESULT} "${result}" PARENT_SCOPE)
endfunction(check_compiler_flag)
function(check_linker_flag RESULT FLAG)
check_flag(result "${FLAG}" linker)
set(${RESULT} "${result}" PARENT_SCOPE)
endfunction(check_linker_flag)
function(add_cxxflag FLAG)
check_compiler_flag(RESULT "${FLAG}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${RESULT}" PARENT_SCOPE)
if("${RESULT}" STREQUAL "")
set(FLAG_FOUND 0 PARENT_SCOPE)
else()
set(FLAG_FOUND 1 PARENT_SCOPE)
endif()
endfunction(add_cxxflag)
function(add_ldflag FLAG)
check_linker_flag(RESULT "${FLAG}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${RESULT}" PARENT_SCOPE)
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${RESULT}" PARENT_SCOPE)
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${RESULT}" PARENT_SCOPE)
if("${RESULT}" STREQUAL "")
set(FLAG_FOUND 0 PARENT_SCOPE)
else()
set(FLAG_FOUND 1 PARENT_SCOPE)
endif()
endfunction(add_ldflag)
function(try_link_library LIBRARY_NAME LIBRARY_FILE ERROR_VAR)
# See if we can link a simple program with the library using the configured c++ compiler
set(link_test_file "${CMAKE_CURRENT_BINARY_DIR}/link_test.cpp")
file(WRITE ${link_test_file} "int main(){}\n")
if(CMAKE_THREAD_LIBS_INIT)
list(APPEND LIBRARY_FILE "${CMAKE_THREAD_LIBS_INIT}")
endif()
try_compile(
CHECK_${LIBRARY_NAME}_LINK "${CMAKE_BINARY_DIR}" "${link_test_file}"
CMAKE_FLAGS "-DLINK_LIBRARIES=${LIBRARY_FILE}"
"-DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}"
"-DCMAKE_EXE_LINKER_FLAGS=${CMAKE_EXE_LINKER_FLAGS}"
"-DCMAKE_SHARED_LINKER_FLAGS=${CMAKE_SHARED_LINKER_FLAGS}"
"-DCMAKE_MODULE_LINKER_FLAGS=${CMAKE_MODULE_LINKER_FLAGS}"
OUTPUT_VARIABLE ERRORLOG
)
set(${ERROR_VAR} "${ERRORLOG}" PARENT_SCOPE)
endfunction(try_link_library)
##############################################################################
# Check that a a library actually works for the current configuration
function(check_link_library LIBRARY_NAME LIBRARY_VARIABLE)
set(lib_current "${${LIBRARY_VARIABLE}}")
set(found_var "ARX_CLL_${LIBRARY_NAME}_FOUND")
set(working_var "ARX_CLL_${LIBRARY_NAME}_WORKING")
if(CHECK_${LIBRARY_NAME}_LINK)
set(lib_found "${${found_var}}")
set(lib_working "${${working_var}}")
if((lib_current STREQUAL lib_found) OR (lib_current STREQUAL lib_working))
set("${LIBRARY_VARIABLE}" "${lib_working}" PARENT_SCOPE)
return()
endif()
endif()
set("${found_var}" "${lib_current}" CACHE INTERNAL "...")
if(NOT lib_current STREQUAL "")
message(STATUS "Checking ${LIBRARY_NAME}: ${lib_current}")
endif()
# Check if we can link to the full path found by find_package
try_link_library(${LIBRARY_NAME} "${lib_current}" ERRORLOG1)
if(CHECK_${LIBRARY_NAME}_LINK)
set("${working_var}" "${lib_current}" CACHE INTERNAL "...")
return()
endif()
# Check if the linker is smarter than cmake and try to link with only the library name
string(REGEX REPLACE "(^|;)[^;]*/lib([^;/]*)\\.so" "\\1-l\\2"
LIBRARY_FILE "${lib_current}")
if(NOT LIBRARY_FILE STREQUAL lib_current)
try_link_library(${LIBRARY_NAME} "${LIBRARY_FILE}" ERRORLOG2)
if(CHECK_${LIBRARY_NAME}_LINK)
message(STATUS " -> using ${LIBRARY_FILE} instead")
set("${LIBRARY_VARIABLE}" "${LIBRARY_FILE}" PARENT_SCOPE)
set("${working_var}" "${LIBRARY_FILE}" CACHE INTERNAL "...")
return()
endif()
endif()
# Force cmake to search again, as the cached library doesn't work
unset(FIND_PACKAGE_MESSAGE_DETAILS_${ARGV2} CACHE)
unset(FIND_PACKAGE_MESSAGE_DETAILS_${LIBRARY_NAME} CACHE)
message(FATAL_ERROR "\n${ERRORLOG1}\n\n${ERRORLOG2}\n\n"
"!! No suitable version of ${LIBRARY_NAME} found.\n"
" Maybe you don't have the right (32 vs.64 bit) architecture installed?\n\n"
" Tried ${lib_current} and ${LIBRARY_FILE}\n"
" Using compiler ${CMAKE_CXX_COMPILER} ${CMAKE_CXX_FLAGS}\n\n\n")
endfunction(check_link_library)
function(force_recheck_library LIBRARY_NAME)
unset(FIND_PACKAGE_MESSAGE_DETAILS_${ARGV1} CACHE)
unset(FIND_PACKAGE_MESSAGE_DETAILS_${LIBRARY_NAME} CACHE)
unset(CHECK_${LIBRARY_NAME}_LINK CACHE)
endfunction()
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