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1include(CMakeCheckCompilerFlagCommonPatterns)2 3# Test compiler can compile simple C/C++/Objective-C program without invoking4# the linker.5#6# try_compile_only(7# OUTPUT_VAR8# [SOURCE source_text]9# [FLAGS flag_0 [ flag_1 ]]10# )11#12# OUTPUT_VAR - The variable name to store the result. The result is a boolean13# `True` or `False`.14#15# SOURCE - Optional. If specified use source the source text string16# specified. If not specified source code will be used that is C,17# C++, and Objective-C compatible.18#19# FLAGS - Optional. If specified pass the one or more specified flags to20# the compiler.21#22# EXAMPLES:23#24# try_compile_only(HAS_F_NO_RTTI FLAGS "-fno-rtti")25#26# try_compile_only(HAS_CXX_AUTO_TYPE_DECL27# SOURCE "int foo(int x) { auto y = x + 1; return y;}"28# FLAGS "-x" "c++" "-std=c++11" "-Werror=c++11-extensions"29# )30#31function(try_compile_only output)32 # NOTE: `SOURCE` needs to be a multi-argument because source code33 # often contains semicolons which happens to be CMake's list separator34 # which confuses `cmake_parse_arguments()`.35 cmake_parse_arguments(ARG "" "" "SOURCE;FLAGS" ${ARGN})36 if (ARG_UNPARSED_ARGUMENTS)37 message(FATAL_ERROR "Unexpected arguments \"${ARG_UNPARSED_ARGUMENTS}\"")38 endif()39 if(NOT ARG_SOURCE)40 set(ARG_SOURCE "int foo(int x, int y) { return x + y; }\n")41 endif()42 set(SIMPLE_C ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/src.c)43 file(WRITE ${SIMPLE_C} "${ARG_SOURCE}\n")44 string(REGEX MATCHALL "<[A-Za-z0-9_]*>" substitutions45 ${CMAKE_C_COMPILE_OBJECT})46 47 set(TRY_COMPILE_FLAGS "${ARG_FLAGS}")48 if(CMAKE_C_COMPILER_ID MATCHES Clang AND CMAKE_C_COMPILER_TARGET)49 list(APPEND TRY_COMPILE_FLAGS "--target=${CMAKE_C_COMPILER_TARGET}")50 endif()51 52 string(REPLACE ";" " " extra_flags "${TRY_COMPILE_FLAGS}")53 54 set(test_compile_command "${CMAKE_C_COMPILE_OBJECT}")55 foreach(substitution ${substitutions})56 if(substitution STREQUAL "<CMAKE_C_COMPILER>")57 string(REPLACE "<CMAKE_C_COMPILER>"58 "${CMAKE_C_COMPILER}" test_compile_command ${test_compile_command})59 elseif(substitution STREQUAL "<OBJECT>")60 string(REPLACE "<OBJECT>"61 "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/test.o"62 test_compile_command ${test_compile_command})63 elseif(substitution STREQUAL "<SOURCE>")64 string(REPLACE "<SOURCE>" "${SIMPLE_C}" test_compile_command65 ${test_compile_command})66 elseif(substitution STREQUAL "<FLAGS>")67 string(REPLACE "<FLAGS>" "${CMAKE_C_FLAGS} ${extra_flags}"68 test_compile_command ${test_compile_command})69 else()70 string(REPLACE "${substitution}" "" test_compile_command71 ${test_compile_command})72 endif()73 endforeach()74 75 # Strip quotes from the compile command, as the compiler is not expecting76 # quoted arguments (see discussion on D62063 for when this can come up). If77 # the quotes were there for arguments with spaces in them, the quotes were78 # not going to help since the string gets split on spaces below.79 string(REPLACE "\"" "" test_compile_command "${test_compile_command}")80 81 string(REPLACE " " ";" test_compile_command "${test_compile_command}")82 83 execute_process(84 COMMAND ${test_compile_command}85 RESULT_VARIABLE result86 OUTPUT_VARIABLE TEST_OUTPUT87 ERROR_VARIABLE TEST_ERROR88 )89 90 CHECK_COMPILER_FLAG_COMMON_PATTERNS(_CheckCCompilerFlag_COMMON_PATTERNS)91 set(ERRORS_FOUND OFF)92 foreach(var ${_CheckCCompilerFlag_COMMON_PATTERNS})93 if("${var}" STREQUAL "FAIL_REGEX")94 continue()95 endif()96 if("${TEST_ERROR}" MATCHES "${var}" OR "${TEST_OUTPUT}" MATCHES "${var}")97 set(ERRORS_FOUND ON)98 endif()99 endforeach()100 101 if(result EQUAL 0 AND NOT ERRORS_FOUND)102 set(${output} True PARENT_SCOPE)103 else()104 file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log105 "Testing compiler for supporting " ${ARGN} ":\n"106 "Command: ${test_compile_command}\n"107 "${TEST_OUTPUT}\n${TEST_ERROR}\n${result}\n")108 set(${output} False PARENT_SCOPE)109 endif()110endfunction()111 112function(builtin_check_c_compiler_flag flag output)113 if(NOT DEFINED ${output})114 message(STATUS "Performing Test ${output}")115 try_compile_only(result FLAGS ${flag} ${CMAKE_REQUIRED_FLAGS})116 set(${output} ${result} CACHE INTERNAL "Compiler supports ${flag}")117 if(${result})118 message(STATUS "Performing Test ${output} - Success")119 else()120 message(STATUS "Performing Test ${output} - Failed")121 endif()122 endif()123endfunction()124 125function(builtin_check_c_compiler_source output source)126 if(NOT DEFINED ${output})127 message(STATUS "Performing Test ${output}")128 try_compile_only(result SOURCE ${source})129 set(${output} ${result} CACHE INTERNAL "Compiler supports ${flag}")130 if(${result})131 message(STATUS "Performing Test ${output} - Success")132 else()133 message(STATUS "Performing Test ${output} - Failed")134 endif()135 endif()136endfunction()137