100 lines
3.3 KiB
CMake
100 lines
3.3 KiB
CMake
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#.rst:
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# CheckCSourceCompiles
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# --------------------
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#
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# Check if given C source compiles and links into an executable
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#
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# CHECK_C_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>])
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#
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# ::
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#
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# <code> - source code to try to compile, must define 'main'
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# <var> - variable to store whether the source code compiled
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# Will be created as an internal cache variable.
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# <fail-regex> - fail if test output matches this regex
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#
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# The following variables may be set before calling this macro to modify
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# the way the check is run:
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#
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# ::
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#
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# CMAKE_REQUIRED_FLAGS = string of compile command line flags
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# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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# CMAKE_REQUIRED_INCLUDES = list of include directories
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# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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# CMAKE_REQUIRED_QUIET = execute quietly without messages
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macro(CHECK_C_SOURCE_COMPILES SOURCE VAR)
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if(NOT DEFINED "${VAR}")
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set(_FAIL_REGEX)
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set(_key)
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foreach(arg ${ARGN})
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if("${arg}" MATCHES "^(FAIL_REGEX)$")
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set(_key "${arg}")
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elseif(_key)
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list(APPEND _${_key} "${arg}")
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else()
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message(FATAL_ERROR "Unknown argument:\n ${arg}\n")
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endif()
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endforeach()
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set(MACRO_CHECK_FUNCTION_DEFINITIONS
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"-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
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if(CMAKE_REQUIRED_LIBRARIES)
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set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
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LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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else()
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set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
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endif()
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if(CMAKE_REQUIRED_INCLUDES)
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set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
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"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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else()
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set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
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endif()
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file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
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"${SOURCE}\n")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Performing Test ${VAR}")
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endif()
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try_compile(${VAR}
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${CMAKE_BINARY_DIR}
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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"${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
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OUTPUT_VARIABLE OUTPUT)
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foreach(_regex ${_FAIL_REGEX})
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if("${OUTPUT}" MATCHES "${_regex}")
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set(${VAR} 0)
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endif()
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endforeach()
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if(${VAR})
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set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Performing Test ${VAR} - Success")
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endif()
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Performing C SOURCE FILE Test ${VAR} succeeded with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${SOURCE}\n")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(STATUS "Performing Test ${VAR} - Failed")
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endif()
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set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
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"${OUTPUT}\n"
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"Source file was:\n${SOURCE}\n")
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endif()
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endif()
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endmacro()
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