CheckCSourceCompiles.cmake 3.79 KB
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#.rst:
# CheckCSourceCompiles
# --------------------
#
# Check if given C source compiles and links into an executable
#
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# CHECK_C_SOURCE_COMPILES(<code> <var> [FAIL_REGEX <fail-regex>])
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#
# ::
#
#   <code>       - source code to try to compile, must define 'main'
#   <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
#
# The following variables may be set before calling this macro to modify
# the way the check is run:
#
# ::
#
#   CMAKE_REQUIRED_FLAGS = string of compile command line flags
#   CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
#   CMAKE_REQUIRED_INCLUDES = list of include directories
#   CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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#   CMAKE_REQUIRED_QUIET = execute quietly without messages
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#=============================================================================
# Copyright 2005-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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#  License text for the above reference.)

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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)
    set(_key)
    foreach(arg ${ARGN})
      if("${arg}" MATCHES "^(FAIL_REGEX)$")
        set(_key "${arg}")
      elseif(_key)
        list(APPEND _${_key} "${arg}")
      else()
        message(FATAL_ERROR "Unknown argument:\n  ${arg}\n")
      endif()
    endforeach()
    set(MACRO_CHECK_FUNCTION_DEFINITIONS
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      "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
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    if(CMAKE_REQUIRED_LIBRARIES)
      set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
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        LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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    else()
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      set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
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    endif()
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    if(CMAKE_REQUIRED_INCLUDES)
      set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
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        "-DINCLUDE_DIRECTORIES:STRING=${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)
      message(STATUS "Performing Test ${VAR}")
    endif()
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    try_compile(${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}"
      OUTPUT_VARIABLE OUTPUT)
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    foreach(_regex ${_FAIL_REGEX})
      if("${OUTPUT}" MATCHES "${_regex}")
        set(${VAR} 0)
      endif()
    endforeach()
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    if(${VAR})
      set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
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      if(NOT CMAKE_REQUIRED_QUIET)
        message(STATUS "Performing Test ${VAR} - Success")
      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)
        message(STATUS "Performing Test ${VAR} - Failed")
      endif()
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      set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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        "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
        "${OUTPUT}\n"
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        "Source file was:\n${SOURCE}\n")
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    endif()
  endif()
endmacro()
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