147 lines
5.6 KiB
CMake
147 lines
5.6 KiB
CMake
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# 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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CheckCXXSourceCompiles
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----------------------
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Check if given C++ source compiles and links into an executable.
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.. command:: check_cxx_source_compiles
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.. code-block:: cmake
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check_cxx_source_compiles(<code> <resultVar>
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[FAIL_REGEX <regex1> [<regex2>...]])
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Check that the source supplied in ``<code>`` can be compiled as a C++ source
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file and linked as an executable (so it must contain at least a ``main()``
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function). The result will be stored in the internal cache variable specified
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by ``<resultVar>``, with a boolean true value for success and boolean false
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for failure. If ``FAIL_REGEX`` is provided, then failure is determined by
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checking if anything in the output matches any of the specified regular
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expressions.
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The underlying check is performed by the :command:`try_compile` command. The
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compile and link commands can be influenced by setting any of the following
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variables prior to calling ``check_cxx_source_compiles()``:
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``CMAKE_REQUIRED_FLAGS``
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Additional flags to pass to the compiler. Note that the contents of
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:variable:`CMAKE_CXX_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
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configuration-specific variable are automatically added to the compiler
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command before the contents of ``CMAKE_REQUIRED_FLAGS``.
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``CMAKE_REQUIRED_DEFINITIONS``
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A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
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``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
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``<resultVar>`` will also be added automatically.
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``CMAKE_REQUIRED_INCLUDES``
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A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
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the compiler. These will be the only header search paths used by
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``try_compile()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
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directory property will be ignored.
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``CMAKE_REQUIRED_LINK_OPTIONS``
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A :ref:`;-list <CMake Language Lists>` of options to add to the link
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command (see :command:`try_compile` for further details).
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``CMAKE_REQUIRED_LIBRARIES``
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A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
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command. These can be the name of system libraries or they can be
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:ref:`Imported Targets <Imported Targets>` (see :command:`try_compile` for
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further details).
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``CMAKE_REQUIRED_QUIET``
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If this variable evaluates to a boolean true value, all status messages
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associated with the check will be suppressed.
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The check is only performed once, with the result cached in the variable
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named by ``<resultVar>``. Every subsequent CMake run will re-use this cached
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value rather than performing the check again, even if the ``<code>`` changes.
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In order to force the check to be re-evaluated, the variable named by
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``<resultVar>`` must be manually removed from the cache.
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#]=======================================================================]
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include_guard(GLOBAL)
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macro(CHECK_CXX_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_LINK_OPTIONS)
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set(CHECK_CXX_SOURCE_COMPILES_ADD_LINK_OPTIONS
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LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
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else()
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set(CHECK_CXX_SOURCE_COMPILES_ADD_LINK_OPTIONS)
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endif()
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if(CMAKE_REQUIRED_LIBRARIES)
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set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES
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LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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else()
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set(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES)
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endif()
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if(CMAKE_REQUIRED_INCLUDES)
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set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES
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"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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else()
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set(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
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endif()
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file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.cxx"
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"${SOURCE}\n")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_START "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.cxx
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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${CHECK_CXX_SOURCE_COMPILES_ADD_LINK_OPTIONS}
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${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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"${CHECK_CXX_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(CHECK_PASS "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${SOURCE}\n")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_FAIL "Failed")
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endif()
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set(${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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