145 lines
5.8 KiB
CMake
145 lines
5.8 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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CheckOBJCXXSourceRuns
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---------------------
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Check if given Objective-C++ source compiles and links into an executable and can
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subsequently be run.
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.. command:: check_objcxx_source_runs
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.. code-block:: cmake
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check_objcxx_source_runs(<code> <resultVar>)
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Check that the source supplied in ``<code>`` can be compiled as a Objective-C++ source
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file, linked as an executable and then run. The ``<code>`` must contain at
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least a ``main()`` function. If the ``<code>`` could be built and run
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successfully, the internal cache variable specified by ``<resultVar>`` will
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be set to 1, otherwise it will be set to an value that evaluates to boolean
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false (e.g. an empty string or an error message).
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The underlying check is performed by the :command:`try_run` 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_objcxx_source_runs()``:
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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_OBJCXX_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_run()``, 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_run` 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_run` 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_OBJCXX_SOURCE_RUNS SOURCE VAR)
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if(NOT DEFINED "${VAR}")
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set(MACRO_CHECK_FUNCTION_DEFINITIONS
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"-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
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if(CMAKE_REQUIRED_LINK_OPTIONS)
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set(CHECK_OBJCXX_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_OBJCXX_SOURCE_COMPILES_ADD_LINK_OPTIONS)
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endif()
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if(CMAKE_REQUIRED_LIBRARIES)
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set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES
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LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
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else()
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set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES)
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endif()
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if(CMAKE_REQUIRED_INCLUDES)
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set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES
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"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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else()
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set(CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES)
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endif()
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file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.mm"
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"${SOURCE}\n")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_START "Performing Test ${VAR}")
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endif()
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try_run(${VAR}_EXITCODE ${VAR}_COMPILED
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${CMAKE_BINARY_DIR}
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.mm
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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${CHECK_OBJCXX_SOURCE_COMPILES_ADD_LINK_OPTIONS}
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${CHECK_OBJCXX_SOURCE_COMPILES_ADD_LIBRARIES}
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CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
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-DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
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"${CHECK_OBJCXX_SOURCE_COMPILES_ADD_INCLUDES}"
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COMPILE_OUTPUT_VARIABLE OUTPUT
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RUN_OUTPUT_VARIABLE RUN_OUTPUT)
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# if it did not compile make the return value fail code of 1
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if(NOT ${VAR}_COMPILED)
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set(${VAR}_EXITCODE 1)
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endif()
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# if the return value was 0 then it worked
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if("${${VAR}_EXITCODE}" EQUAL 0)
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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 Objective-C++ SOURCE FILE Test ${VAR} succeeded with the following output:\n"
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"${OUTPUT}\n"
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"...and run output:\n"
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"${RUN_OUTPUT}\n"
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"Return value: ${${VAR}}\n"
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"Source file was:\n${SOURCE}\n")
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else()
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if(CMAKE_CROSSCOMPILING AND "${${VAR}_EXITCODE}" MATCHES "FAILED_TO_RUN")
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set(${VAR} "${${VAR}_EXITCODE}")
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else()
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set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
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endif()
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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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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Performing Objective-C++ SOURCE FILE Test ${VAR} failed with the following output:\n"
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"${OUTPUT}\n"
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"...and run output:\n"
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"${RUN_OUTPUT}\n"
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"Return value: ${${VAR}_EXITCODE}\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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