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-# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
-# file Copyright.txt or https://cmake.org/licensing for details.
-
-#[=======================================================================[.rst:
-CheckCSourceRuns
-----------------
-
-Check if given C source compiles and links into an executable and can
-subsequently be run.
-
-.. command:: check_c_source_runs
-
- ::
-
- check_c_source_runs(code resultVar)
-
- Check that the source supplied in ``code`` can be compiled as a C source
- file, linked as an executable and then run. The ``code`` must contain at
- least a ``main()`` function. If the code could be built and run successfully,
- the internal cache variable specified by ``resultVar`` will be set to 1,
- otherwise it will be set to an value that evaluates to boolean false (e.g.
- an empty string or an error message).
-
- The underlying check is performed by the :command:`try_run` command. The
- compile and link commands can be influenced by setting any of the following
- variables prior to calling ``check_c_source_runs()``:
-
- ``CMAKE_REQUIRED_FLAGS``
- Additional flags to pass to the compiler. Note that the contents of
- :variable:`CMAKE_C_FLAGS <CMAKE_<LANG>_FLAGS>` and its associated
- configuration-specific variable are automatically added to the compiler
- command before the contents of ``CMAKE_REQUIRED_FLAGS``.
-
- ``CMAKE_REQUIRED_DEFINITIONS``
- A :ref:`;-list <CMake Language Lists>` of compiler definitions of the form
- ``-DFOO`` or ``-DFOO=bar``. A definition for the name specified by
- ``resultVar`` will also be added automatically.
-
- ``CMAKE_REQUIRED_INCLUDES``
- A :ref:`;-list <CMake Language Lists>` of header search paths to pass to
- the compiler. These will be the only header search paths used by
- ``try_run()``, i.e. the contents of the :prop_dir:`INCLUDE_DIRECTORIES`
- directory property will be ignored.
-
- ``CMAKE_REQUIRED_LIBRARIES``
- A :ref:`;-list <CMake Language Lists>` of libraries to add to the link
- command. These can be the name of system libraries or they can be
- :ref:`Imported Targets <Imported Targets>` (see :command:`try_run` for
- further details).
-
- ``CMAKE_REQUIRED_QUIET``
- If this variable evaluates to a boolean true value, all status messages
- associated with the check will be suppressed.
-
- The check is only performed once, with the result cached in the variable
- named by ``resultVar``. Every subsequent CMake run will re-use this cached
- value rather than performing the check again, even if the ``code`` changes.
- In order to force the check to be re-evaluated, the variable named by
- ``resultVar`` must be manually removed from the cache.
-
-#]=======================================================================]
-
-macro(CHECK_C_SOURCE_RUNS SOURCE VAR)
- if(NOT DEFINED "${VAR}")
- set(MACRO_CHECK_FUNCTION_DEFINITIONS
- "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
- if(CMAKE_REQUIRED_LIBRARIES)
- set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
- LINK_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES})
- else()
- set(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
- endif()
- if(CMAKE_REQUIRED_INCLUDES)
- set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
- "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
- else()
- set(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
- endif()
- file(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
- "${SOURCE}\n")
-
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Performing Test ${VAR}")
- endif()
- try_run(${VAR}_EXITCODE ${VAR}_COMPILED
- ${CMAKE_BINARY_DIR}
- ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
- COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
- ${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}
- CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
- -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}
- "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
- COMPILE_OUTPUT_VARIABLE OUTPUT)
- # if it did not compile make the return value fail code of 1
- if(NOT ${VAR}_COMPILED)
- set(${VAR}_EXITCODE 1)
- endif()
- # if the return value was 0 then it worked
- if("${${VAR}_EXITCODE}" EQUAL 0)
- set(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Performing Test ${VAR} - Success")
- endif()
- file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
- "Performing C SOURCE FILE Test ${VAR} succeeded with the following output:\n"
- "${OUTPUT}\n"
- "Return value: ${${VAR}}\n"
- "Source file was:\n${SOURCE}\n")
- else()
- if(CMAKE_CROSSCOMPILING AND "${${VAR}_EXITCODE}" MATCHES "FAILED_TO_RUN")
- set(${VAR} "${${VAR}_EXITCODE}")
- else()
- set(${VAR} "" CACHE INTERNAL "Test ${VAR}")
- endif()
-
- if(NOT CMAKE_REQUIRED_QUIET)
- message(STATUS "Performing Test ${VAR} - Failed")
- endif()
- file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
- "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
- "${OUTPUT}\n"
- "Return value: ${${VAR}_EXITCODE}\n"
- "Source file was:\n${SOURCE}\n")
-
- endif()
- endif()
-endmacro()
-