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100 lines
3.5 KiB
CMake
100 lines
3.5 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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CheckLibraryExists
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------------------
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Check if the function exists.
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.. command:: CHECK_LIBRARY_EXISTS
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.. code-block:: cmake
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CHECK_LIBRARY_EXISTS(LIBRARY FUNCTION LOCATION VARIABLE)
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::
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LIBRARY - the name of the library you are looking for
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FUNCTION - the name of the function
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LOCATION - location where the library should be found
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VARIABLE - variable to store the result
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Will be created as an internal cache variable.
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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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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_LINK_OPTIONS = list of options to pass to link command
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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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#]=======================================================================]
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include_guard(GLOBAL)
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macro(CHECK_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
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if(NOT DEFINED "${VARIABLE}")
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set(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
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"-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_START "Looking for ${FUNCTION} in ${LIBRARY}")
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endif()
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set(CHECK_LIBRARY_EXISTS_LINK_OPTIONS)
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if(CMAKE_REQUIRED_LINK_OPTIONS)
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set(CHECK_LIBRARY_EXISTS_LINK_OPTIONS
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LINK_OPTIONS ${CMAKE_REQUIRED_LINK_OPTIONS})
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endif()
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set(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
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if(CMAKE_REQUIRED_LIBRARIES)
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set(CHECK_LIBRARY_EXISTS_LIBRARIES
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${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
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endif()
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if(CMAKE_C_COMPILER_LOADED)
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set(_cle_source ${CMAKE_ROOT}/Modules/CheckFunctionExists.c)
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elseif(CMAKE_CXX_COMPILER_LOADED)
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set(_cle_source ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CheckLibraryExists/CheckFunctionExists.cxx)
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configure_file(${CMAKE_ROOT}/Modules/CheckFunctionExists.c "${_cle_source}" COPYONLY)
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else()
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message(FATAL_ERROR "CHECK_FUNCTION_EXISTS needs either C or CXX language enabled")
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endif()
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try_compile(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${_cle_source}
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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${CHECK_LIBRARY_EXISTS_LINK_OPTIONS}
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LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
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-DLINK_DIRECTORIES:STRING=${LOCATION}
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OUTPUT_VARIABLE OUTPUT)
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unset(_cle_source)
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if(${VARIABLE})
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_PASS "found")
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endif()
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set(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
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"passed with the following output:\n"
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"${OUTPUT}\n\n")
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else()
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if(NOT CMAKE_REQUIRED_QUIET)
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message(CHECK_FAIL "not found")
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endif()
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set(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
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file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
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"failed with the following output:\n"
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"${OUTPUT}\n\n")
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endif()
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endif()
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endmacro()
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