Add CheckCXXSymbolExists.cmake, so this can be used also for C++
This commit splits check_symbol_exists() so that the actual implementation can be also used by check_cxx_symbol_exists() Alex
This commit is contained in:
Alex Neundorf
parent
2a97c5d52f
commit
757a6a091c
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@ -0,0 +1,42 @@
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# - Check if a symbol exists as a function, variable, or macro in C++
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# CHECK_CXX_SYMBOL_EXISTS(<symbol> <files> <variable>)
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#
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# Check that the <symbol> is available after including given header
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# <files> and store the result in a <variable>. Specify the list
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# of files in one argument as a semicolon-separated list.
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# CHECK_CXX_SYMBOL_EXISTS() can be used to check in C++ files, as opposed
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# to CHECK_SYMBOL_EXISTS(), which works only for C.
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#
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# If the header files define the symbol as a macro it is considered
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# available and assumed to work. If the header files declare the
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# symbol as a function or variable then the symbol must also be
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# available for linking. If the symbol is a type or enum value
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# it will not be recognized (consider using CheckTypeSize or
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# CheckCSourceCompiles).
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#
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# The following variables may be set before calling this macro to
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# modify 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_INCLUDES = list of include directories
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# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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#=============================================================================
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# Copyright 2003-2011 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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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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INCLUDE(CheckSymbolExists)
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MACRO(CHECK_CXX_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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_CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.cxx" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
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ENDMACRO(CHECK_CXX_SYMBOL_EXISTS)
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@ -11,6 +11,8 @@
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# available for linking. If the symbol is a type or enum value
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# it will not be recognized (consider using CheckTypeSize or
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# CheckCSourceCompiles).
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# If the check needs to be done in C++, consider using CHECK_CXX_SYMBOL_EXISTS(),
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# which does the same as CHECK_SYMBOL_EXISTS(), but in C++.
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#
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# The following variables may be set before calling this macro to
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# modify the way the check is run:
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@ -34,6 +36,11 @@
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# License text for the above reference.)
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MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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_CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" )
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ENDMACRO(CHECK_SYMBOL_EXISTS)
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MACRO(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE)
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message(STATUS "files: -${FILES}-")
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IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
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SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
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@ -57,12 +64,12 @@ MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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"${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n#ifndef ${SYMBOL}\n cmakeRequireSymbol(0,&${SYMBOL});\n#endif\n return 0;\n}\n")
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CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
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"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY)
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"${SOURCEFILE}" @ONLY)
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MESSAGE(STATUS "Looking for ${SYMBOL}")
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TRY_COMPILE(${VARIABLE}
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${CMAKE_BINARY_DIR}
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${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c
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"${SOURCEFILE}"
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COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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CMAKE_FLAGS
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-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
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@ -75,7 +82,7 @@ MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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"Determining if the ${SYMBOL} "
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"exist passed with the following output:\n"
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"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
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"${OUTPUT}\nFile ${SOURCEFILE}:\n"
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"${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
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ELSE(${VARIABLE})
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MESSAGE(STATUS "Looking for ${SYMBOL} - not found.")
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@ -83,8 +90,8 @@ MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE)
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FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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"Determining if the ${SYMBOL} "
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"exist failed with the following output:\n"
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"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
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"${OUTPUT}\nFile ${SOURCEFILE}:\n"
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"${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
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ENDIF(${VARIABLE})
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ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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ENDMACRO(CHECK_SYMBOL_EXISTS)
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ENDMACRO(_CHECK_SYMBOL_EXISTS)
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