| # - Check if a symbol exists as a function, variable, or macro |
| # CHECK_SYMBOL_EXISTS(<symbol> <files> <variable>) |
| # |
| # Check that the <symbol> is available after including given header |
| # <files> and store the result in a <variable>. Specify the list |
| # of files in one argument as a semicolon-separated list. |
| # |
| # If the header files define the symbol as a macro it is considered |
| # available and assumed to work. If the header files declare the |
| # symbol as a function or variable then the symbol must also be |
| # available for linking. If the symbol is a type or enum value |
| # it will not be recognized (consider using CheckTypeSize or |
| # CheckCSourceCompiles). |
| # If the check needs to be done in C++, consider using CHECK_CXX_SYMBOL_EXISTS(), |
| # which does the same as CHECK_SYMBOL_EXISTS(), but in C++. |
| # |
| # The following variables may be set before calling this macro to |
| # modify the way the check is run: |
| # |
| # CMAKE_REQUIRED_FLAGS = string of compile command line flags |
| # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) |
| # CMAKE_REQUIRED_INCLUDES = list of include directories |
| # CMAKE_REQUIRED_LIBRARIES = list of libraries to link |
| |
| #============================================================================= |
| # Copyright 2003-2011 Kitware, Inc. |
| # |
| # Distributed under the OSI-approved BSD License (the "License"); |
| # see accompanying file Copyright.txt for details. |
| # |
| # This software is distributed WITHOUT ANY WARRANTY; without even the |
| # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| # See the License for more information. |
| #============================================================================= |
| # (To distribute this file outside of CMake, substitute the full |
| # License text for the above reference.) |
| |
| INCLUDE("${CMAKE_CURRENT_LIST_DIR}/CMakeExpandImportedTargets.cmake") |
| |
| |
| MACRO(CHECK_SYMBOL_EXISTS SYMBOL FILES VARIABLE) |
| _CHECK_SYMBOL_EXISTS("${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" "${SYMBOL}" "${FILES}" "${VARIABLE}" ) |
| ENDMACRO(CHECK_SYMBOL_EXISTS) |
| |
| MACRO(_CHECK_SYMBOL_EXISTS SOURCEFILE SYMBOL FILES VARIABLE) |
| IF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n") |
| SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS}) |
| IF(CMAKE_REQUIRED_LIBRARIES) |
| # this one translates potentially used imported library targets to their files on disk |
| CMAKE_EXPAND_IMPORTED_TARGETS(_ADJUSTED_CMAKE_REQUIRED_LIBRARIES LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} CONFIGURATION "${CMAKE_TRY_COMPILE_CONFIGURATION}") |
| SET(CHECK_SYMBOL_EXISTS_LIBS |
| "-DLINK_LIBRARIES:STRING=${_ADJUSTED_CMAKE_REQUIRED_LIBRARIES}") |
| ELSE(CMAKE_REQUIRED_LIBRARIES) |
| SET(CHECK_SYMBOL_EXISTS_LIBS) |
| ENDIF(CMAKE_REQUIRED_LIBRARIES) |
| IF(CMAKE_REQUIRED_INCLUDES) |
| SET(CMAKE_SYMBOL_EXISTS_INCLUDES |
| "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") |
| ELSE(CMAKE_REQUIRED_INCLUDES) |
| SET(CMAKE_SYMBOL_EXISTS_INCLUDES) |
| ENDIF(CMAKE_REQUIRED_INCLUDES) |
| FOREACH(FILE ${FILES}) |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n") |
| ENDFOREACH(FILE) |
| SET(CMAKE_CONFIGURABLE_FILE_CONTENT |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nint main(int argc, char** argv)\n{\n (void)argv;\n#ifndef ${SYMBOL}\n return ((int*)(&${SYMBOL}))[argc];\n#else\n (void)argc;\n return 0;\n#endif\n}\n") |
| |
| CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in" |
| "${SOURCEFILE}" @ONLY IMMEDIATE) |
| |
| MESSAGE(STATUS "Looking for ${SYMBOL}") |
| TRY_COMPILE(${VARIABLE} |
| ${CMAKE_BINARY_DIR} |
| "${SOURCEFILE}" |
| COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} |
| CMAKE_FLAGS |
| -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS} |
| "${CHECK_SYMBOL_EXISTS_LIBS}" |
| "${CMAKE_SYMBOL_EXISTS_INCLUDES}" |
| OUTPUT_VARIABLE OUTPUT) |
| IF(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${SYMBOL} - found") |
| SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log |
| "Determining if the ${SYMBOL} " |
| "exist passed with the following output:\n" |
| "${OUTPUT}\nFile ${SOURCEFILE}:\n" |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") |
| ELSE(${VARIABLE}) |
| MESSAGE(STATUS "Looking for ${SYMBOL} - not found.") |
| SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}") |
| FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log |
| "Determining if the ${SYMBOL} " |
| "exist failed with the following output:\n" |
| "${OUTPUT}\nFile ${SOURCEFILE}:\n" |
| "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n") |
| ENDIF(${VARIABLE}) |
| ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$") |
| ENDMACRO(_CHECK_SYMBOL_EXISTS) |