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1 # - Check if a symbol exists as a function, variable, or macro
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2 # CHECK_SYMBOL_EXISTS(<symbol> <files> <variable>)
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3 #
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4 # Check that the <symbol> is available after including given header
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5 # <files> and store the result in a <variable>. Specify the list
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6 # of files in one argument as a semicolon-separated list.
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7 #
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8 # If the header files define the symbol as a macro it is considered
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9 # available and assumed to work. If the header files declare the
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10 # symbol as a function or variable then the symbol must also be
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11 # available for linking. If the symbol is a type or enum value
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12 # it will not be recognized (consider using CheckTypeSize or
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13 # CheckCSourceCompiles).
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14 #
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15 # The following variables may be set before calling this macro to
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16 # modify the way the check is run:
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17 #
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18 # CMAKE_REQUIRED_FLAGS = string of compile command line flags
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19 # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
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20 # CMAKE_REQUIRED_INCLUDES = list of include directories
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21 # CMAKE_REQUIRED_LIBRARIES = list of libraries to link
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22
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23 #=============================================================================
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24 # Copyright 2003-2011 Kitware, Inc.
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25 #
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26 # Distributed under the OSI-approved BSD License (the "License");
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27 # see accompanying file Copyright.txt for details.
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28 #
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29 # This software is distributed WITHOUT ANY WARRANTY; without even the
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30 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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31 # See the License for more information.
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32 #=============================================================================
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33 # (To distribute this file outside of CMake, substitute the full
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34 # License text for the above reference.)
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35
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36 MACRO(CHECK_SHARED_FUNCTION_EXISTS SYMBOL FILES LIBRARY LOCATION VARIABLE)
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37 IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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38 SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
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39 SET(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
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40 IF(CMAKE_REQUIRED_LIBRARIES)
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41 SET(CHECK_SYMBOL_EXISTS_LIBS
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42 "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES};${LIBRARY}")
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43 ELSE(CMAKE_REQUIRED_LIBRARIES)
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44 SET(CHECK_SYMBOL_EXISTS_LIBS
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45 "-DLINK_LIBRARIES:STRING=${LIBRARY}")
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46 ENDIF(CMAKE_REQUIRED_LIBRARIES)
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47 IF(CMAKE_REQUIRED_INCLUDES)
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48 SET(CMAKE_SYMBOL_EXISTS_INCLUDES
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49 "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
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50 ELSE(CMAKE_REQUIRED_INCLUDES)
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51 SET(CMAKE_SYMBOL_EXISTS_INCLUDES)
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52 ENDIF(CMAKE_REQUIRED_INCLUDES)
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53 FOREACH(FILE ${FILES})
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54 SET(CMAKE_CONFIGURABLE_FILE_CONTENT
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55 "${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")
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56 ENDFOREACH(FILE)
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57 SET(CMAKE_CONFIGURABLE_FILE_CONTENT
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58 "${CMAKE_CONFIGURABLE_FILE_CONTENT}\nvoid cmakeRequireSymbol(int dummy,...){(void)dummy;}\nint main()\n{\n cmakeRequireSymbol(0,&${SYMBOL});\n return 0;\n}\n")
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59
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60 CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
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61 "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c" @ONLY)
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62
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63 MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY}")
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64 TRY_COMPILE(${VARIABLE}
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65 ${CMAKE_BINARY_DIR}
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66 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c
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67 COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
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68 CMAKE_FLAGS
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69 -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
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70 -DLINK_DIRECTORIES:STRING=${LOCATION}
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71 "${CHECK_SYMBOL_EXISTS_LIBS}"
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72 "${CMAKE_SYMBOL_EXISTS_INCLUDES}"
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73 OUTPUT_VARIABLE OUTPUT)
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74 IF(${VARIABLE})
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75 MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - found")
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76 SET(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}")
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77 FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
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78 "Determining if the ${SYMBOL} "
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79 "exist in ${LIBRARY} passed with the following output:\n"
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80 "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
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81 "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
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82 ELSE(${VARIABLE})
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83 MESSAGE(STATUS "Looking for ${SYMBOL} in ${LIBRARY} - not found.")
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84 SET(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL} in ${LIBRARY}")
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85 FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
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86 "Determining if the ${SYMBOL} "
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87 "exist in ${LIBRARY} failed with the following output:\n"
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88 "${OUTPUT}\nFile ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckSymbolExists.c:\n"
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89 "${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
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90 ENDIF(${VARIABLE})
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91 ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
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92 ENDMACRO(CHECK_SHARED_FUNCTION_EXISTS)
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