139 lines
5.5 KiB
CMake
139 lines
5.5 KiB
CMake
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# Macros to check if a library needs to be manually linked to another one
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# because it's using a symbol from it but it's not linked to
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# CHECK_UNDEFINED_SYMBOL
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# Macro to check if a library is calling an undefined symbol
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#
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# Syntax:
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# CHECK_UNDEFINED_SYMBOL(MYLIBRARY SYMBOL SYMBOL_FOUND)
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# SYMBOL_FOUND will be set to TRUE if UNDEFINED
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#
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# Example:
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# CHECK_UNDEFINED_SYMBOL(PNG_LIBRARY inflate INFLATE_FOUND)
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#
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MACRO(CHECK_UNDEFINED_SYMBOL MYLIBRARY SYMBOL SYMBOL_FOUND)
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SET(${SYMBOL_FOUND} TRUE)
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IF(WIN32)
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# Always TRUE under Windows because we are using static libraries
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ELSEIF(APPLE)
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SET(CMAKE_NM nm)
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IF(CMAKE_NM)
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# Use nm to check if a library is using an external symbol
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EXEC_PROGRAM(${CMAKE_NM} ARGS "-gu ${${MYLIBRARY}} | grep ${SYMBOL}" OUTPUT_VARIABLE NM_SYMBOL)
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# MESSAGE(STATUS "Checking for undefined symbol ${SYMBOL} in ${${MYLIBRARY}}")
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IF(NOT NM_SYMBOL MATCHES ${SYMBOL})
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SET(${SYMBOL_FOUND} FALSE)
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# MESSAGE(STATUS "Defined symbol ${SYMBOL} detected in ${${MYLIBRARY}}")
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ENDIF(NOT NM_SYMBOL MATCHES ${SYMBOL})
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ENDIF(CMAKE_NM)
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ELSEIF(UNIX)
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SET(CMAKE_OBJDUMP objdump)
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IF(CMAKE_OBJDUMP)
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# Use objdump to check if a library is using an external symbol
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#MESSAGE(STATUS "exec ${CMAKE_OBJDUMP} -T ${${MYLIBRARY}} | grep ${SYMBOL}")
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EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-T ${${MYLIBRARY}} | grep ${SYMBOL}" OUTPUT_VARIABLE OBJDUMP_SYMBOL)
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IF(NOT OBJDUMP_SYMBOL MATCHES "UND")
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#MESSAGE(STATUS "${${MYLIBRARY}} does not use symbol ${SYMBOL}")
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SET(${SYMBOL_FOUND} FALSE)
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ELSE(NOT OBJDUMP_SYMBOL MATCHES "UND")
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#MESSAGE(STATUS "${${MYLIBRARY}} uses symbol ${SYMBOL}")
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ENDIF(NOT OBJDUMP_SYMBOL MATCHES "UND")
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ENDIF(CMAKE_OBJDUMP)
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ENDIF(WIN32)
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ENDMACRO(CHECK_UNDEFINED_SYMBOL)
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# CHECK_LINKED_LIBRARY
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# Macro to check if a library is linked to another one
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#
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# Syntax:
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# CHECK_LINKED_LIBRARY(MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
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# LIBRARY_FOUND will be set to TRUE if LINKED
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#
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# Example:
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# CHECK_LINKED_LIBRARY(PNG_LIBRARY ZLIB_LIBRARY ZLIB_FOUND)
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#
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MACRO(CHECK_LINKED_LIBRARY MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
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SET(${LIBRARY_FOUND} FALSE)
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IF(WIN32)
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# Always FALSE under Windows because we are using static libraries
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ELSEIF(APPLE)
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SET(CMAKE_OTOOL otool)
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IF(CMAKE_OTOOL)
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# Use otool to check if a library is linked to another library
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GET_FILENAME_COMPONENT(LIBNAME "${${OTHERLIBRARY}}" NAME_WE)
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EXEC_PROGRAM(${CMAKE_OTOOL} ARGS "-L ${${MYLIBRARY}} | grep ${LIBNAME}" OUTPUT_VARIABLE OTOOL_LIBRARY)
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# MESSAGE(STATUS "Checking if ${LIBNAME} is linked to ${${MYLIBRARY}}")
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IF(OTOOL_LIBRARY MATCHES "${LIBNAME}")
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SET(${LIBRARY_FOUND} TRUE)
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# MESSAGE(STATUS "Library ${LIBNAME} already linked to ${${MYLIBRARY}}")
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ENDIF(OTOOL_LIBRARY MATCHES "${LIBNAME}")
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ENDIF(CMAKE_OTOOL)
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ELSEIF(UNIX)
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SET(CMAKE_OBJDUMP objdump)
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IF(CMAKE_OBJDUMP)
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GET_FILENAME_COMPONENT(LIBNAME "${${OTHERLIBRARY}}" NAME)
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# TODO: under Solaris use dump -Lv <lib>
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# Use objdump to check if a library is linked to another library
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#MESSAGE(STATUS "exec ${CMAKE_OBJDUMP} -p ${${MYLIBRARY}} | grep ${LIBNAME}")
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EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-p ${${MYLIBRARY}} | grep ${LIBNAME}" OUTPUT_VARIABLE OBJDUMP_LIBRARY)
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IF(OBJDUMP_LIBRARY MATCHES "NEEDED")
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#MESSAGE(STATUS "${${MYLIBRARY}} references to ${LIBNAME}.")
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SET(${LIBRARY_FOUND} TRUE)
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ELSE(OBJDUMP_LIBRARY MATCHES "NEEDED")
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#MESSAGE(STATUS "${${MYLIBRARY}} does not reference to ${LIBNAME}!")
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ENDIF(OBJDUMP_LIBRARY MATCHES "NEEDED")
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ENDIF(CMAKE_OBJDUMP)
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ENDIF(WIN32)
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ENDMACRO(CHECK_LINKED_LIBRARY)
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MACRO(CHECK_DEPENDS MYLIBRARY OTHERLIBRARY SYMBOL MUSTLINK)
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CHECK_UNDEFINED_SYMBOL(MYLIBRARY SYMBOL SYMBOL_FOUND)
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IF(SYMBOL_FOUND)
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CHECK_LINKED_LIBRARY(MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
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ENDIF(SYMBOL_FOUND)
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IF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
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SET(${MUSTLINK} YES)
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ELSE(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
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SET(${MUSTLINK} NO)
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ENDIF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
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ENDMACRO(CHECK_DEPENDS)
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# LINK_DEPENDS
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# Macro to link a library if a symbol is used but is not already linked to it
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#
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# Syntax:
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# LINK_DEPENDS(LIBRARIES MYLIBRARY OTHERLIBRARY SYMBOL)
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# OTHERLIBRARY_LINKED will be set to TRUE or FALSE
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#
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# Example:
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# LINK_DEPENDS(PNG_LIBRARIES PNG_LIBRARY ZLIB_LIBRARY inflate)
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#
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MACRO(LINK_DEPENDS LIBRARIES MYLIBRARY OTHERLIBRARY SYMBOL)
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SET(MUST_LINK FALSE)
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IF(${MYLIBRARY} AND ${OTHERLIBRARY} AND NOT ${OTHERLIBRARY}_LINKED)
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IF(WIN32 OR WITH_STATIC)
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# In static, we link all libraries because it will keep only used symbols
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SET(MUST_LINK TRUE)
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ELSE(WIN32 OR WITH_STATIC)
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CHECK_UNDEFINED_SYMBOL(${MYLIBRARY} ${SYMBOL} SYMBOL_FOUND)
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IF(SYMBOL_FOUND)
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CHECK_LINKED_LIBRARY(${MYLIBRARY} ${OTHERLIBRARY} LIBRARY_FOUND)
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ENDIF(SYMBOL_FOUND)
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IF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
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MESSAGE(STATUS "Underlinking found: ${${MYLIBRARY}} needs ${${OTHERLIBRARY}} but is not linked to, manually linking...")
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SET(MUST_LINK TRUE)
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ENDIF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
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ENDIF(WIN32 OR WITH_STATIC)
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ENDIF(${MYLIBRARY} AND ${OTHERLIBRARY} AND NOT ${OTHERLIBRARY}_LINKED)
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IF(MUST_LINK)
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MESSAGE(STATUS "Linking with ${${OTHERLIBRARY}}")
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SET(${LIBRARIES} ${${LIBRARIES}} ${${OTHERLIBRARY}})
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SET(${OTHERLIBRARY}_LINKED TRUE)
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ENDIF(MUST_LINK)
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ENDMACRO(LINK_DEPENDS)
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