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104 lines
3.8 KiB
CMake
104 lines
3.8 KiB
CMake
14 years ago
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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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#
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# Syntax:
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# CHECK_DEPENDS(MYLIBRARY OTHERLIBRARY SYMBOL MUSTLINK)
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#
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# Sets the following variables:
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# XYZ_LIBRARY_MUSTLINK
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#
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# Example:
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# Check if we need to explicitly link to libz with libpng
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# CHECK_DEPENDS(PNG_LIBRARY ZLIB_LIBRARY inflate)
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# objdump -p /usr/lib/libwwwxml.so | grep expat
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# objdump -T /usr/lib/libwwwxml.so | grep "*UND*" | grep XML_ParserCreate
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# objdump -p <lib> | grep <libray>
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# objdump -T <lib> | grep "*UND*" | grep <function>
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#
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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 or FALSE
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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(${SYMBOL_FOUND} TRUE)
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IF(WIN32)
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# Always TRUE under Windows because we are using static libraries
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ELSEIF(APPLE)
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# TODO: use otool to detect if a library is using a symbol
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ELSEIF(UNIX)
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IF(CMAKE_OBJDUMP)
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# Use objdump to check if a library is using an external symbol
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EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-T ${MYLIBRARY} | grep ${SYMBOL}" OUTPUT_VARIABLE OBJDUMP_SYMBOL)
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message(STATUS "OBJDUMP_SYMBOL = ${OBJDUMP_SYMBOL}")
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IF(NOT OBJDUMP_SYMBOL MATCHES "UND")
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SET(${SYMBOL_FOUND} FALSE)
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ENDIF(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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MACRO(CHECK_LINKED_LIBRARY MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
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SET(${LIBRARY_FOUND} FALSE)
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IF(WIN32)
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# Always FALSE under Windows because we are using static libraries
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ELSEIF(APPLE)
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# TODO: use otool to detect if a library is using a symbol
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ELSEIF(UNIX)
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IF(CMAKE_OBJDUMP)
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# Use objdump to check if a library is linked to another library
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EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-p ${MYLIBRARY} | grep ${OTHERLIBRARY}" OUTPUT_VARIABLE OBJDUMP_LIBRARY)
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IF(OBJDUMP_LIBRARY MATCHES "NEEDED")
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SET(${LIBRARY_FOUND} TRUE)
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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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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} ${OTHERLIBRARY} LIBRARY_FOUND)
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ENDIF(SYMBOL_FOUND)
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# CHECK_DEPENDS(${MYLIBRARY} ${${OTHERLIBRARY}} ${SYMBOL} MUST_LINK)
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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(${OTHERLIBRARY}_LINKED TRUE)
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SET(${LIBRARIES} ${${LIBRARIES}} ${${OTHERLIBRARY}})
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ENDIF(MUST_LINK)
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ENDMACRO(LINK_DEPENDS)
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