khanat-code-old/code/CMakeModules/CheckDepends.cmake

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# Macros to check if a library needs to be manually linked to another one
# because it's using a symbol from it but it's not linked to
#
# Syntax:
# CHECK_DEPENDS(MYLIBRARY OTHERLIBRARY SYMBOL MUSTLINK)
#
# Sets the following variables:
# XYZ_LIBRARY_MUSTLINK
#
# Example:
# Check if we need to explicitly link to libz with libpng
# CHECK_DEPENDS(PNG_LIBRARY ZLIB_LIBRARY inflate)
# objdump -p /usr/lib/libwwwxml.so | grep expat
# objdump -T /usr/lib/libwwwxml.so | grep "*UND*" | grep XML_ParserCreate
# objdump -p <lib> | grep <libray>
# objdump -T <lib> | grep "*UND*" | grep <function>
#
# CHECK_UNDEFINED_SYMBOL
# Macro to check if a library is calling an undefined symbol
#
# Syntax:
# CHECK_UNDEFINED_SYMBOL(MYLIBRARY SYMBOL SYMBOL_FOUND)
# SYMBOL_FOUND will be set to TRUE or FALSE
#
# Example:
# CHECK_UNDEFINED_SYMBOL(PNG_LIBRARY inflate INFLATE_FOUND)
#
MACRO(CHECK_UNDEFINED_SYMBOL MYLIBRARY SYMBOL SYMBOL_FOUND)
SET(${SYMBOL_FOUND} TRUE)
IF(WIN32)
# Always TRUE under Windows because we are using static libraries
ELSEIF(APPLE)
# TODO: use otool to detect if a library is using a symbol
ELSEIF(UNIX)
IF(CMAKE_OBJDUMP)
# Use objdump to check if a library is using an external symbol
EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-T ${MYLIBRARY} | grep ${SYMBOL}" OUTPUT_VARIABLE OBJDUMP_SYMBOL)
message(STATUS "OBJDUMP_SYMBOL = ${OBJDUMP_SYMBOL}")
IF(NOT OBJDUMP_SYMBOL MATCHES "UND")
SET(${SYMBOL_FOUND} FALSE)
ENDIF(OBJDUMP_SYMBOL MATCHES "UND")
ENDIF(CMAKE_OBJDUMP)
ENDIF(WIN32)
ENDMACRO(CHECK_UNDEFINED_SYMBOL)
MACRO(CHECK_LINKED_LIBRARY MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
SET(${LIBRARY_FOUND} FALSE)
IF(WIN32)
# Always FALSE under Windows because we are using static libraries
ELSEIF(APPLE)
# TODO: use otool to detect if a library is using a symbol
ELSEIF(UNIX)
IF(CMAKE_OBJDUMP)
# Use objdump to check if a library is linked to another library
EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-p ${MYLIBRARY} | grep ${OTHERLIBRARY}" OUTPUT_VARIABLE OBJDUMP_LIBRARY)
IF(OBJDUMP_LIBRARY MATCHES "NEEDED")
SET(${LIBRARY_FOUND} TRUE)
ENDIF(OBJDUMP_LIBRARY MATCHES "NEEDED")
ENDIF(CMAKE_OBJDUMP)
ENDIF(WIN32)
ENDMACRO(CHECK_LINKED_LIBRARY)
MACRO(CHECK_DEPENDS MYLIBRARY OTHERLIBRARY SYMBOL MUSTLINK)
CHECK_UNDEFINED_SYMBOL(MYLIBRARY SYMBOL SYMBOL_FOUND)
IF(SYMBOL_FOUND)
CHECK_LINKED_LIBRARY(MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
ENDIF(SYMBOL_FOUND)
IF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
SET(${MUSTLINK} YES)
ELSE(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
SET(${MUSTLINK} NO)
ENDIF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
ENDMACRO(CHECK_DEPENDS)
MACRO(LINK_DEPENDS LIBRARIES MYLIBRARY OTHERLIBRARY SYMBOL)
SET(MUST_LINK FALSE)
IF(${MYLIBRARY} AND ${OTHERLIBRARY} AND NOT ${OTHERLIBRARY}_LINKED)
IF(WIN32 OR WITH_STATIC)
# In static, we link all libraries because it will keep only used symbols
SET(MUST_LINK TRUE)
ELSE(WIN32 OR WITH_STATIC)
CHECK_UNDEFINED_SYMBOL(${MYLIBRARY} ${SYMBOL} SYMBOL_FOUND)
IF(SYMBOL_FOUND)
CHECK_LINKED_LIBRARY(${MYLIBRARY} ${OTHERLIBRARY} LIBRARY_FOUND)
ENDIF(SYMBOL_FOUND)
# CHECK_DEPENDS(${MYLIBRARY} ${${OTHERLIBRARY}} ${SYMBOL} MUST_LINK)
IF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
MESSAGE(STATUS "Underlinking found: ${${MYLIBRARY}} needs ${${OTHERLIBRARY}} but is not linked to, manually linking...")
SET(MUST_LINK TRUE)
ENDIF(SYMBOL_FOUND AND NOT LIBRARY_FOUND)
ENDIF(WIN32 OR WITH_STATIC)
ENDIF(${MYLIBRARY} AND ${OTHERLIBRARY} AND NOT ${OTHERLIBRARY}_LINKED)
IF(MUST_LINK)
MESSAGE(STATUS "Linking with ${${OTHERLIBRARY}}")
SET(${OTHERLIBRARY}_LINKED TRUE)
SET(${LIBRARIES} ${${LIBRARIES}} ${${OTHERLIBRARY}})
ENDIF(MUST_LINK)
ENDMACRO(LINK_DEPENDS)