khanat-opennel-code/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
# 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 if UNDEFINED
#
# Example:
# CHECK_UNDEFINED_SYMBOL(PNG_LIBRARY inflate INFLATE_FOUND)
#
MACRO(CHECK_UNDEFINED_SYMBOL MYLIBRARY SYMBOL SYMBOL_FOUND)
SET(${SYMBOL_FOUND} TRUE)
IF(WIN32)
# Always TRUE under Windows because we are using static libraries
ELSEIF(APPLE)
SET(CMAKE_NM nm)
IF(CMAKE_NM)
# Use nm to check if a library is using an external symbol
EXEC_PROGRAM(${CMAKE_NM} ARGS "-gu ${${MYLIBRARY}} | grep ${SYMBOL}" OUTPUT_VARIABLE NM_SYMBOL)
MESSAGE(STATUS "Checking for undefined symbol ${SYMBOL} in ${${MYLIBRARY}}")
IF(NOT NM_SYMBOL MATCHES ${SYMBOL})
SET(${SYMBOL_FOUND} FALSE)
MESSAGE(STATUS "Defined symbol ${SYMBOL} detected in ${${MYLIBRARY}}")
ENDIF(NOT NM_SYMBOL MATCHES ${SYMBOL})
ENDIF(CMAKE_NM)
ELSEIF(UNIX)
IF(CMAKE_OBJDUMP)
# Use objdump to check if a library is using an external symbol
EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-T ${${MYLIBRARY}} | grep ${SYMBOL}" OUTPUT_VARIABLE OBJDUMP_SYMBOL)
IF(NOT OBJDUMP_SYMBOL MATCHES "UND")
SET(${SYMBOL_FOUND} FALSE)
ENDIF(NOT OBJDUMP_SYMBOL MATCHES "UND")
ENDIF(CMAKE_OBJDUMP)
ENDIF(WIN32)
ENDMACRO(CHECK_UNDEFINED_SYMBOL)
# CHECK_LINKED_LIBRARY
# Macro to check if a library is linked to another one
#
# Syntax:
# CHECK_LINKED_LIBRARY(MYLIBRARY OTHERLIBRARY LIBRARY_FOUND)
# LIBRARY_FOUND will be set to TRUE if LINKED
#
# Example:
# CHECK_LINKED_LIBRARY(PNG_LIBRARY ZLIB_LIBRARY ZLIB_FOUND)
#
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)
SET(CMAKE_OTOOL otool)
IF(CMAKE_OTOOL)
# Use otool to check if a library is linked to another library
GET_FILENAME_COMPONENT(LIBNAME ${${OTHERLIBRARY}} NAME_WE)
EXEC_PROGRAM(${CMAKE_OTOOL} ARGS "-L ${${MYLIBRARY}} | grep ${LIBNAME}" OUTPUT_VARIABLE OTOOL_LIBRARY)
MESSAGE(STATUS "Checking if ${LIBNAME} is linked to ${${MYLIBRARY}}")
IF(OTOOL_LIBRARY MATCHES "${LIBNAME}")
SET(${LIBRARY_FOUND} TRUE)
MESSAGE(STATUS "Library ${LIBNAME} already linked to ${${MYLIBRARY}}")
ENDIF(OTOOL_LIBRARY MATCHES "${LIBNAME}")
ENDIF(CMAKE_OTOOL)
ELSEIF(UNIX)
IF(CMAKE_OBJDUMP)
GET_FILENAME_COMPONENT(LIBNAME ${${OTHERLIBRARY}} NAME)
# TODO: under Solaris use dump -Lv <lib>
# Use objdump to check if a library is linked to another library
EXEC_PROGRAM(${CMAKE_OBJDUMP} ARGS "-p ${${MYLIBRARY}} | grep ${LIBNAME}" OUTPUT_VARIABLE OBJDUMP_LIBRARY)
IF(NOT OBJDUMP_LIBRARY MATCHES "NEEDED")
SET(${LIBRARY_FOUND} TRUE)
ENDIF(NOT 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)
# LINK_DEPENDS
# Macro to link a library if a symbol is used but is not already linked to it
#
# Syntax:
# LINK_DEPENDS(LIBRARIES MYLIBRARY OTHERLIBRARY SYMBOL)
# OTHERLIBRARY_LINKED will be set to TRUE or FALSE
#
# Example:
# LINK_DEPENDS(PNG_LIBRARIES PNG_LIBRARY ZLIB_LIBRARY inflate)
#
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)
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(${LIBRARIES} ${${LIBRARIES}} ${${OTHERLIBRARY}})
ENDIF(MUST_LINK)
# IF(LIBRARY_FOUND)
# SET(${OTHERLIBRARY}_LINKED TRUE)
# ENDIF(LIBRARY_FOUND)
ENDMACRO(LINK_DEPENDS)