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152 lines
7.5 KiB
152 lines
7.5 KiB
1 year ago
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# OS X requires a Mach-O dynamic library to have a baked "install name", that is used by other modules to link to it. Depending
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# on how the library is built, the install name is not always an absolute path, nor necessarily the same as the name of the
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# library file itself. This macro takes as input the name of a target, and a list of libraries that it links to (the output of
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# FIND_PACKAGE or FIND_LIBRARY calls), and generates a set of custom, post-build commands that, for each linked dylib, changes
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# the name the target uses to refer to it with a fully-qualified (absolute) version of the library's own install name. This
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# helps ensure that the target can be used from any location while still being able to locate the linked dynamic libraries.
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#
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# Note that this script does NOT handle the case when a linked library itself refers to another library using a non-absolute
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# name (Boost is a notorious example). To avoid such issues, it is recommended to use a static library instead of a shared one
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# in a non-standard location. Alternatively, set DYLD_LIBRARY_PATH to include these non-standard locations when running the
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# program (not recommended).
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#
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# Author: Siddhartha Chaudhuri, 2009.
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#
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# Set the minimum required CMake version
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CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
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# See cmake --help-policy CMP0011 for details on this one
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IF(POLICY CMP0011)
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CMAKE_POLICY(SET CMP0011 NEW)
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ENDIF(POLICY CMP0011)
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# See cmake --help-policy CMP0026 for details on this one
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IF(POLICY CMP0026)
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CMAKE_POLICY(SET CMP0026 NEW)
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ENDIF(POLICY CMP0026)
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# See cmake --help-policy CMP0045 for details on this one
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IF(POLICY CMP0045)
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CMAKE_POLICY(SET CMP0045 NEW)
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ENDIF(POLICY CMP0045)
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MACRO(OSX_FIX_DYLIB_REFERENCES target libraries)
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IF(APPLE)
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SET(OFIN_${target}_RPATHS )
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FOREACH(OFIN_${target}_Library ${libraries})
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IF(${OFIN_${target}_Library} MATCHES "[.]dylib$"
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OR ${OFIN_${target}_Library} MATCHES "[.]framework/.+")
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# Resolve symlinks and get absolute location
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GET_FILENAME_COMPONENT(OFIN_${target}_LibraryAbsolute ${OFIN_${target}_Library} ABSOLUTE)
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# Get the baked install name of the library
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EXECUTE_PROCESS(COMMAND otool -D ${OFIN_${target}_LibraryAbsolute}
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OUTPUT_VARIABLE OFIN_${target}_LibraryInstallNameOutput
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OUTPUT_STRIP_TRAILING_WHITESPACE)
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STRING(REGEX REPLACE "[\r\n]" " " OFIN_${target}_LibraryInstallNameOutput ${OFIN_${target}_LibraryInstallNameOutput})
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SEPARATE_ARGUMENTS(OFIN_${target}_LibraryInstallNameOutput)
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LIST(GET OFIN_${target}_LibraryInstallNameOutput 1 OFIN_${target}_LibraryInstallName)
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IF(${OFIN_${target}_LibraryInstallName} MATCHES "^[@]rpath/")
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# Ideally, we want to eliminate the longest common suffix of the install name and the absolute path. Whatever's left
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# will be the desired rpath. But this is difficult to do (especially if there are naming variations, e.g.
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# "Versions/Current" vs "Versions/5" is a common culprit). So we'll add various candidate rpaths and hope at least one
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# is correct.
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# Typically, the rpath to a library within a framework looks like this:
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# @rpath/A.framework/Versions/5/libFoo.dylib
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#
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# Hence, we'll extract for the path unit immediately following the @rpath (in this case A.framework) and then look for
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# it in the library's actual path. Everything before this location will be put in the rpath.
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SET(OFIN_${target}_PathPrefix ${OFIN_${target}_LibraryInstallName})
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SET(OFIN_${target}_RpathFirstChild )
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WHILE(NOT OFIN_${target}_PathPrefix STREQUAL "@rpath")
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GET_FILENAME_COMPONENT(OFIN_${target}_RpathFirstChild ${OFIN_${target}_PathPrefix} NAME)
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GET_FILENAME_COMPONENT(OFIN_${target}_PathPrefix ${OFIN_${target}_PathPrefix} PATH)
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IF(NOT OFIN_${target}_PathPrefix) # should never happen but just in case
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BREAK()
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ENDIF(NOT OFIN_${target}_PathPrefix)
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IF(OFIN_${target}_PathPrefix STREQUAL "/") # should never happen but just in case
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BREAK()
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ENDIF(OFIN_${target}_PathPrefix STREQUAL "/")
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ENDWHILE(NOT OFIN_${target}_PathPrefix STREQUAL "@rpath")
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IF(OFIN_${target}_RpathFirstChild)
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SET(OFIN_${target}_PathPrefix ${OFIN_${target}_LibraryAbsolute})
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SET(OFIN_${target}_PathUnit )
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WHILE(NOT OFIN_${target}_PathUnit STREQUAL ${OFIN_${target}_RpathFirstChild})
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GET_FILENAME_COMPONENT(OFIN_${target}_PathUnit ${OFIN_${target}_PathPrefix} NAME)
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GET_FILENAME_COMPONENT(OFIN_${target}_PathPrefix ${OFIN_${target}_PathPrefix} PATH)
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IF(NOT OFIN_${target}_PathPrefix)
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BREAK()
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ENDIF(NOT OFIN_${target}_PathPrefix)
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IF(OFIN_${target}_PathPrefix STREQUAL "/")
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BREAK()
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ENDIF(OFIN_${target}_PathPrefix STREQUAL "/")
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ENDWHILE(NOT OFIN_${target}_PathUnit STREQUAL ${OFIN_${target}_RpathFirstChild})
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IF(OFIN_${target}_PathPrefix)
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SET(OFIN_${target}_RPATHS ${OFIN_${target}_RPATHS} "${OFIN_${target}_PathPrefix}")
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ENDIF(OFIN_${target}_PathPrefix)
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ENDIF(OFIN_${target}_RpathFirstChild)
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# Add the directory containing the library
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GET_FILENAME_COMPONENT(OFIN_${target}_LibraryAbsolutePath ${OFIN_${target}_LibraryAbsolute} PATH)
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SET(OFIN_${target}_RPATHS ${OFIN_${target}_RPATHS} "${OFIN_${target}_LibraryAbsolutePath}")
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# Add paths specified as library search prefixes
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FOREACH(prefix ${CMAKE_PREFIX_PATH})
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SET(OFIN_${target}_RPATHS ${OFIN_${target}_RPATHS} "${CMAKE_PREFIX_PATH}")
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SET(OFIN_${target}_RPATHS ${OFIN_${target}_RPATHS} "${CMAKE_PREFIX_PATH}/lib")
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ENDFOREACH()
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ELSEIF(NOT ${OFIN_${target}_LibraryInstallName} MATCHES "^[@/]") # just a relative path
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# Replace the unqualified filename, if it appears, with the absolute location, either by directly changing the path or
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# by editing the rpath
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# -- handle the case when the actual filename is baked in
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GET_FILENAME_COMPONENT(OFIN_${target}_LibraryFilename ${OFIN_${target}_LibraryAbsolute} NAME)
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ADD_CUSTOM_COMMAND(TARGET ${target} POST_BUILD
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COMMAND install_name_tool
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ARGS -change
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${OFIN_${target}_LibraryFilename}
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${OFIN_${target}_LibraryAbsolute}
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$<TARGET_FILE:${target}>)
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# -- handle the case when the install name is baked in
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ADD_CUSTOM_COMMAND(TARGET ${target} POST_BUILD
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COMMAND install_name_tool
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ARGS -change
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${OFIN_${target}_LibraryInstallName}
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${OFIN_${target}_LibraryAbsolute}
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$<TARGET_FILE:${target}>)
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ENDIF()
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ENDIF()
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ENDFOREACH(OFIN_${target}_Library)
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# Add the collected rpaths
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IF(OFIN_${target}_RPATHS)
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LIST(REMOVE_DUPLICATES OFIN_${target}_RPATHS)
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FOREACH(rpath ${OFIN_${target}_RPATHS})
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ADD_CUSTOM_COMMAND(TARGET ${target} POST_BUILD
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COMMAND bash
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ARGS -c "install_name_tool -add_rpath '${rpath}' '$<TARGET_FILE:${target}>' > /dev/null 2>&1 || true"
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VERBATIM)
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ENDFOREACH()
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ENDIF()
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ENDIF()
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ENDMACRO(OSX_FIX_DYLIB_REFERENCES)
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