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OS X: Detect implicit linker framework search paths

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Previously we hard-coded a list of implicit framework directories but
did not account for CMAKE_OSX_SYSROOT or for changes to the list across
OS X versions.  Instead we should automatically detect the framework
directories for the active toolchain.

The parent commit added the "-Wl,-v" option to ask "ld" to print its
implicit directories.  It displays a block such as:

 Framework search paths:
	/...

Parse this block to extract the list of framework directories.

Detection may fail on toolchains that do not list their framework
directories, such as older OS X linkers.  Always treat the paths

 <sdk>/Library/Frameworks
 <sdk>/System/Library/Frameworks
 <sdk>/Network/Library/Frameworks # Older OS X only
 /System/Library/Frameworks

as implicit.  Note that /System/Library/Frameworks should always be
considered implicit so that frameworks CMake finds there will not
override the SDK copies.
This commit is contained in:
Brad King
2012-12-05 13:46:04 -05:00
parent 2dd67c7ea0
commit cc676c3a08
10 changed files with 94 additions and 22 deletions
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Modules/Platform/Darwin.cmake
+18
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@@ -256,6 +256,24 @@ set(CMAKE_CXX_CREATE_MACOSX_FRAMEWORK
if(NOT DEFINED CMAKE_FIND_FRAMEWORK)
set(CMAKE_FIND_FRAMEWORK FIRST)
endif()
# Older OS X linkers do not report their framework search path
# with -v but "man ld" documents the following locations.
set(CMAKE_PLATFORM_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES
${_CMAKE_OSX_SYSROOT_PATH}/Library/Frameworks
${_CMAKE_OSX_SYSROOT_PATH}/System/Library/Frameworks
)
if(_CMAKE_OSX_SYSROOT_PATH)
# Treat some paths as implicit so we do not override the SDK versions.
list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES
/System/Library/Frameworks)
endif()
if("${_CURRENT_OSX_VERSION}" VERSION_LESS "10.5")
# Older OS X tools had more implicit paths.
list(APPEND CMAKE_PLATFORM_IMPLICIT_LINK_FRAMEWORK_DIRECTORIES
${_CMAKE_OSX_SYSROOT_PATH}/Network/Library/Frameworks)
endif()
# set up the default search directories for frameworks
set(CMAKE_SYSTEM_FRAMEWORK_PATH
~/Library/Frameworks