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OS X: Detect implicit link directories on modern toolchains

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We detect the implicit link directories for the toolchain by adding a
flag to get verbose output from the compiler front-end while linking the
ABI detection binary.  Newer OS X toolchains based on Clang do not add
the implicit link directories with -L options to their internal
invocation of "ld".  Instead they use a linker that comes with the
toolchain and is already configured with the proper directories.

Add the "-Wl,-v" option to ask "ld" to print its implicit directories.
It displays them in a block such as:

 Library search paths:
	/...

Parse this block to extract the implicit link directories.

While at it, remove the checks introduced by commit efaf335b (Skip
implicit link information on Xcode, 2009-07-23) and commit 5195a664
(Skip implicit link info for multiple OS X archs, 2009-09-22).  Discard
the non-system link directories added by Xcode.  Discard all detected
implicit libraries in the multi-architecture case but keep the
directories.  The directories are still useful without the libraries
just to suppress addition of explicit -L options for them.
This commit is contained in:
Brad King
2012-12-05 11:49:13 -05:00
parent ba58d0c06f
commit 2dd67c7ea0
5 changed files with 134 additions and 15 deletions
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1
Modules/Platform/Darwin-Clang.cmake
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@@ -19,6 +19,7 @@ endif()
set(__DARWIN_COMPILER_CLANG 1)
macro(__darwin_compiler_clang lang)
set(CMAKE_${lang}_VERBOSE_FLAG "-v -Wl,-v") # also tell linker to print verbose output
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-dynamiclib -Wl,-headerpad_max_install_names")
set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS "-bundle -Wl,-headerpad_max_install_names")
set(CMAKE_${lang}_SYSROOT_FLAG "-isysroot")

1
Modules/Platform/Darwin-GNU.cmake
View File

@@ -19,6 +19,7 @@ endif()
set(__DARWIN_COMPILER_GNU 1)
macro(__darwin_compiler_gnu lang)
set(CMAKE_${lang}_VERBOSE_FLAG "-v -Wl,-v") # also tell linker to print verbose output
# GNU does not have -shared on OS X
set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-dynamiclib -Wl,-headerpad_max_install_names")
set(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS "-bundle -Wl,-headerpad_max_install_names")