OS X: Detect implicit link directories on modern toolchains

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.

1 files changed, 97 insertions, 0 deletions

diff --git a/Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in b/Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in
index dbe9500..0296304 100644
--- a/Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in
+++ b/Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in
@@ -102,30 +102,127 @@ list(APPEND platforms linux64_test1)
 #-----------------------------------------------------------------------------
 # Mac
 
+# gcc -arch i686 dummy.c -v -Wl,-v
+set(mac_i686_gcc_Wlv_text " /usr/libexec/gcc/i686-apple-darwin10/4.2.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccnhXAGL.o -lSystem -lgcc -lSystem
+collect2 version 4.2.1 (Apple Inc. build 5646) (i686 Darwin)
+/usr/libexec/gcc/i686-apple-darwin10/4.2.1/ld -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccSiuUhD.o -v -lSystem -lgcc -lSystem
+@(#)PROGRAM:ld  PROJECT:ld64-95.2.12
+Library search paths:
+	/usr/lib/i686-apple-darwin10/4.2.1
+	/usr/lib/gcc/i686-apple-darwin10/4.2.1
+	/usr/lib/gcc/i686-apple-darwin10/4.2.1
+	/usr/lib/i686-apple-darwin10/4.2.1
+	/usr/lib
+	/usr/lib
+	/usr/local/lib
+Framework search paths:
+	/Library/Frameworks/
+	/System/Library/Frameworks/")
+set(mac_i686_gcc_Wlv_libs "")
+set(mac_i686_gcc_Wlv_dirs "/usr/lib/i686-apple-darwin10/4.2.1;/usr/lib/gcc/i686-apple-darwin10/4.2.1;/usr/lib;/usr/local/lib")
+list(APPEND platforms mac_i686_gcc_Wlv)
+
 # gcc -arch i686 dummy.c -v
 set(mac_i686_gcc_text " /usr/libexec/gcc/i686-apple-darwin10/4.2.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccnhXAGL.o -lSystem -lgcc -lSystem")
 set(mac_i686_gcc_libs "")
 set(mac_i686_gcc_dirs "/usr/lib/i686-apple-darwin10/4.2.1;/usr/lib/gcc/i686-apple-darwin10/4.2.1;/usr/lib")
 list(APPEND platforms mac_i686_gcc)
 
+# g++ -arch i686 dummy.cxx -v -Wl,-v
+set(mac_i686_g++_Wlv_text " /usr/libexec/gcc/i686-apple-darwin10/4.2.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccEXXICh.o -lstdc++ -lSystem -lgcc -lSystem
+collect2 version 4.2.1 (Apple Inc. build 5646) (i686 Darwin)
+/usr/libexec/gcc/i686-apple-darwin10/4.2.1/ld -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccWrBoVl.o -v -lstdc++ -lSystem -lgcc -lSystem
+@(#)PROGRAM:ld  PROJECT:ld64-95.2.12
+Library search paths:
+	/usr/lib/i686-apple-darwin10/4.2.1
+	/usr/lib/gcc/i686-apple-darwin10/4.2.1
+	/usr/lib/gcc/i686-apple-darwin10/4.2.1
+	/usr/lib/i686-apple-darwin10/4.2.1
+	/usr/lib
+	/usr/lib
+	/usr/local/lib
+Framework search paths:
+	/Library/Frameworks/
+	/System/Library/Frameworks/")
+set(mac_i686_g++_Wlv_libs "stdc++")
+set(mac_i686_g++_Wlv_dirs "/usr/lib/i686-apple-darwin10/4.2.1;/usr/lib/gcc/i686-apple-darwin10/4.2.1;/usr/lib;/usr/local/lib")
+list(APPEND platforms mac_i686_g++_Wlv)
+
 # g++ -arch i686 dummy.cxx -v
 set(mac_i686_g++_text " /usr/libexec/gcc/i686-apple-darwin10/4.2.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.6.o -L/usr/lib/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../../i686-apple-darwin10/4.2.1 -L/usr/lib/gcc/i686-apple-darwin10/4.2.1/../../.. /var/tmp//ccEXXICh.o -lstdc++ -lSystem -lgcc -lSystem")
 set(mac_i686_g++_libs "stdc++")
 set(mac_i686_g++_dirs "/usr/lib/i686-apple-darwin10/4.2.1;/usr/lib/gcc/i686-apple-darwin10/4.2.1;/usr/lib")
 list(APPEND platforms mac_i686_g++)
 
+# gfortran dummy.f -v -Wl,-v
+set(mac_i686_gfortran_Wlv_text " /usr/local/libexec/gcc/i386-apple-darwin9.7.0/4.4.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1 -L/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1/../../.. /var/tmp//cc9zXNax.o -v -lgfortranbegin -lgfortran -lgcc_s.10.5 -lgcc -lSystem
+collect2 version 4.4.1 20090623 (prerelease) (i686 Darwin)
+/usr/bin/ld -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1 -L/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1/../../.. /var/tmp//cc9zXNax.o -v -lgfortranbegin -lgfortran -lgcc_s.10.5 -lgcc -lSystem
+@(#)PROGRAM:ld  PROJECT:ld64-95.2.12
+Library search paths:
+	/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1
+	/usr/local/lib
+	/usr/lib
+	/usr/local/lib
+Framework search paths:
+	/Library/Frameworks/
+	/System/Library/Frameworks/")
+set(mac_i686_gfortran_Wlv_libs "gfortranbegin;gfortran")
+set(mac_i686_gfortran_Wlv_dirs "/usr/local/lib/gcc/i386-apple-darwin9.7.0/4.4.1;/usr/local/lib;/usr/lib")
+list(APPEND platforms mac_i686_gfortran_Wlv)
+
 # gfortran dummy.f -v
 set(mac_i686_gfortran_text " /usr/libexec/gcc/i386-apple-darwin9.7.0/4.4.1/collect2 -dynamic -arch i386 -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/gcc/i386-apple-darwin9.7.0/4.4.1 -L/usr/lib/gcc -L/usr/lib/gcc/i386-apple-darwin9.7.0/4.4.1/../../.. /var/tmp//ccgqbX5P.o -lgfortranbegin -lgfortran -lgcc_s.10.5 -lgcc -lSystem")
 set(mac_i686_gfortran_libs "gfortranbegin;gfortran")
 set(mac_i686_gfortran_dirs "/usr/lib/gcc/i386-apple-darwin9.7.0/4.4.1;/usr/lib/gcc;/usr/lib")
 list(APPEND platforms mac_i686_gfortran)
 
+# gcc -arch ppc dummy.c -v -Wl,-v
+set(mac_ppc_gcc_Wlv_text " /usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/collect2 -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//cclziQY4.o -v -lgcc -lSystemStubs -lSystem
+collect2 version 4.2.1 (Apple Inc. build 5646) (Darwin/PowerPC)
+/usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/ld -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//cclziQY4.o -v -lgcc -lSystemStubs -lSystem
+@(#)PROGRAM:ld  PROJECT:ld64-95.2.12
+Library search paths:
+	/usr/lib/powerpc-apple-darwin10/4.2.1
+	/usr/lib/gcc/powerpc-apple-darwin10/4.2.1
+	/usr/lib/gcc/powerpc-apple-darwin10/4.2.1
+	/usr/lib/powerpc-apple-darwin10/4.2.1
+	/usr/lib
+	/usr/lib
+	/usr/local/lib
+Framework search paths:
+	/Library/Frameworks/
+	/System/Library/Frameworks/")
+set(mac_ppc_gcc_Wlv_libs "")
+set(mac_ppc_gcc_Wlv_dirs "/usr/lib/powerpc-apple-darwin10/4.2.1;/usr/lib/gcc/powerpc-apple-darwin10/4.2.1;/usr/lib;/usr/local/lib")
+list(APPEND platforms mac_ppc_gcc_Wlv)
+
 # gcc -arch ppc dummy.c -v
 set(mac_ppc_gcc_text " /usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/collect2 -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//ccdcolsP.o -lgcc -lSystemStubs -lSystem")
 set(mac_ppc_gcc_libs "")
 set(mac_ppc_gcc_dirs "/usr/lib/powerpc-apple-darwin10/4.2.1;/usr/lib/gcc/powerpc-apple-darwin10/4.2.1;/usr/lib")
 list(APPEND platforms mac_ppc_gcc)
 
+# g++ -arch ppc dummy.cxx -v -Wl,-v
+set(mac_ppc_g++_Wlv_text " /usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/collect2 -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//ccaFTkwq.o -v -lstdc++ -lgcc -lSystemStubs -lSystem
+collect2 version 4.2.1 (Apple Inc. build 5646) (Darwin/PowerPC)
+/usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/ld -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//ccaFTkwq.o -v -lstdc++ -lgcc -lSystemStubs -lSystem
+@(#)PROGRAM:ld  PROJECT:ld64-95.2.12
+Library search paths:
+	/usr/lib/powerpc-apple-darwin10/4.2.1
+	/usr/lib/gcc/powerpc-apple-darwin10/4.2.1
+	/usr/lib/gcc/powerpc-apple-darwin10/4.2.1
+	/usr/lib/powerpc-apple-darwin10/4.2.1
+	/usr/lib
+	/usr/lib
+	/usr/local/lib
+Framework search paths:
+	/Library/Frameworks/
+	/System/Library/Frameworks/")
+set(mac_ppc_g++_Wlv_libs "stdc++")
+set(mac_ppc_g++_Wlv_dirs "/usr/lib/powerpc-apple-darwin10/4.2.1;/usr/lib/gcc/powerpc-apple-darwin10/4.2.1;/usr/lib;/usr/local/lib")
+list(APPEND platforms mac_ppc_g++_Wlv)
+
 # g++ -arch ppc dummy.cxx -v
 set(mac_ppc_g++_text " /usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/collect2 -dynamic -arch ppc -macosx_version_min 10.6.0 -weak_reference_mismatches non-weak -o a.out -lcrt1.10.5.o -L/usr/lib/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../../powerpc-apple-darwin10/4.2.1 -L/usr/lib/gcc/powerpc-apple-darwin10/4.2.1/../../.. /var/tmp//ccbjB6Lj.o -lstdc++ -lgcc -lSystemStubs -lSystem")
 set(mac_ppc_g++_libs "stdc++")