It seems that the libtool command line may be wrong. Here's a simple test.
[descartes:~/programs] lucier% cat conftest.c int main2() { return 0;} [descartes:~/programs] lucier% gcc -m64 -mcpu=970 -o conftest -dynamiclib conftest.c -v -save-temps Using built-in specs. Target: powerpc-apple-darwin8.1.0 Configured with: ../configure --prefix=/pkgs/gcc-4.0-mainline --with-gmp=/pkgs/gmp-4.1.3 --with-mpfr=/pkgs/gmp-4.1.3 --enable-languages=c,c++,objc,obj-c++,f95 Thread model: posix gcc version 4.1.0 20050615 (experimental) /pkgs/gcc-4.0-mainline/libexec/gcc/powerpc-apple-darwin8.1.0/4.1.0/cc1 -E -quiet -v -D__DYNAMIC__ -D__APPLE_CC__=1 conftest.c -fPIC -m64 -mcpu=970 -fpch-preprocess -o conftest.i ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/../../../../powerpc-apple-darwin8.1.0/include" #include "..." search starts here: #include <...> search starts here: /pkgs/gcc-4.0-mainline/include /pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/include /usr/include /System/Library/Frameworks /Library/Frameworks End of search list. /pkgs/gcc-4.0-mainline/libexec/gcc/powerpc-apple-darwin8.1.0/4.1.0/cc1 -fpreprocessed conftest.i -fPIC -quiet -dumpbase conftest.c -m64 -mcpu=970 -auxbase conftest -version -o conftest.s GNU C version 4.1.0 20050615 (experimental) (powerpc-apple-darwin8.1.0) compiled by GNU C version 4.1.0 20050615 (experimental). GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 Compiler executable checksum: 856564be1b7d2e1a3d0c80ce3c26789d as -arch ppc64 -o conftest.o conftest.s /usr/bin/libtool -dynamic -arch_only ppc64 -noall_load -weak_reference_mismatches non-weak -o conftest -L/pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/ppc64 -L/pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/../../../ppc64 conftest.o -lgcc_s_ppc64 -lgcc -lSystemStubs -lmx -lSystem /usr/bin/libtool: can't locate file for: -lgcc_s_ppc64 /usr/bin/libtool: file: -lgcc_s_ppc64 is not an object file (not allowed in a library) However, if I add by hand /pkgs/gcc-4.0-mainline/lib, where libgcc_s_ppc64.1.0.dylib is installed, to the link path to libtool, I get [descartes:~/programs] lucier% /usr/bin/libtool -dynamic -arch_only ppc64 -noall_load -weak_reference_mismatches non-weak -o conftest -L/pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/ppc64 -L/pkgs/gcc-4.0-mainline/lib/gcc/powerpc-apple-darwin8.1.0/4.1.0/../../../ppc64 conftest.o -lgcc_s_ppc64 -lgcc -lSystemStubs -lmx -lSystem -L/pkgs/gcc-4.0-mainline/lib [descartes:~/programs] lucier% file conftest conftest: Mach-O 64-bit dynamically linked shared library ppc64 [descartes:~/programs] lucier% otool64 -L conftest conftest: conftest (compatibility version 0.0.0, current version 0.0.0) /pkgs/gcc-4.0-mainline/lib/libgcc_s_ppc64.1.0.dylib (compatibility version 1.0.0, current version 1.0.0) /usr/lib/libmx.A.dylib (compatibility version 1.0.0, current version 92.0.0) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 88.0.0) Compare the libtool command line from Xcode 2.1's gcc: [descartes:~/programs] lucier% /usr/bin/!! /usr/bin/gcc -m64 -mcpu=970 -o conftest -dynamiclib conftest.c -v -save-temps Using built-in specs. Target: powerpc-apple-darwin8 Configured with: /private/var/tmp/gcc/gcc-5026.obj~19/src/configure --disable-checking --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^+.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/gcc/darwin/4.0/c++ --build=powerpc-apple-darwin8 --host=powerpc-apple-darwin8 --target=powerpc-apple-darwin8 Thread model: posix gcc version 4.0.0 (Apple Computer, Inc. build 5026) /usr/libexec/gcc/powerpc-apple-darwin8/4.0.0/cc1 -E -quiet -v -D__DYNAMIC__ conftest.c -fPIC -m64 -mcpu=970 -fpch-preprocess -o conftest.i ignoring nonexistent directory "/usr/local/include" ignoring nonexistent directory "/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/../../../../powerpc-apple-darwin8/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/powerpc-apple-darwin8/4.0.0/include /usr/include /System/Library/Frameworks /Library/Frameworks End of search list. /usr/libexec/gcc/powerpc-apple-darwin8/4.0.0/cc1 -fpreprocessed conftest.i -fPIC -quiet -dumpbase conftest.c -m64 -mcpu=970 -auxbase conftest -version -o conftest.s GNU C version 4.0.0 (Apple Computer, Inc. build 5026) (powerpc-apple-darwin8) compiled by GNU C version 4.0.0 (Apple Computer, Inc. build 5026). GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 as -arch ppc64 -o conftest.o conftest.s /usr/bin/libtool -dynamic -arch_only ppc64 -noall_load -weak_reference_mismatches non-weak -o conftest -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/ppc64 -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0 -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/ppc64 -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0 -L/usr/lib/gcc/powerpc-apple-darwin8/4.0.0/../../.. conftest.o -lgcc_s_ppc64 -lgcc -lSystemStubs -lmx -lSystem In fact, libgcc_s_ppc64 is in $prefix/lib/gcc/powerpc-apple-darwin8.1/4.1.0/../../.. not $prefix/lib/gcc/powerpc-apple-darwin8.1/4.1.0/../../../ppc64 I have no clue about how to change the search paths for libtool. -- Summary: Wrong ld search paths passed to libtool for 64-bit compiles Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lucier at math dot purdue dot edu CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-apple-darwin8.1.0 GCC host triplet: powerpc-apple-darwin8.1.0 GCC target triplet: powerpc-apple-darwin8.1.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22110