please be explicit, are you saying i should type exactly this:
./bjam macosx-version-min=10.4 architecture=combined linkflags="-Wl,-force_cpusubtype_ALL" --with-thread -a -n install
I don't know how to use bjam, nor do I have any wish to learn, so I can't help you with its command line arguments. Did doing that give you -Wl,-force_cpusubtype_ALL for the g++ command that creates libboost_thread.dylib?
apparently the extra -Wl is not necessary, since when i leave it off, it still gets sent, probably due to the macosx-min-version flag. WITH:
./bjam macosx-version-min=10.4 architecture=combined linkflags="-Wl -force_cpusubtype_ALL" --with-thread -a -n install
"g++" -dynamiclib -Wl,-single_module -install_name "libboost_thread.dylib" -o "bin.v2/libs/thread/build/darwin-4.2.1/ release/architecture-combined/macosx-version-min-10.4/threading-multi/ libboost_thread.dylib" "bin.v2/libs/thread/build/darwin-4.2.1/release/ architecture-combined/macosx-version-min-10.4/threading-multi/pthread/ thread.o" "bin.v2/libs/thread/build/darwin-4.2.1/release/architecture- combined/macosx-version-min-10.4/threading-multi/pthread/exceptions.o" "bin.v2/libs/thread/build/darwin-4.2.1/release/architecture-combined/ macosx-version-min-10.4/threading-multi/pthread/once.o" - headerpad_max_install_names -mmacosx-version-min=10.4 -Wl,-dead_strip - no_dead_strip_inits_and_terms -arch i386 -arch ppc -Wl - force_cpusubtype_ALL note: see it's in there TWICE? is the problem that i'm missing a comma? WITHOUT:
./bjam macosx-version-min=10.4 architecture=combined linkflags="- force_cpusubtype_ALL" --with-thread -a -n install
"g++" -dynamiclib -Wl,-single_module -install_name "libboost_thread.dylib" -o "bin.v2/libs/thread/build/darwin-4.2.1/ release/architecture-combined/macosx-version-min-10.4/threading-multi/ libboost_thread.dylib" "bin.v2/libs/thread/build/darwin-4.2.1/release/ architecture-combined/macosx-version-min-10.4/threading-multi/pthread/ thread.o" "bin.v2/libs/thread/build/darwin-4.2.1/release/architecture- combined/macosx-version-min-10.4/threading-multi/pthread/exceptions.o" "bin.v2/libs/thread/build/darwin-4.2.1/release/architecture-combined/ macosx-version-min-10.4/threading-multi/pthread/once.o" - headerpad_max_install_names -mmacosx-version-min=10.4 -Wl,-dead_strip - no_dead_strip_inits_and_terms -arch i386 -arch ppc -force_cpusubtype_ALL