Hopefully the right list … otherwise pointers appreciated (I’ve spent days trying to find a solution but could not find sufficient documentation, could not find a proper list of -flavor darwin commands) I am setting up an environment for cross compiling shared libraries using LLVM. Overall this works perfectly for many unix like environments but MacOS is a pain in the ass despite that I am running on MacOS. (I’ve not tried windows yet.) I seem to be able to compile with clang a proper mach object file for a hello function. However, when I link this function into a shared library I (surprisingly for a shared lib?) get undefined symbols like _printf, stub runtime: dyld_stub_binder, _main, etc. Using the flag -undefined dynamic_lookup I get no errors or warnings but then when I try to link the shared library to a main program I get the error: ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag but no LC_REEXPORT_DYLIB load commands: ./libhello.dylib file './libhello.dylib' I’ve included the shell file that makes the hello shared lib and the command that I use to link the file. Thanks for any help, this looks like an amazing solution if it can get to work on all supported platforms. Kind regards, Peter Kriens $ /usr/local/Cellar/llvm/4.0.0_1/bin/clang \ -target x86_64-apple-darwin16.5.0 \ -Ienvs/x86_64/apple/macos/darwin/16.5.0/include \ -v \ -nostdinc \ -fPIC \ -c \ -Wno-nullability-completeness \ hello.c x.c $ file hello.o hello.o: Mach-O 64-bit object x86_64 $ /usr/local/Cellar/llvm/4.0.0_1/bin/ld.lld \ -flavor darwin \ -v \ -sdk_version 10.5.0 \ -demangle \ -arch x86_64 \ -undefined dynamic_lookup \ -dylib \ -dynamic \ -o libhello.dylib \ hello.o $ file libhello.dylib libhello.dylib: Mach-O 64-bit dynamically linked shared library x86_64 $ gcc x.c -L. -lhello ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag but no LC_REEXPORT_DYLIB load commands: ./libhello.dylib file ‘./libhello.dylib' -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170427/0b9a894e/attachment.html>
Cc'ing people who are working on macOS. On Thu, Apr 27, 2017 at 9:05 AM, Peter Kriens via llvm-dev < llvm-dev at lists.llvm.org> wrote:> Hopefully the right list … otherwise pointers appreciated (I’ve spent days > trying to find a solution but could not find sufficient documentation, > could not find a proper list of -flavor darwin commands) > > I am setting up an environment for cross compiling shared libraries using > LLVM. Overall this works perfectly for many unix like environments but > MacOS is a pain in the ass despite that I am running on MacOS. (I’ve not > tried windows yet.) > > I seem to be able to compile with clang a proper mach object file for a > hello function. However, when I link this function into a shared library I > (surprisingly for a shared lib?) get undefined symbols like _printf, stub > runtime: dyld_stub_binder, _main, etc. Using the flag > > -undefined dynamic_lookup > > I get no errors or warnings but then when I try to link the shared library > to a main program I get the error: > > ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag > but no LC_REEXPORT_DYLIB load commands: ./libhello.dylib file > './libhello.dylib' > > I’ve included the shell file that makes the hello shared lib and the > command that I use to link the file. > > Thanks for any help, this looks like an amazing solution if it can get to > work on all supported platforms. > > Kind regards, > > Peter Kriens > > $ /usr/local/Cellar/llvm/4.0.0_1/bin/clang \ > -target x86_64-apple-darwin16.5.0 \ > -Ienvs/x86_64/apple/macos/darwin/16.5.0/include \ > -v \ > -nostdinc \ > -fPIC \ > -c \ > -Wno-nullability-completeness \ > hello.c x.c > > $ file hello.o > hello.o: Mach-O 64-bit object x86_64 > > $ /usr/local/Cellar/llvm/4.0.0_1/bin/ld.lld \ > -flavor darwin \ > -v \ > -sdk_version 10.5.0 \ > -demangle \ > -arch x86_64 \ > -undefined dynamic_lookup \ > -dylib \ > -dynamic \ > -o libhello.dylib \ > hello.o > > $ file libhello.dylib > libhello.dylib: Mach-O 64-bit dynamically linked shared library x86_64 > > $ gcc x.c -L. -lhello > ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag but no > LC_REEXPORT_DYLIB load commands: ./libhello.dylib file ‘./libhello.dylib' > > > > > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev > >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170427/561a9005/attachment.html>
LLD work on Darwin is stalled out at the moment. Patches are welcome (and I'll try to find time to review them), but I'd recommend ld64 for any real-world linking. - Lang. On Thu, Apr 27, 2017 at 11:06 AM, Rui Ueyama <ruiu at google.com> wrote:> Cc'ing people who are working on macOS. > > On Thu, Apr 27, 2017 at 9:05 AM, Peter Kriens via llvm-dev < > llvm-dev at lists.llvm.org> wrote: > >> Hopefully the right list … otherwise pointers appreciated (I’ve spent >> days trying to find a solution but could not find sufficient documentation, >> could not find a proper list of -flavor darwin commands) >> >> I am setting up an environment for cross compiling shared libraries using >> LLVM. Overall this works perfectly for many unix like environments but >> MacOS is a pain in the ass despite that I am running on MacOS. (I’ve not >> tried windows yet.) >> >> I seem to be able to compile with clang a proper mach object file for a >> hello function. However, when I link this function into a shared library I >> (surprisingly for a shared lib?) get undefined symbols like _printf, stub >> runtime: dyld_stub_binder, _main, etc. Using the flag >> >> -undefined dynamic_lookup >> >> I get no errors or warnings but then when I try to link the shared >> library to a main program I get the error: >> >> ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag >> but no LC_REEXPORT_DYLIB load commands: ./libhello.dylib file >> './libhello.dylib' >> >> I’ve included the shell file that makes the hello shared lib and the >> command that I use to link the file. >> >> Thanks for any help, this looks like an amazing solution if it can get to >> work on all supported platforms. >> >> Kind regards, >> >> Peter Kriens >> >> $ /usr/local/Cellar/llvm/4.0.0_1/bin/clang \ >> -target x86_64-apple-darwin16.5.0 \ >> -Ienvs/x86_64/apple/macos/darwin/16.5.0/include \ >> -v \ >> -nostdinc \ >> -fPIC \ >> -c \ >> -Wno-nullability-completeness \ >> hello.c x.c >> >> $ file hello.o >> hello.o: Mach-O 64-bit object x86_64 >> >> $ /usr/local/Cellar/llvm/4.0.0_1/bin/ld.lld \ >> -flavor darwin \ >> -v \ >> -sdk_version 10.5.0 \ >> -demangle \ >> -arch x86_64 \ >> -undefined dynamic_lookup \ >> -dylib \ >> -dynamic \ >> -o libhello.dylib \ >> hello.o >> >> $ file libhello.dylib >> libhello.dylib: Mach-O 64-bit dynamically linked shared library x86_64 >> >> $ gcc x.c -L. -lhello >> ld: malformed dylib has MH_NO_REEXPORTED_DYLIBS flag but no >> LC_REEXPORT_DYLIB load commands: ./libhello.dylib file ‘./libhello.dylib' >> >> >> >> >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev at lists.llvm.org >> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >> >> >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170506/60c9c4b8/attachment.html>