[llvm-dev] ld.lld on MacOS question

[Rui Ueyama via llvm-dev]

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'
>
>
>
>
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>
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