[LLVMdev] LTO support on Mac

[Rahman Lavaee]

Thank you Nick. I think it's worth giving LLD a try.
I tried building lld (branch 3.4) on top of llvm 3.4 and got the following
error in the last step when it is linking lld.

[100%] Building CXX object tools/lld/tools/lld/CMakeFiles/lld.dir/lld.cpp.o
Linking CXX executable ../../../../bin/lld
ld: library not found for -llldHexagonELFTarget

Can you please help me with that?

On Mon, Jan 12, 2015 at 5:55 PM, Nick Kledzik <kledzik at apple.com> wrote:

>
>
> On Jan 12, 2015, at 2:45 PM, Rafael Espíndola <rafael.espindola at gmail.com>
> wrote:
> > On 10 January 2015 at 17:43, Rahman Lavaee <r.lavaee at gmail.com> wrote:
> >> Hi,
> >> I'm building LLVM on Mac OS 10.10 and I'm having trouble making LTO
> work.
> >> The system linker dumps the following information when I executed "ld
> -v"
> >>
> >> @(#)PROGRAM:ld  PROJECT:ld64-241.9
> >> configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64
> x86_64h
> >> armv6m armv7m armv7em
> >> LTO support using: LLVM version 3.4.2
> >>
> >> which tells me that it is correctly pointing to the LLVM that I have
> built.
> >> However, when I pass any LTO command line arguments like
> "disable-inling" it
> >> complains.
> >>
> >> I was previously working on Linux and the gold plugin makes it very
> >> convenient. However, that plugin only handles ELF assembly and I can't
> >> install it on Mac.
> >
> >
> > I am not sure if there is a supported way of passing extra llvm
> > options during LTO with ld64.
>
> You can pass options with -mllvm.  But you need to get it to the linker,
> so when invoking the linker through clang it looks like:
>
>  -Wl,-llvm,-myltoopt
>
> That will get it to lto_codegen_debug_options().  But I don't know what
> options strings lto_codegen_debug_options() handles.
>
> -Nick




-- 
Rahman
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150118/070a60e3/attachment.html>