[llvm-dev] Regd LLvm bolt with clang

[Anton Korobeynikov via llvm-dev]

Looks like a problem with linker (gold) from binutils. You may want to
update it, binutils 2.27 release was more than 3 years ago.

On Wed, Aug 21, 2019 at 8:23 AM Bose, Priyanka via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> Hi,
>
>
>
> We wanted to experiment as to how we can use the BOLT optimization from LLVM on our Android Platforms.
>
> We referred to the wiki from Facebook that speaks of Bolt
>
> https://github.com/facebookincubator/BOLT
>
>
>
> So I was using now the linker flag : "Wl,--emit-relocs"  in the instrumented mode to compile android module , for instance here “libc”.
>
> But the build fails with the llvm clang toolchain on android :
>
> ============================
>
> FAILED: out/soong/.intermediates/bionic/libc/libc/android_x86_core_shared/libc.so prebuilts/clang/host/linux-x86/clang-4691093/bin/clang++
>
> .....
>
> .....
>
> -Wl,--no-undefined -Wl,--hash-style=gnu -Wl,--emit-relocs -Wl,--hash-style=both -m32 -Wl,--version-script,bionic/libc/libc.x86.map
>
> prebuilts/gcc/linux-x86/x86/x86_64-linux-android-4.9/x86_64-linux-android/bin/ld: internal error in do_layout, at /buildbot/src/android/gcc/toolchain/build/../binutils/binutils-2.27/gold/object.cc:1821
>
> clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)
>
> ==============================
>
>
>
> I am using android clang prebuilts : "clang-4691093". Does the clang based llvm compiler need any special changes to use this compiler relocation compiler flag?
>
>
>
> Best Regards
>
> Priyanka
>
>
>
>
>
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-- 
With best regards, Anton Korobeynikov
Department of Statistical Modelling, Saint Petersburg State University