llvm dev - Jul 2016 - Not able to use PGO with LLVM+Clang built from source

Hello,

When I try to use -fprofile-instr-generate with clang (which is built from
source) I am getting following error :

ld: file not found:
/Users/Mr.Pandya/My_Stuff/Active/llvm/build/bin/../lib/clang/3.9.0/lib/darwin/libclang_rt.profile_osx.a
clang-3.9: error: linker command failed with exit code 1 (use -v to see
invocation)

I am not building compiler RT with LLVM.

Am I missing any thing while building llvm/clang ?

Sincerely,
Vivek
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Yes, you are missing compiler-rt.  If you don't build compiler-rt, you will
not be able to use PGO.

On Tue, Jul 12, 2016 at 5:40 AM vivek pandya via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Hello,
>
> When I try to use -fprofile-instr-generate with clang (which is built from
> source) I am getting following error :
>
> ld: file not found:
>
/Users/Mr.Pandya/My_Stuff/Active/llvm/build/bin/../lib/clang/3.9.0/lib/darwin/libclang_rt.profile_osx.a
> clang-3.9: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> I am not building compiler RT with LLVM.
>
> Am I missing any thing while building llvm/clang ?
>
> Sincerely,
> Vivek
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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Vivek, in case you haven't seen it, we do have full support for multi-stage
PGO builds in CMake. The documentation is here:

http://llvm.org/docs/AdvancedBuilds.html#multi-stage-pgo

Your checkout will need to include LLVM, Clang, and Compiler-RT, and it will
generate targets to run the full PGO generation. I find that using this is way
easier than doing it manually.

-Chris
> On Jul 12, 2016, at 4:40 AM, vivek pandya via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hello,
> 
> When I try to use -fprofile-instr-generate with clang (which is built from
source) I am getting following error :
> 
> ld: file not found:
/Users/Mr.Pandya/My_Stuff/Active/llvm/build/bin/../lib/clang/3.9.0/lib/darwin/libclang_rt.profile_osx.a
> clang-3.9: error: linker command failed with exit code 1 (use -v to see
invocation)
> 
> I am not building compiler RT with LLVM.
> 
> Am I missing any thing while building llvm/clang ?
> 
> Sincerely,
> Vivek
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
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On Tue, Jul 12, 2016 at 9:07 PM, Chris Bieneman <cbieneman at apple.com>
wrote:
> Vivek, in case you haven't seen it, we do have full support for
> multi-stage PGO builds in CMake. The documentation is here:
>
> http://llvm.org/docs/AdvancedBuilds.html#multi-stage-pgo
>
> Your checkout will need to include LLVM, Clang, and Compiler-RT, and it
> will generate targets to run the full PGO generation. I find that using
> this is way easier than doing it manually.
>
> Thanks Chris for pointing this but after reading this it seems to optimize
llvm/clang it self , how ever I need to use profile information in a
Machine Function pass to help interprocedural register allocation and then
use it to optimize other softwares. I have not look into PGO.cmake.

-Vivek

-Chris
>
> On Jul 12, 2016, at 4:40 AM, vivek pandya via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
> Hello,
>
> When I try to use -fprofile-instr-generate with clang (which is built from
> source) I am getting following error :
>
> ld: file not found:
>
/Users/Mr.Pandya/My_Stuff/Active/llvm/build/bin/../lib/clang/3.9.0/lib/darwin/libclang_rt.profile_osx.a
> clang-3.9: error: linker command failed with exit code 1 (use -v to see
> invocation)
>
> I am not building compiler RT with LLVM.
>
> Am I missing any thing while building llvm/clang ?
>
> Sincerely,
> Vivek
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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