[llvm-dev] Linker Error when building test-suite with PGO

[Xinliang David Li via llvm-dev]

There might be a bug in the compiler exposed with instrumentation on.  The
reference to link_error0 is guarded by a conditional branch which evaluates
to be false -- but the compiler fails to simplify it away leading to linker
error.

David

On Thu, Mar 25, 2021 at 8:25 AM Liqiang Tao via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Dear All,
>
> When I build test-suite with following option,
> -DTEST_SUITE_PROFILE_GENERATE=ON
>
> I got some errors.
> [ 83%] Building C object
> SingleSource/Regression/C/gcc-c-torture/execute/ieee/CMakeFiles/GCC-C-execute-ieee-fp-cmp-8e.dir/fp-cmp-8e.c.o
> [ 83%] Building C object
> SingleSource/Regression/C/gcc-c-torture/execute/ieee/CMakeFiles/GCC-C-execute-ieee-fp-cmp-3.dir/fp-cmp-3.c.o
> CMakeFiles/GCC-C-execute-ieee-compare-fp-3.dir/compare-fp-3.c.o: In
> function `test2':
> compare-fp-3.c:(.text+0x4d): undefined reference to `link_error0'
> CMakeFiles/GCC-C-execute-ieee-compare-fp-3.dir/compare-fp-3.c.o: In
> function `test3':
> compare-fp-3.c:(.text+0x8d): undefined reference to `link_error0'
> CMakeFiles/GCC-C-execute-ieee-compare-fp-3.dir/compare-fp-3.c.o: In
> function `test5':
> compare-fp-3.c:(.text+0x113): undefined reference to `link_error1'
> CMakeFiles/GCC-C-execute-ieee-compare-fp-3.dir/compare-fp-3.c.o: In
> function `test6':
> compare-fp-3.c:(.text+0x163): undefined reference to `link_error1'
> CMakeFiles/GCC-C-execute-ieee-compare-fp-3.dir/compare-fp-3.c.o: In
> function `all_tests':
> compare-fp-3.c:(.text+0x1f0): undefined reference to `link_error0'
> compare-fp-3.c:(.text+0x223): undefined reference to `link_error0'
> compare-fp-3.c:(.text+0x2f6): undefined reference to `link_error1'
> compare-fp-3.c:(.text+0x344): undefined reference to `link_error1'
> [ 83%] Linking C executable GCC-C-execute-ieee-fp-cmp-1
> clang-12: error: linker command failed with exit code 1 (use -v to see
> invocation)
> [ 83%] Building C object
> SingleSource/Regression/C/gcc-c-torture/execute/ieee/CMakeFiles/GCC-C-execute-ieee-fp-cmp-8l.dir/fp-cmp-8l.c.o
>
> There errors won't appear if -DTEST_SUITE_PROFILE_GENERATE=OFF.
>
> I got no idea from these error messages. Please allow me to ask for help
> here.
> Has anyone met errors like these before? I appreciate for your help.
>
> Best Wishes,
> Liqiang Tao
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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