[all-commits] [llvm/llvm-project] 911cee: Fix for OpenMP offloading compilation error with G...

[CHANDRA GHALE via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 911cee2fd086524517588a7bc8cffb88091612b4
      https://github.com/llvm/llvm-project/commit/911cee2fd086524517588a7bc8cffb88091612b4
  Author: CHANDRA GHALE <chandra.nitdgp at gmail.com>
  Date:   2024-11-11 (Mon, 11 Nov 2024)

  Changed paths:
    M clang/lib/Headers/openmp_wrappers/complex_cmath.h

  Log Message:
  -----------
  Fix for OpenMP offloading compilation error with GNU++20 option when using complex header (#115306)

The change done is to fix this issue.
[[Issue](https://github.com/llvm/llvm-project/issues/113207)] discussion
available in link provided.

When using the -std=c++20 flag with -fopenmp for OpenMP offloading
results in the following compilation error.

Reduced test Case :
```
> cat foo.cpp
#include <complex>

void foo(){
}
> CC -fopenmp -std=gnu++20 -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx90a foo.cpp -c
In file included from foo.cpp:1:
In file included from /opt/cray/pe/cce/18.0.1/cce-clang/x86_64/lib/clang/18/include/openmp_wrappers/complex:51:
/opt/cray/pe/cce/18.0.1/cce-clang/x86_64/lib/clang/18/include/openmp_wrappers/complex_cmath.h:68:40: error: non-constexpr declaration of 'conj' follows constexpr declaration
   68 | template <class _Tp> std::complex<_Tp> conj(const std::complex<_Tp> &__c) {
      |                                        ^
/usr/lib64/gcc/x86_64-suse-linux/13/../../../../include/c++/13/complex:970:5: note: previous declaration is here
  970 |     conj(const complex<_Tp>& __z)
      |     ^
1 error generated.
```

Co-authored-by: Chandra Ghale <ghale at pe31.hpc.amslabs.hpecorp.net>



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