[Flang] OpenMP offload missing driver option

[ye-luo]

clang supports -Xopenmp-target= but flang-new doesn't

$ flang-new -c -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx906 -O3 dualspace.f90 
flang-new: error: unknown argument: '-Xopenmp-target=amdgcn-amd-amdhsa'
flang-new: error: cannot determine amdgcn architecture: /soft/compilers/llvm/main-20240305/bin/amdgpu-arch: ; consider passing it via '-march'

I knew that

flang-new -c -fopenmp --offload-arch=gfx906 -O3 dualspace.f90

works. Please support -Xopenmp-target for sending accurate options to the offload pass.

[llvmbot]

@llvm/issue-subscribers-flang-driver

Author: Ye Luo (ye-luo)

clang supports `-Xopenmp-target=` but flang-new doesn't ``` $ flang-new -c -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx906 -O3 dualspace.f90 flang-new: error: unknown argument: '-Xopenmp-target=amdgcn-amd-amdhsa' flang-new: error: cannot determine amdgcn architecture: /soft/compilers/llvm/main-20240305/bin/amdgpu-arch: ; consider passing it via '-march' ``` I knew that ``` flang-new -c -fopenmp --offload-arch=gfx906 -O3 dualspace.f90 ``` works. Please support `-Xopenmp-target` for sending accurate options to the offload pass.