flang-new: error: unknown argument: --gcc-toolchain, --rocm-path, -frtlib-add-rpath

[dpalermo]

There are a few driver flags missing from flang-new that are needed for selecting components from alternate paths:

flang-new: error: unknown argument: '--gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9'
flang-new: error: unknown argument: '--rocm-path=/opt/rocm'
flang-new: error: unknown argument: '-frtlib-add-rpath'

As clang accepts these, flang-new should as well.

The above can be reproduced with:

$ cat hello.f
        program hello
             print *, 'Hello World!'
        end program hello

$ flang-new  hello.f --gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9
flang-new: error: unknown argument: '--gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9'
$ flang-new  hello.f --rocm-path=/opt/rocm
flang-new: error: unknown argument: '--rocm-path=/opt/rocm'
$ flang-new  hello.f  -frtlib-add-rpath
flang-new: error: unknown argument: '-frtlib-add-rpath'

[llvmbot]

@llvm/issue-subscribers-flang-driver

Author: None (dpalermo)

There are a few driver flags missing from flang-new that are needed for selecting components from alternate paths:

flang-new: error: unknown argument: '--gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9'
flang-new: error: unknown argument: '--rocm-path=/opt/rocm'
flang-new: error: unknown argument: '-frtlib-add-rpath'

As clang accepts these, flang-new should as well.

The above can be reproduced with:

$ cat hello.f
        program hello
             print *, 'Hello World!'
        end program hello

$ flang-new  hello.f --gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9
flang-new: error: unknown argument: '--gcc-toolchain=/usr/lib/gcc/x86_64-linux-gnu/9'
$ flang-new  hello.f --rocm-path=/opt/rocm
flang-new: error: unknown argument: '--rocm-path=/opt/rocm'
$ flang-new  hello.f  -frtlib-add-rpath
flang-new: error: unknown argument: '-frtlib-add-rpath'

[ChunyuLiao]

There are a few similarities:
#82494

[dpalermo]

--gcc-toolchain (& --gcc-install-dir) now supported with #87360

[DominikAdamski]

PR for --rocm-path: #88190

[DominikAdamski]

PR for --frtlib-add-rpath: #88280