Re: [PATCH] tests/tcg: Suppress compiler false-positive warning on sha1.c

[Peter Maydell <peter.maydell@linaro.org>]

On Wed, 5 Mar 2025 at 14:56, Brian Cain <brian.cain@oss.qualcomm.com> wrote:
> I was going to volunteer to update the toolchain used for hexagon to
> address this.  But unfortunately this warning is still not supported in
> clang 21.
>
> https://github.com/llvm/llvm-project/issues/72455 sounds like it's not
> very likely to arrive any time soon.
>
>
> So "-Wno-unknown-warning-option" does indeed seem like a good workaround.

I think the main problem with clang is that it doesn't default to
"don't complain about unknown warning options", whereas gcc does:

e104462:noble:qemu$ gcc -Wno-bang -o /tmp/hello /tmp/hello.c
e104462:noble:qemu$ clang -Wno-bang -o /tmp/hello /tmp/hello.c
warning: unknown warning option '-Wno-bang' [-Wunknown-warning-option]
1 warning generated.

-- PMM