On Thu, 08 Jun 2023, Nathan Chancellor <nat...@kernel.org> wrote: > -Wunused-but-set-variable was only supported in clang starting with > 13.0.0, so earlier versions will emit a warning, which is turned into a > hard error for the kernel to mirror GCC: > > error: unknown warning option '-Wunused-but-set-variable'; did you mean > '-Wunused-const-variable'? [-Werror,-Wunknown-warning-option] > > The minimum supported version of clang for building the kernel is > 11.0.0, so match the rest of the kernel and wrap > -Wunused-but-set-variable in a cc-option call, so that it is only used > when supported by the compiler.
I wonder if there's a table somewhere listing all the warning options, which GCC and Clang versions support them, and which versions have them in -Wall and -Wextra. Would be really useful. If there isn't one, it would be really helpful. *wink*. BR, Jani. > > Closes: https://github.com/ClangBuiltLinux/linux/issues/1869 > Fixes: a0fd5a5f676c ("drm/amd/amdgpu: introduce DRM_AMDGPU_WERROR") > Signed-off-by: Nathan Chancellor <nat...@kernel.org> > --- > drivers/gpu/drm/amd/amdgpu/Makefile | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile > b/drivers/gpu/drm/amd/amdgpu/Makefile > index 7ee68b1bbfed..86b833085f19 100644 > --- a/drivers/gpu/drm/amd/amdgpu/Makefile > +++ b/drivers/gpu/drm/amd/amdgpu/Makefile > @@ -40,7 +40,7 @@ ccflags-y := -I$(FULL_AMD_PATH)/include/asic_reg \ > -I$(FULL_AMD_PATH)/amdkfd > > subdir-ccflags-y := -Wextra > -subdir-ccflags-y += -Wunused-but-set-variable > +subdir-ccflags-y += $(call cc-option, -Wunused-but-set-variable) > subdir-ccflags-y += -Wno-unused-parameter > subdir-ccflags-y += -Wno-type-limits > subdir-ccflags-y += -Wno-sign-compare > > --- > base-commit: 6bd4b01e8938779b0d959bdf33949a9aa258a363 > change-id: > 20230608-amdgpu-wrap-wunused-but-set-variable-in-cc-option-0be9528ac5c8 > > Best regards, -- Jani Nikula, Intel Open Source Graphics Center
