* [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option
@ 2023-06-08 17:01 Nathan Chancellor
2023-06-08 17:21 ` Hamza Mahfooz
2023-06-10 7:14 ` Jani Nikula
0 siblings, 2 replies; 4+ messages in thread
From: Nathan Chancellor @ 2023-06-08 17:01 UTC (permalink / raw)
To: alexander.deucher, christian.koenig, Xinhui.Pan
Cc: ndesaulniers, trix, hamza.mahfooz, Kenny.Ho, amd-gfx, dri-devel,
llvm, patches, Nathan Chancellor
-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.
Closes: https://github.com/ClangBuiltLinux/linux/issues/1869
Fixes: a0fd5a5f676c ("drm/amd/amdgpu: introduce DRM_AMDGPU_WERROR")
Signed-off-by: Nathan Chancellor <nathan@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,
--
Nathan Chancellor <nathan@kernel.org>
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option
2023-06-08 17:01 [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option Nathan Chancellor
@ 2023-06-08 17:21 ` Hamza Mahfooz
2023-06-10 7:14 ` Jani Nikula
1 sibling, 0 replies; 4+ messages in thread
From: Hamza Mahfooz @ 2023-06-08 17:21 UTC (permalink / raw)
To: Nathan Chancellor, alexander.deucher, christian.koenig, Xinhui.Pan
Cc: ndesaulniers, trix, Kenny.Ho, amd-gfx, dri-devel, llvm, patches
On 6/8/23 13:01, Nathan Chancellor 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.
>
> Closes: https://github.com/ClangBuiltLinux/linux/issues/1869
> Fixes: a0fd5a5f676c ("drm/amd/amdgpu: introduce DRM_AMDGPU_WERROR")
> Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Applied, thanks!
> ---
> 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,
--
Hamza
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option
2023-06-08 17:01 [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option Nathan Chancellor
2023-06-08 17:21 ` Hamza Mahfooz
@ 2023-06-10 7:14 ` Jani Nikula
2023-06-12 15:39 ` Nathan Chancellor
1 sibling, 1 reply; 4+ messages in thread
From: Jani Nikula @ 2023-06-10 7:14 UTC (permalink / raw)
To: Nathan Chancellor, alexander.deucher, christian.koenig, Xinhui.Pan
Cc: amd-gfx, trix, llvm, ndesaulniers, patches, dri-devel,
Nathan Chancellor, hamza.mahfooz, Kenny.Ho
On Thu, 08 Jun 2023, Nathan Chancellor <nathan@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 <nathan@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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option
2023-06-10 7:14 ` Jani Nikula
@ 2023-06-12 15:39 ` Nathan Chancellor
0 siblings, 0 replies; 4+ messages in thread
From: Nathan Chancellor @ 2023-06-12 15:39 UTC (permalink / raw)
To: Jani Nikula
Cc: alexander.deucher, christian.koenig, Xinhui.Pan, amd-gfx, trix,
llvm, ndesaulniers, patches, dri-devel, hamza.mahfooz, Kenny.Ho
On Sat, Jun 10, 2023 at 10:14:05AM +0300, Jani Nikula wrote:
> On Thu, 08 Jun 2023, Nathan Chancellor <nathan@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.
I don't think there is anything other than the official documentations for each listing
all the warning options. I know each version has its own documentation
for comparing warnings between releases but that is obviously tedious.
The clang -Wall question is easy enough to answer based on the test
case:
https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0/clang/test/Misc/warning-wall.c
https://github.com/llvm/llvm-project/blob/llvmorg-15.0.0/clang/test/Misc/warning-wall.c
https://github.com/llvm/llvm-project/blob/llvmorg-14.0.0/clang/test/Misc/warning-wall.c
https://github.com/llvm/llvm-project/blob/llvmorg-13.0.0/clang/test/Misc/warning-wall.c
https://github.com/llvm/llvm-project/blob/llvmorg-12.0.0/clang/test/Misc/warning-wall.c
https://github.com/llvm/llvm-project/blob/llvmorg-11.0.0/clang/test/Misc/warning-wall.c
Clang has a tool, diagtool, that can print information about -Wextra,
but I do not ship it with the kernel.org LLVM releases, nor does Debian
it seems. On a recent clang-17 (the colors don't matter for this
exercise):
$ diagtool tree -Wextra
GREEN = enabled by default
YELLOW = disabled by default
RED = unimplemented (accepted for GCC compatibility)
-Wextra
-Wdeprecated-copy
-Wdeprecated-copy-with-user-provided-copy
-Wmissing-field-initializers
-Wignored-qualifiers
-Wignored-reference-qualifiers
-Winitializer-overrides
-Wsemicolon-before-method-body
-Wmissing-method-return-type
-Wsign-compare
-Wunused-parameter
-Wunused-but-set-parameter
-Wnull-pointer-arithmetic
-Wgnu-null-pointer-arithmetic
-Wnull-pointer-subtraction
-Wempty-init-stmt
-Wstring-concatenation
-Wfuse-ld-path
Maybe some of that can be useful for future travelers.
> If there isn't one, it would be really helpful. *wink*.
Heh, that does sound like an interesting project but I am not sure I
have the bandwidth at the moment to do something like that, especially
since the number of warnings that are different between GCC and clang
are continuing to dwindle :)
Cheers,
Nathan
> > Closes: https://github.com/ClangBuiltLinux/linux/issues/1869
> > Fixes: a0fd5a5f676c ("drm/amd/amdgpu: introduce DRM_AMDGPU_WERROR")
> > Signed-off-by: Nathan Chancellor <nathan@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
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-06-08 17:01 [PATCH] drm/amdgpu: Wrap -Wunused-but-set-variable in cc-option Nathan Chancellor
2023-06-08 17:21 ` Hamza Mahfooz
2023-06-10 7:14 ` Jani Nikula
2023-06-12 15:39 ` Nathan Chancellor
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