Message ID | 20190911182049.77853-3-natechancellor@gmail.com (mailing list archive) |
---|---|
State | Superseded |
Headers | show |
Series | LLVM/Clang fixes for pseries_defconfig | expand |
Context | Check | Description |
---|---|---|
snowpatch_ozlabs/apply_patch | success | Successfully applied on branch next (c317052c95bef1f977b023158e5aa929215f443d) |
snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 20 lines checked |
On Wed, Sep 11, 2019 at 11:21 AM Nathan Chancellor <natechancellor@gmail.com> wrote: > > Commit aea447141c7e ("powerpc: Disable -Wbuiltin-requires-header when > setjmp is used") disabled -Wbuiltin-requires-header because of a warning > about the setjmp and longjmp declarations. > > r367387 in clang added another diagnostic around this, complaining that > there is no jmp_buf declaration. > > In file included from ../arch/powerpc/xmon/xmon.c:47: > ../arch/powerpc/include/asm/setjmp.h:10:13: error: declaration of > built-in function 'setjmp' requires the declaration of the 'jmp_buf' > type, commonly provided in the header <setjmp.h>. > [-Werror,-Wincomplete-setjmp-declaration] > extern long setjmp(long *); > ^ > ../arch/powerpc/include/asm/setjmp.h:11:13: error: declaration of > built-in function 'longjmp' requires the declaration of the 'jmp_buf' > type, commonly provided in the header <setjmp.h>. > [-Werror,-Wincomplete-setjmp-declaration] > extern void longjmp(long *, long); > ^ > 2 errors generated. > > We are not using the standard library's longjmp/setjmp implementations > for obvious reasons; make this clear to clang by using -ffreestanding > on these files. Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> https://godbolt.org/z/B2oQnl > > Cc: stable@vger.kernel.org # 4.14+ > Link: https://github.com/ClangBuiltLinux/linux/issues/625 > Link: https://github.com/llvm/llvm-project/commit/3be25e79477db2d31ac46493d97eca8c20592b07 > Suggested-by: Segher Boessenkool <segher@kernel.crashing.org> > Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> > --- > > v1 -> v3: > > * Use -ffreestanding instead of outright disabling the warning because > it is legitimate. > > I skipped v2 because the first patch in the series already had a v2. > > arch/powerpc/kernel/Makefile | 4 ++-- > arch/powerpc/xmon/Makefile | 4 ++-- > 2 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile > index c9cc4b689e60..19f19c8c874b 100644 > --- a/arch/powerpc/kernel/Makefile > +++ b/arch/powerpc/kernel/Makefile > @@ -5,8 +5,8 @@ > > CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' > > -# Disable clang warning for using setjmp without setjmp.h header > -CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header) > +# Avoid clang warnings around longjmp/setjmp declarations > +CFLAGS_crash.o += -ffreestanding > > ifdef CONFIG_PPC64 > CFLAGS_prom_init.o += $(NO_MINIMAL_TOC) > diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile > index f142570ad860..c3842dbeb1b7 100644 > --- a/arch/powerpc/xmon/Makefile > +++ b/arch/powerpc/xmon/Makefile > @@ -1,8 +1,8 @@ > # SPDX-License-Identifier: GPL-2.0 > # Makefile for xmon > > -# Disable clang warning for using setjmp without setjmp.h header > -subdir-ccflags-y := $(call cc-disable-warning, builtin-requires-header) > +# Avoid clang warnings around longjmp/setjmp declarations > +subdir-ccflags-y := -ffreestanding > > GCOV_PROFILE := n > KCOV_INSTRUMENT := n > -- > 2.23.0 >
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index c9cc4b689e60..19f19c8c874b 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -5,8 +5,8 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' -# Disable clang warning for using setjmp without setjmp.h header -CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header) +# Avoid clang warnings around longjmp/setjmp declarations +CFLAGS_crash.o += -ffreestanding ifdef CONFIG_PPC64 CFLAGS_prom_init.o += $(NO_MINIMAL_TOC) diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile index f142570ad860..c3842dbeb1b7 100644 --- a/arch/powerpc/xmon/Makefile +++ b/arch/powerpc/xmon/Makefile @@ -1,8 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for xmon -# Disable clang warning for using setjmp without setjmp.h header -subdir-ccflags-y := $(call cc-disable-warning, builtin-requires-header) +# Avoid clang warnings around longjmp/setjmp declarations +subdir-ccflags-y := -ffreestanding GCOV_PROFILE := n KCOV_INSTRUMENT := n
Commit aea447141c7e ("powerpc: Disable -Wbuiltin-requires-header when setjmp is used") disabled -Wbuiltin-requires-header because of a warning about the setjmp and longjmp declarations. r367387 in clang added another diagnostic around this, complaining that there is no jmp_buf declaration. In file included from ../arch/powerpc/xmon/xmon.c:47: ../arch/powerpc/include/asm/setjmp.h:10:13: error: declaration of built-in function 'setjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration] extern long setjmp(long *); ^ ../arch/powerpc/include/asm/setjmp.h:11:13: error: declaration of built-in function 'longjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header <setjmp.h>. [-Werror,-Wincomplete-setjmp-declaration] extern void longjmp(long *, long); ^ 2 errors generated. We are not using the standard library's longjmp/setjmp implementations for obvious reasons; make this clear to clang by using -ffreestanding on these files. Cc: stable@vger.kernel.org # 4.14+ Link: https://github.com/ClangBuiltLinux/linux/issues/625 Link: https://github.com/llvm/llvm-project/commit/3be25e79477db2d31ac46493d97eca8c20592b07 Suggested-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> --- v1 -> v3: * Use -ffreestanding instead of outright disabling the warning because it is legitimate. I skipped v2 because the first patch in the series already had a v2. arch/powerpc/kernel/Makefile | 4 ++-- arch/powerpc/xmon/Makefile | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)