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c9029ef9c9
Commit aea447141c ("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+
Suggested-by: Segher Boessenkool <segher@kernel.crashing.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191119045712.39633-3-natechancellor@gmail.com
30 lines
773 B
Makefile
30 lines
773 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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# Makefile for xmon
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# Avoid clang warnings around longjmp/setjmp declarations
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subdir-ccflags-y := -ffreestanding
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GCOV_PROFILE := n
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KCOV_INSTRUMENT := n
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UBSAN_SANITIZE := n
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KASAN_SANITIZE := n
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# Disable ftrace for the entire directory
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
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ifdef CONFIG_CC_IS_CLANG
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# clang stores addresses on the stack causing the frame size to blow
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# out. See https://github.com/ClangBuiltLinux/linux/issues/252
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KBUILD_CFLAGS += -Wframe-larger-than=4096
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endif
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ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC)
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obj-y += xmon.o nonstdio.o spr_access.o
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ifdef CONFIG_XMON_DISASSEMBLY
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obj-y += ppc-dis.o ppc-opc.o
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obj-$(CONFIG_SPU_BASE) += spu-dis.o spu-opc.o
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endif
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