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authorNathan Chancellor <natechancellor@gmail.com>2019-11-18 21:57:11 -0700
committerMichael Ellerman <mpe@ellerman.id.au>2019-11-25 21:45:43 +1100
commitc9029ef9c95765e7b63c4d9aa780674447db1ec0 (patch)
tree2d9162228948fbcb7f3bb22c3bae8ccbad1fd5a0 /arch/powerpc/kexec/Makefile
parent465bfd9c44dea6b55962b5788a23ac87a467c923 (diff)
powerpc: Avoid clang warnings around setjmp and longjmp
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+ 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
Diffstat (limited to 'arch/powerpc/kexec/Makefile')
-rw-r--r--arch/powerpc/kexec/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 16c1c5a19519..378f6108a414 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -3,8 +3,8 @@
# Makefile for the linux kernel.
#
-# Disable clang warning for using setjmp without setjmp.h header
-CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header)
+# Avoid clang warnings around longjmp/setjmp declarations
+CFLAGS_crash.o += -ffreestanding
obj-y += core.o crash.o core_$(BITS).o