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powerpc: Disable -Wbuiltin-requires-header when setjmp is used

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commit aea447141c upstream.

The powerpc kernel uses setjmp which causes a warning when building
with clang:

  In file included from arch/powerpc/xmon/xmon.c:51:
  ./arch/powerpc/include/asm/setjmp.h:15:13: error: declaration of
  built-in function 'setjmp' requires inclusion of the header <setjmp.h>
        [-Werror,-Wbuiltin-requires-header]
  extern long setjmp(long *);
              ^
  ./arch/powerpc/include/asm/setjmp.h:16:13: error: declaration of
  built-in function 'longjmp' requires inclusion of the header <setjmp.h>
        [-Werror,-Wbuiltin-requires-header]
  extern void longjmp(long *, long);
              ^

This *is* the header and we're not using the built-in setjump but
rather the one in arch/powerpc/kernel/misc.S. As the compiler warning
does not make sense, it for the files where setjmp is used.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
[mpe: Move subdir-ccflags in xmon/Makefile to not clobber -Werror]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joel Stanley
2018-09-17 17:16:21 +09:30
committed by Greg Kroah-Hartman
parent f716d5e5fa
commit 4df445a775
2 changed files with 7 additions and 1 deletions
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3
arch/powerpc/kernel/Makefile
View File

@@ -5,6 +5,9 @@
CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
# Disable clang warning for using setjmp without setjmp.h header
CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header)
subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
ifeq ($(CONFIG_PPC64),y)

5
arch/powerpc/xmon/Makefile
View File

@@ -1,7 +1,10 @@
# SPDX-License-Identifier: GPL-2.0
# Makefile for xmon
subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
# Disable clang warning for using setjmp without setjmp.h header
subdir-ccflags-y := $(call cc-disable-warning, builtin-requires-header)
subdir-ccflags-$(CONFIG_PPC_WERROR) += -Werror
GCOV_PROFILE := n
UBSAN_SANITIZE := n