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| author | Vasily Gorbik <gor@linux.ibm.com> | 2020-10-09 15:25:23 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-10-13 22:07:24 +0300 |
| commit | 6cf4ecf5c51d735433b3348ad055187536b1b4b6 (patch) | |
| tree | f163569c6018f1132728b56dee1b4c007278489e | |
| parent | f3013f7ed465479e60c1ab1921a5718fc541cc3b (diff) | |
| download | linux-6cf4ecf5c51d735433b3348ad055187536b1b4b6.tar.xz | |
perf build: Allow nested externs to enable BUILD_BUG() usage
Currently BUILD_BUG() macro is expanded to smth like the following:
do {
extern void __compiletime_assert_0(void)
__attribute__((error("BUILD_BUG failed")));
if (!(!(1)))
__compiletime_assert_0();
} while (0);
If used in a function body this obviously would produce build errors
with -Wnested-externs and -Werror.
To enable BUILD_BUG() usage in tools/arch/x86/lib/insn.c which perf
includes in intel-pt-decoder, build perf without -Wnested-externs.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> # build tested
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/patch-1.thread-251403.git-2514037e9477.your-ad-here.call-01602244460-ext-7088@work.hours
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/Makefile.config | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 854da830b5ca..834061e94e7c 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -16,7 +16,7 @@ $(shell printf "" > $(OUTPUT).config-detected) detected = $(shell echo "$(1)=y" >> $(OUTPUT).config-detected) detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected) -CFLAGS := $(EXTRA_CFLAGS) $(EXTRA_WARNINGS) +CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS)) include $(srctree)/tools/scripts/Makefile.arch |