From ab0a40ea88204e1291b56da8128e2845fec8ee88 Mon Sep 17 00:00:00 2001 From: Vasily Gorbik Date: Fri, 9 Oct 2020 14:25:23 +0200 Subject: perf build: Allow nested externs to enable BUILD_BUG() usage Currently the BUILD_BUG() macro is expanded to 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 would obviously 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 Tested-by: Stephen Rothwell # build tested Signed-off-by: Vasily Gorbik Signed-off-by: Ingo Molnar Link: https://lore.kernel.org/r/patch-1.thread-251403.git-2514037e9477.your-ad-here.call-01602244460-ext-7088@work.hours --- tools/perf/Makefile.config | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'tools') diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 190be4fa5c21..8137a6046a47 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 -- cgit v1.2.3