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 <sfr@canb.auug.org.au> Tested-by: Stephen Rothwell <sfr@canb.auug.org.au> # build tested Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/patch-1.thread-251403.git-2514037e9477.your-ad-here.call-01602244460-ext-7088@work.hours
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@ -16,7 +16,7 @@ $(shell printf "" > $(OUTPUT).config-detected)
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detected = $(shell echo "$(1)=y" >> $(OUTPUT).config-detected)
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detected_var = $(shell echo "$(1)=$($(1))" >> $(OUTPUT).config-detected)
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CFLAGS := $(EXTRA_CFLAGS) $(EXTRA_WARNINGS)
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CFLAGS := $(EXTRA_CFLAGS) $(filter-out -Wnested-externs,$(EXTRA_WARNINGS))
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include $(srctree)/tools/scripts/Makefile.arch
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