Subject: Re: [PATCH RESEND 1/1] perf build: Allow nested externs to enable BUILD_BUG() usage

From: Jiri Olsa <[email-masked]>
Date: Fri, 9 Oct 2020 14:41:11 +0200

On Fri, Oct 09, 2020 at 02:25:23PM +0200, Vasily Gorbik wrote:
> 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 <[email-masked]>
> Signed-off-by: Vasily Gorbik <[email-masked]>

that one applied nicely ;-) thanks

Acked-by: Jiri Olsa <[email-masked]>

jirka

> ---
>  Resend with no fancy signatures.
> 
>  tools/perf/Makefile.config | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 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
>  
> -- 
> 2.25.4
>