From: Vasily Gorbik <gor@linux.ibm.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Next Mailing List <linux-next@vger.kernel.org>
Subject: [PATCH 1/1] perf build: Allow nested externs to enable BUILD_BUG() usage
Date: Fri, 9 Oct 2020 08:47:45 +0200 [thread overview]
Message-ID: <patch-1.thread-d92c35.git-d92c35ca4748.your-ad-here.call-01602224864-ext-8734@work.hours> (raw)
In-Reply-To: <cover.thread-d92c35.your-ad-here.call-01602224864-ext-8734@work.hours>
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>
---
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 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
--
⣿⣿⣿⣿⢋⡀⣀⠹⣿⣿⣿⣿
⣿⣿⣿⣿⠠⣶⡦⠀⣿⣿⣿⣿
⣿⣿⣿⠏⣴⣮⣴⣧⠈⢿⣿⣿
⣿⣿⡏⢰⣿⠖⣠⣿⡆⠈⣿⣿
⣿⢛⣵⣄⠙⣶⣶⡟⣅⣠⠹⣿
⣿⣜⣛⠻⢎⣉⣉⣀⠿⣫⣵⣿
next prev parent reply other threads:[~2020-10-09 6:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 4:28 linux-next: build failure after merge of the tip tree Stephen Rothwell
2020-10-09 6:47 ` Vasily Gorbik
2020-10-09 6:47 ` Vasily Gorbik [this message]
2020-10-09 11:23 ` [PATCH 1/1] perf build: Allow nested externs to enable BUILD_BUG() usage Jiri Olsa
2020-10-09 12:25 ` Vasily Gorbik
2020-10-09 12:25 ` [PATCH RESEND " Vasily Gorbik
2020-10-09 12:41 ` Jiri Olsa
2020-10-11 21:59 ` Stephen Rothwell
2020-10-12 5:13 ` Stephen Rothwell
2020-10-13 19:09 ` Arnaldo Carvalho de Melo
2020-10-13 19:07 ` Arnaldo Carvalho de Melo
2020-10-12 7:06 ` Sedat Dilek
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