All of lore.kernel.org
 help / color / mirror / Atom feed
From: Vasily Gorbik <gor@linux.ibm.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.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 RESEND 1/1] perf build: Allow nested externs to enable BUILD_BUG() usage
Date: Fri, 9 Oct 2020 14:25:23 +0200	[thread overview]
Message-ID: <patch-1.thread-251403.git-2514037e9477.your-ad-here.call-01602244460-ext-7088@work.hours> (raw)
In-Reply-To: <cover.thread-251403.your-ad-here.call-01602244460-ext-7088@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>
---
 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

  reply	other threads:[~2020-10-09 12:25 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   ` [PATCH 1/1] perf build: Allow nested externs to enable BUILD_BUG() usage Vasily Gorbik
2020-10-09 11:23     ` Jiri Olsa
2020-10-09 12:25       ` Vasily Gorbik
2020-10-09 12:25         ` Vasily Gorbik [this message]
2020-10-09 12:41           ` [PATCH RESEND " 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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=patch-1.thread-251403.git-2514037e9477.your-ad-here.call-01602244460-ext-7088@work.hours \
    --to=gor@linux.ibm.com \
    --cc=acme@kernel.org \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=hpa@zytor.com \
    --cc=jolsa@redhat.com \
    --cc=jpoimboe@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-next@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mhiramat@kernel.org \
    --cc=mingo@redhat.com \
    --cc=namhyung@kernel.org \
    --cc=peterz@infradead.org \
    --cc=sfr@canb.auug.org.au \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.