From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Laura Abbott <labbott@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Wang Nan <wangnan0@huawei.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: New -Werror=restrict error with incremental gcc
Date: Thu, 15 Mar 2018 22:11:54 -0500 [thread overview]
Message-ID: <20180316031154.juk2uncs7baffctp@treble> (raw)
In-Reply-To: <53714ddf-1b2d-295b-e364-3330f1d9c48c@redhat.com>
On Thu, Mar 15, 2018 at 08:06:26AM -0700, Laura Abbott wrote:
> This only showed up with the very latest rawhide snapshot, .17 worked and
> .18 started failing. I had to download .18 manually to test locally
> https://koji.fedoraproject.org/koji/packageinfo?packageID=40
I also see the error with the latest gcc master branch. The code is
harmless, but maybe the warning is useful in other places, so here's one
way to fix it.
----
From: Josh Poimboeuf <jpoimboe@redhat.com>
Subject: [PATCH] objtool, perf: Fix GCC 8 -Wrestrict error
Starting with recent GCC 8 builds, objtool and perf fail to build with
the following error:
../str_error_r.c: In function ‘str_error_r’:
../str_error_r.c:25:3: error: passing argument 1 to restrict-qualified parameter aliases with argument 5 [-Werror=restrict]
snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
The code seems harmless, but there's probably no benefit in printing the
'buf' pointer in this situation anyway, so just remove it to make GCC
happy.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
tools/lib/str_error_r.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/str_error_r.c b/tools/lib/str_error_r.c
index d6d65537b0d9..6aad8308a0ac 100644
--- a/tools/lib/str_error_r.c
+++ b/tools/lib/str_error_r.c
@@ -22,6 +22,6 @@ char *str_error_r(int errnum, char *buf, size_t buflen)
{
int err = strerror_r(errnum, buf, buflen);
if (err)
- snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d", errnum, buf, buflen, err);
+ snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err);
return buf;
}
--
2.14.3
next prev parent reply other threads:[~2018-03-16 3:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-14 21:19 New -Werror=restrict error with incremental gcc Laura Abbott
2018-03-15 12:50 ` Jiri Olsa
2018-03-15 14:30 ` Arnaldo Carvalho de Melo
2018-03-15 15:06 ` Laura Abbott
2018-03-16 3:11 ` Josh Poimboeuf [this message]
2018-03-17 0:56 ` Laura Abbott
2018-03-20 6:36 ` [tip:perf/core] objtool, perf: Fix GCC 8 -Wrestrict error tip-bot for Josh Poimboeuf
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