From: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
To: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Shuah Khan <shuah@kernel.org>,
linux-kernel@vger.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: [PATCH] tools: Fix str_error_r() Werror=restrict build
Date: Mon, 19 Mar 2018 14:55:04 +0900 [thread overview]
Message-ID: <20180319055504.757-1-sergey.senozhatsky@gmail.com> (raw)
Commit c8b5f2c96d1bf6c ("tools: Introduce str_error_r()") added
an str_error_r() wrapper which makes gcc8 unhappy due to
restrict-qualified parameter aliasing violation:
../lib/str_error_r.c: In function ‘str_error_r’:
../lib/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);
^~~~~~~~
cc1: all warnings being treated as errors
Workaround that aliasing error by creating an additional stack
variable which holds the buf pointer value we passed to strerror_r().
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
---
tools/lib/str_error_r.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/tools/lib/str_error_r.c b/tools/lib/str_error_r.c
index d6d65537b0d9..11c3425f272b 100644
--- a/tools/lib/str_error_r.c
+++ b/tools/lib/str_error_r.c
@@ -21,7 +21,12 @@
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);
+ if (err) {
+ char *err_buf = buf;
+
+ snprintf(err_buf, buflen,
+ "INTERNAL ERROR: strerror_r(%d, %p, %zd)=%d",
+ errnum, buf, buflen, err);
+ }
return buf;
}
--
2.16.2
next reply other threads:[~2018-03-19 5:55 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-19 5:55 Sergey Senozhatsky [this message]
2018-03-19 7:18 ` [PATCH] tools: Fix str_error_r() Werror=restrict build Jiri Olsa
2018-03-19 7:44 ` Sergey Senozhatsky
2018-03-19 14:16 ` Arnaldo Carvalho de Melo
2018-03-19 14:23 ` Sergey Senozhatsky
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