This was fixed correctly in gcc-4.8 (in utopic), but not in gcc-4.9:
$ cat format-extra-args.c
#include <stdio.h>
/* printf extra arguments example */
int main(void)
{
printf("%s\n", "argument 1", "argument 2");
return 0;
}
$ gcc-4.9 --version
gcc-4.9 (Ubuntu 4.9.0-4ubuntu4) 4.9.0
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc-4.9 -O2 -o format-off format-extra-args.c -Wno-format
format-extra-args.c: In function ‘main’:
format-extra-args.c:12:2: warning: too many arguments for format
[-Wformat-extra-args]
printf("%s\n", "argument 1", "argument 2");
^
With the fixed version in gcc-4.8, the output should look like so
$ gcc-4.8 --version
gcc-4.8 (Ubuntu 4.8.2-23ubuntu1) 4.8.2
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ gcc-4.8 -O2 -o format-off format-extra-args.c -Wno-format
$
gcc-4.9 still needs the attached patch applied.
** Patch added: "gcc-default-fix-format.diff"
https://bugs.launchpad.net/ubuntu/+source/gcc-4.9/+bug/1317305/+attachment/4117744/+files/gcc-default-fix-format.diff
** Changed in: gcc-4.9 (Ubuntu)
Status: Fix Released => Confirmed
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https://bugs.launchpad.net/bugs/1317305
Title:
-Wno-format is not honored
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