[PATCH] add attribute nonstring

[Martin Sebor]

On 11/27/2017 04:05 AM, Siddhesh Poyarekar wrote:
> On Friday 10 November 2017 11:01 PM, Martin Sebor wrote:
>> diff --git a/sysdeps/gnu/bits/utmp.h b/sysdeps/gnu/bits/utmp.h
>> index 2ee11cb..d4885f3 100644
>> --- a/sysdeps/gnu/bits/utmp.h
>> +++ b/sysdeps/gnu/bits/utmp.h
>> @@ -59,9 +59,13 @@ struct utmp
>>  {
>>    short int ut_type;		/* Type of login.  */
>>    pid_t ut_pid;			/* Process ID of login process.  */
>> +  __NONSTRING
>>    char ut_line[UT_LINESIZE];	/* Devicename.  */
>> +  __NONSTRING
>>    char ut_id[4];		/* Inittab ID.  */
>> +  __NONSTRING
>>    char ut_user[UT_NAMESIZE];	/* Username.  */
>> +  __NONSTRING
>>    char ut_host[UT_HOSTSIZE];	/* Hostname for remote login.  */
>>    struct exit_status ut_exit;	/* Exit status of a process marked
>>  				   as DEAD_PROCESS.  */
>
> This breaks builds with the latest gcc since your commit to warn on
> non-string arguments to strlen:

I didn't see any warnings in my x86_64-linux build but there could
be others on targets I don't test.  The only problem I do know of
(bug 22447) was fixed last Wednesday.

It would be helpful if you could share some details about the code
that triggers the warning, what target, etc.

Martin