fscanf problem in glibc shipped with latest F11 updates.

Maz The Northener mazziesaccount at gmail.com
Mon Aug 31 14:26:05 UTC 2009

Thanks for quick answer :) I was just puzzled because this seemed to
work without extra defines with older glibc.

On Mon, Aug 31, 2009 at 5:10 PM, Jakub Jelinek<jakub at redhat.com> wrote:
> On Mon, Aug 31, 2009 at 04:45:17PM +0300, Maz The Northener wrote:
>> I found out that after I updated my F11 a few days ago, fscanf started
>> missbehaving.
>> I filed a bug report in bugzilla. (bug 520414)
>> but since I have not heard anyone else yelling about this, I thought
>> that maybe this is my fault after all... Any suggestions how to verify
>> this?
>> (I do not need any help overcoming it, workaround is quite
>> straightforward for me - remove GNU extension usage. I just would like
>> to know if the bug is on my side.)
> This is just a user error.  You are not using any feature test macros
> (see
> info libc 'Feature Test Macros'
> ), and with that glibc headers when not using strict ISO C modes (-ansi,
> -std=c89, -std=c99) default to _POSIX_C_SOURCE=200809L in recent glibcs,
> which among other things mean XPG6 compliant *scanf.  As %a is a POSIX
> floating point in hex specifier, it conflicts with the GNU extension
> where a if followed by s, S or [ is treated as allocatable modifier.
> So, to make your code work either compile with -D_GNU_SOURCE, or, better,
> just use POSIX 2008 way, %m[a-z].
>        Jakub
> --
> fedora-devel-list mailing list
> fedora-devel-list at redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-devel-list


-Matti "Maz" Vaittinen
CWF coding team leader

When you feel blue, no one sees your tears... When your down, no one
understands your struggle...
When you feel happy, no one notices your smile...
But fart just once...
I would love to create a freeware game with C - unless I was working at NSN.

More information about the devel mailing list