On Sat, 2012-09-29 at 10:54 +0800, Zhenzhong Duan wrote: > On 2012-09-28 22:54, Paul Bolle wrote: > > Not even before applying your patch? Anyhow, after applying your patch > > the warnings gone here too. > I tested both cases, no warning, also didn't see -Wmaybe-uninitialized > when make. > My env is el5. gcc version 4.1.2 20080704 (Red Hat 4.1.2-52) > Maybe your gcc built in/implicit spec use that option? I simply use what (was and) is shipped by Fedora 17: $ sudo grep -w gcc /var/log/yum.log Sep 12 11:45:54 Installed: gcc-4.7.0-5.fc17.x86_64 Sep 27 13:54:24 Updated: gcc-4.7.2-2.fc17.x86_64 So I did my patch with a version of GCC's release 4.7.0, and tested your patch with a version of GCC's 4.7.2 release. I don't think I tweaked any settings. Unless there are strong reasons to do otherwise, I try to use the tools shipped by Fedora in their default settings. (I'm not even sure there's a way to set one's GCC settings locally.) Paul Bolle -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>