Bug 366579

Summary:	sys-kernel/*-sources: Silence gcc-4.6.0 -Wunused-but-set-variable warning
Product:	Gentoo Linux	Reporter:	Stratos Psomadakis (RETIRED) <psomas>
Component:	[OLD] Core system	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED FIXED
Severity:	enhancement	CC:	hwoarang, nelchael, wired, xbox, xen
Priority:	Normal	Keywords:	InVCS
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	http://git.kernel.org/?p=linux/kernel/git/mmarek/kbuild-2.6.git;a=commit;h=af0e5d565d2fffcd97d1e2d89669d627cc04e8b8
Whiteboard:	gentoo-sources-2.6.37-r6
Package list:		Runtime testing required:	---
Attachments:	silence -Wunused-but-set-variable GCC warnings silence -Wunused-but-set-variable GCC warnings silence -Wunused-but-set-variable GCC warnings for 2.6.39

Description Stratos Psomadakis (RETIRED) gentoo-dev

2011-05-09 11:19:18 UTC

Created attachment 272601 [details, diff]
silence -Wunused-but-set-variable GCC warnings

GCC-4.6.0 has enabled -Wunused-but-set-variable warning by default, which can lead to very 'noisy' output when compiling Linux sources, and it can lead to compilation failure if -Werror flag is enabled (default for serveral archs). (bug 363935)

I'm not sure if this bug should block GCC 4.6 Porting (bug 346809).

This patch will probably be merged in 2.6.40, and maybe GCC-4.6.0 will still be masked, but if anyone wants to test it, they may have problems when compiling the kernel.

Btw, @QA: 
-Werror is enabled by default (and in many places without a CONFIG option to disable it) for compiling quite a lot of kernel code. Should I file a relevant bug to be tracked by bug 260867 ?.

Thanks.

Comment 1 Markos Chandras (RETIRED) gentoo-dev

2011-05-09 23:17:05 UTC

I don't think this is related to either QA or gcc-porting teams. I am CCing all the kernel sources maintainers. They may be interested in this patch.

Comment 2 Peter Volkov (RETIRED) gentoo-dev

2011-05-15 11:28:13 UTC

As for openvz sources they are based on 2.6.32 kernel so I guess general suggestion will be not to use newer gcc-4.6 (like for 2.6.18 kernels only gcc-4.1 is supported). So currently I'm include to keep things as they are.

Comment 3 Stratos Psomadakis (RETIRED) gentoo-dev

2011-05-18 18:10:32 UTC

Created attachment 273859 [details, diff]
silence -Wunused-but-set-variable GCC warnings

Comment 4 Stratos Psomadakis (RETIRED) gentoo-dev

2011-05-18 18:11:45 UTC

Created attachment 273861 [details, diff]
silence -Wunused-but-set-variable GCC warnings for 2.6.39

This one applies to 2.6.39 kernels, while the previous one applies to all the kernels currently in portage(2.6.32 - 2.6.38).

Comment 5 Mike Pagano gentoo-dev

2011-05-19 11:25:38 UTC

This will be in gentoo-sources-2.6.39 very soon(tm) and I will bring it to future releases of gentoo-sources .38 and .37 and .32

Thanks, Stratos!

Comment 6 Mike Pagano gentoo-dev

2011-05-24 17:53:58 UTC

Can be closed when gentoo-sources-2.6.37-r6 is released

Comment 7 Mike Pagano gentoo-dev

2011-05-26 16:30:44 UTC

Release in gentoo-sources-2.6.37-r6