Bug 462774 – x11-apps/xkbcomp broken with GCC 4.8 (cannot compile xkb map)

• Status: RESOLVED WONTFIX
• Product: Gentoo Linux

[Description Mike Lothian 2013-03-23 12:05:12 UTC]

GCC complains that the XKB map cannot be compiled and fails to start

This is a regression against GCC 4.7.2

Both are compiled with -O3 -march=native -flto

I'm unsure if this should be filed upstream with GCC or bugs.freedesktop.org

Reproducible: Always

Steps to Reproduce:
1. Compile xkbcomp with gcc 4.8
2. Restart X
3. Watch it not start :-(
Actual Results:  
X doesn't start

Expected Results:  
X should start

[Comment 1 Mike Lothian 2013-03-23 12:06:12 UTC]

Created attachment 342978 [details]
Xorg log

[Comment 2 Ryan Hill (RETIRED) 2013-03-23 18:34:12 UTC]

> Both are compiled with -O3 -march=native -flto

As the giant warning says when you build gcc, LTO is not supported.  Don't use it unless you're able to fix the problems you encounter.  Also, if you're using gcc snapshots you would have had to set I_PROMISE_TO_SUPPLY_PATCHES_WITH_BUGS in make.conf.

[Comment 3 Ryan Hill (RETIRED) 2013-03-24 06:19:21 UTC]

This isn't an lto bug after all.  You confused me when you said gcc can't compile the xkb map.

[Comment 4 Ryan Hill (RETIRED) 2013-03-24 06:49:26 UTC]

Arg, yes it is an lto bug.  I forgot to rebuild without -flto after testing last time.  Sorry about the noise.