[Bug lto/45375] [meta-bug] Issues with building Mozilla with LTO

["markus at trippelsdorf dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375

--- Comment #167 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2013-01-09 19:58:33 UTC ---
(In reply to comment #166)
> Markus, the apperance of undefined references I fixed by patch above is highly
> sensitive to partitioning and inlining decision.  Can you, please, check if the
> problem with PGO remains?  It may be another instance of the same issue.

Just checked it using your patch from comment 165, but the issue from
comment 162 is still there:

/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: /tmp/ccACx905.ltrans6.ltrans.o: requires dynamic R_X86_64_PC32 reloc
against '_ZN13nsXULDocument14MaybeBroadcastEv.466048' which may overflow at
runtime; recompile with -fPIC
/tmp/ccACx905.ltrans6.ltrans.o:ccACx905.ltrans6.o:function
nsRunnableMethodTraits<void (nsXULDocument::*)(), true>::base_type* NS_N
ewRunnableMethod<nsXULDocument*, void (nsXULDocument::*)()>(nsXULDocument*,
void (nsXULDocument::*)()) [clone .local.42120] [clone .constprop.89117]:
error: undefined reference to 'nsXULDocument::MaybeBroadcast() [clone .466048]'
/tmp/ccACx905.ltrans6.ltrans.o:ccACx905.ltrans6.o:function
nsRunnableMethodTraits<void (nsXULDocument::*)(), true>::base_type* NS_N
ewRunnableMethod<nsXULDocument*, void (nsXULDocument::*)()>(nsXULDocument*,
void (nsXULDocument::*)()) [clone .local.42120] [clone 
.constprop.89117]: error: undefined reference to
'nsXULDocument::MaybeBroadcast() [clone .466048]'

Also the memory usage went through the roof (not sure if this caused
by your patch or my recent git-pull of mozilla-central): 
over 9GB RAM is needed (not much fun on my 8GB test-machine).

(So I will stop testing Firfox for now, until LTO/PGO memory usage
gets sane again (hopefully for 4.9).)