[Bug other/49533] Firefox profiled build issues

[markus at trippelsdorf dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49533

--- Comment #2 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2011-06-27 10:25:13 UTC ---
(In reply to comment #1)
> The patch you quote has the effect of disabling pure const discovery for
> functions calling functions with an aliases defined.  It is quite surprising
> that this does make a difference, but I still think this is most likely effect
> of PR47247.
> 
> The COMDAT problem causes inline functions with address taken to not be
> optimized when their address is taken and indirect call profiling takes address
> of all virtuals.
> 
> Carry made an gold update that will hopefully hit the CVS binutils soonish and
> I will update then the GCC side.  Until that happens, I would advice using
> -fprofile-generate -fno-lto (i.e. LTO is not needed for the instrumented
> compiler).

Note that this happens with "-fprofile-generate" only (no lto involved).

Sprinkling "__attribute__((used))" all over the Javascript code, or using
ld.bfd solves the first issue, too.