port-sparc64/48501: GCC 4.5.3 gets stuck compiling "libvpx" package

[tron%zhadum.org.uk@localhost]

>Number:         48501
>Category:       port-sparc64
>Synopsis:       GCC 4.5.3 gets stuck compiling "libvpx" package
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-sparc64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jan 05 13:35:00 +0000 2014
>Originator:     tron%zhadum.org.uk@localhost
>Release:        NetBSD 6.1_STABLE 2013-01-4 sources
>Organization:
Matthias Scheler                                  http://zhadum.org.uk/
>Environment:
System: NetBSD sheridan.zhadum.org.uk 6.1_STABLE NetBSD 6.1_STABLE (SHERIDAN) 
#0: Sat Jan 4 19:17:47 GMT 2014 
tron%excalibur.zhadum.org.uk@localhost:/objdir/tron/nb/sys/arch/sparc64/compile/SHERIDAN
 sparc64
Architecture: sparc64
Machine: sparc64
>Description:
The "multimedia/libvpx" package in pkgsrc cannot be compiler under
NetBSD/sparc64 unless optimization is disabled. Otherwise the compile
will get stuck while building "vp9/vp9_cx_iface.c". I tried to disable
"-O3" first but it didn't help. Only disabling any kind of optimization
(the package used "-O2" *and*" "-O3") worked around the problem.

>How-To-Repeat:
cd pkgsrc/multimedia/libvpx
rm hacks.mk
make clean && make

>Fix:
Not known.