I am trying to build up emacs against GCC-5.0 under Fedora rawhide and 
Fedora 22 but it fails
with core-dump.

A snip from build log:
Loading /builddir/build/BUILD/emacs-24.4/lisp/uniquify.el (source)...
Loading /builddir/build/BUILD/emacs-24.4/lisp/electric.el (source)...
Loading /builddir/build/BUILD/emacs-24.4/lisp/tooltip.el (source)...
Finding pointers to doc strings...
Finding pointers to doc strings...done
Dumping under the name emacs
/bin/sh: line 7: 24274 Segmentation fault      (core dumped) ./temacs 
--batch --load loadup bootstrap
Makefile:815: recipe for target 'bootstrap-emacs' failed
make[2]: Leaving directory '/builddir/build/BUILD/emacs-24.4/build-gtk/src'
make[2]: *** [bootstrap-emacs] Error 1
Makefile:382: recipe for target 'src' failed
make[1]: Leaving directory '/builddir/build/BUILD/emacs-24.4/build-gtk'
Makefile:1093: recipe for target 'bootstrap' failed

Build log is the attachment.

Did you discovered this issue?

gcc (GCC) 5.0.0 20150319 (Red Hat 5.0.0-0.21)
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


-- 
Petr Hracek
Software Engineer
Developer Experience
Red Hat, Inc
Mob: +420777056169
email: phracek@redhat.com