[Bug lto/54095] Unnecessary static variable renaming

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54095

--- Comment #3 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-07-26 14:48:36 UTC ---
Created attachment 27879
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27879
incomplete prototype patch

Something like this.  But I'll rather wait for the symtab reorg to reach
cgraph/varpool_node_set (and for the partitioning rewrite to go in).

The patch simply, at current lto_promote_cross_file_statics time (which
can still alter the sets), does the mangling of statics.  Which means it
works at WPA time and thus will not work with -flto-partition=none.  LTRANS
file generation is confused because of conflicting section names if we try
to postpone it to LTRANS phase.  For -flto-partition=none we need a "simpler"
hack elsewhere.