[Bug regression/50999] [4.7 Regression]: g++.dg/lto/20081109 execute -O2 -flto -flto-partition=1to1 -fno-use-linker-plugin

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50999

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-11-07 12:02:36 UTC ---
Created attachment 25734
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25734
proposed patch

Hm, on x86_64 the EH table is not empty (look at g++.dg/lto/20081109_1.C,
the usual symtom is that the LTOed unit for that file does not contain
info to unwind from the throw - can you confirm that?).  The key is that
lto_init_eh() has to be called for that unit - previously we saved
flag_exceptions but now we only save explicit -fexceptions (thus, you
can verify if explicitly adding that option to the compile command line
fixes the issue).

Does the attached patch help?  It tries to start to address the (yet unsolved)
issue of preserving lang-dependent options.