http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45375
--- Comment #104 from Jan Hubicka <hubicka at ucw dot cz> 2011-06-18 08:53:37 UTC --- > Even with 8c1fce46fc0 reverted libxul fails to link during > a profiledbuild. Normal build is fine. I didn't really tested profiledbuild for a while, so I will check. Last time I tried we was able to build libxul but still had problems building one of later libraries because of the COMDAT issues. I filled Mozilla PR for that (the problem really is including some classes but not linking with their implementation). What worked well for me is to profile w/o LTO and LTO final build. This is recommended way anyway as LTO -fprofile-generae build is unnecesarily expensive. What is the official way of building mozilla with FDO? Does the non-FDO problem persist for you? The Jul 10 commit was part of longer series of alias rewrite and I fixed some of fallout afterwards (and was able to build mozilla). Didn't see the particular problem you report however. Honza
