http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43341
--- Comment #6 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> 2011-04-26 20:18:42 UTC --- (In reply to comment #5) > (In reply to comment #4) > > gcc -fpack-struct=4 -fprofile-generate test.c > > -fpack-struct changes the ABI so it is not fully a bug there. It's a gray area. -fprofile-generate is not documented as relying on "structs", as far as I could tell, so it's not intuitively obvious that it should have any interaction with -fpack-struct= at all. IMHO -fprofile-generate should always produce working code. At the very least, the interaction should be documented in the documentation for -fprofile-generate. The same pitfalls also apply to -fprofile-arcs.
