If you think you may have found a bug in GCC, please read the Bugs section of the GCC manual for advice on (1) how to tell when to report a bug, (2) where to send your bug report, and (3) how to write a useful bug report and what information it needs to have. There are three ways to read the Bugs section. (1) In a printed copy of the GCC manual. You can order one from the Free Software Foundation; see the file ORDERS. But if you don't have a copy on hand and you think you have found a bug, you shouldn't wait to get a printed manual; you should read the section right away as described below. (2) With Info. Start Emacs, do C-h i to enter Info, then m gcc RET to get to the GCC manual, then m Bugs RET to get to the section on bugs. Or use standalone Info in a like manner. (Standalone Info is part of the Texinfo distribution.) (3) By hand. Search for the chapter "Reporting Bugs" in gcc.texi, or cat /usr/local/info/gcc* | more "+/^File: gcc.info, Node: Bugs," You may also want to take a look at the GCC FAQ, in which there are additional instructions for submitting bug reports: http://www.gnu.org/software/gcc/faq.html#bugreport