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[Bug tree-optimization/49618] When building uClibc with GCC 4.6.1 old_atexit is miscompiled
- From: "edwintorok at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sun, 3 Jul 2011 15:07:34 +0000
- Subject: [Bug tree-optimization/49618] When building uClibc with GCC 4.6.1 old_atexit is miscompiled
- Auto-submitted: auto-generated
- References: <bug-49618-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49618
--- Comment #2 from TÃrÃk Edwin <edwintorok at gmail dot com> 2011-07-03 15:07:02 UTC ---
(In reply to comment #1)
> Ouch. I can see where it might be NULLâ but in anal-C99 taking a pointer of
> an object (&__dso_handle) can never be a NULL pointer, so GCC might, in a
> very theoretical sense, be correct in optimising away this check.
>
> Does adding -fno-delete-null-pointer-checks to the compile options help?
No, with -fno-delete-null-pointer-checks the 'beq' instruction is still
deleted.
-O1 works though.