[Bug c/29592] New: Unending loops

["darkjames at darkjames dot ath dot cx" <gcc-bugzilla at gcc dot gnu dot org>]

After compilation test1.c with -O2 program loops unending.. Yeah I know is
possible cause -fstrict-aliasing and program works compilated with -O2 &&
-fno-strict-aliasing 
It works too if it was compilated just only with -fstrict-aliasing so it loops
when some other optimization was turned on.

It works too (not loops unending) if in loop while (* ((char *) str))
we `printf("0x%x\n", str);` (maybe some other code which evaluate and use that
exp works too, i don't really know) [test2.c]

If it's not gcc bug, I'm really sorry inconvience.. (something code like that
was used in ekg2 
#v+
(functions:
http://webcvs.ekg2.org/_checkout_/ekg2/plugins/ncurses/ecurses.c?rev=1.3 

usage:
while (__S(str, 0)) {           /* while (*str)  */
        __SN(&str, 1);                  /* str++ */
        attr++;
}
loops unending, however if __SN() was declared not inline it works... for me it
was really strange, in testcases keyword 'inline' doesn't change behavior.
#v-

If it's not gcc bug, but mine, once again i'm really sorry... Sorry for me
English too.

testcase tested with:
gcc (GCC) 4.1.1 (Gentoo 4.1.1-r1)
gcc (GCC) 4.0.3 (Ubuntu 4.0.3-1ubuntu5)
gcc (GCC) 4.1.0 (SUSE Linux)


-- 
           Summary: Unending loops
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: darkjames at darkjames dot ath dot cx
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29592