[Bug middle-end/34454] [4.3 regression] Overflow check is optimized away when -O2 is enabled

[ian at airs dot com]

------- Comment #4 from ian at airs dot com  2007-12-13 20:37 -------
Note that this gives a warning with -Wstrict-overflow.

And note that you get the desired behaviour if you compile with
-fno-strict-overflow.

As Pinski says, the code is simply incorrect according to standard C, but you
can use the -Wstrict-overflow and -fno-strict-overflow options to help fix
existing code bases.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34454