[Bug c/79546] Strange error: missed loop optimization, the loop counter may overflow [-Werror=unsafe-loop-optimizations]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79546 Richard W.M. Jones changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #2 from Richard W.M. Jones --- I think the warning is enabled by the build system. It's not something we enable explicitly. Anyhow I have disabled it since it seems as if this warning doesn't indicate a bug in the code.
[Bug c/79546] Strange error: missed loop optimization, the loop counter may overflow [-Werror=unsafe-loop-optimizations]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79546 --- Comment #1 from Andrew Pinski --- >-Werror=unsafe-loop-optimizations That is not enabled by default even with -Werror -W -Wall. But "missed loop optimization, the loop counter may overflow" is basically saying if i was an signed integer, the loop counter would overflow in some cases. The case depends the value of len. The only way to fix this would be rewrite the code so that case would not happen. The cases where it would happen is len = SIZET_MIN ... SIZET_MIN-0x0FFF (if I did my math correctly).
