-O2 flag

Friedrich Locke friedrich.locke at gmail.com
Sun Jun 11 00:05:07 UTC 2017

Here you have it:

gustav# cc --version
FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on 
LLVM 3.8.0)
Target: x86_64-unknown-freebsd11.0
Thread model: posix
InstalledDir: /usr/bin

Em 10/06/2017 18:09, Serpent7776 escreveu:
> On Sat, 10 Jun 2017 16:20:25 -0300
> Friedrich Locke <friedrich.locke at gmail.com> wrote:
>> Hi folks,
>> i am trying compile a program with cc on freebsd 11.
>> When i use -O2 compilation flag, the compiled code is giving error on
>> execution, but with i omit -O2 everything works ok.
>> Have anybody already faced such problem ?
> Yes, a few times in the past. Your code may have hidden bug which is triggered
> only with optimizations enabled. It might be relying on some kind of undefined
> behaviour.
> Unfortunately, I don't have any helpful advices on how to find this error -
> try enabling all compiler warnings flags.
> I'd suspect a bug in your code rather than a bug in compiler, but the latter is
> not impossible.
>> Thanks in advance.
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