http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57693
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |manu at gcc dot gnu.org
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
> Both:
> b += b++;
> And
> d += d++;
>
> are undefined what value b and d is going to be as there are no sequence
> point intbetween the two assignments.
>
> They could be:
> temp = b;
> b++;
> b += temp;
>
> or b++;
> b+=b;
Please, could we make more use of the FAQ?
http://gcc.gnu.org/wiki/FAQ#undefinedbut
If you think the answer does not provide enough information, just extend the
answer there. (it could mention some example, and -Wsequence-points).
Otherwise, we have the same back and forth over and over again to the
frustration of users and the time waste of developers: what is UB? but my
program worked before! but my program works without optimizations! but I know
how it should work! can't gcc be consistent? but UB should not affect my
problem! I think this should not be UB!
