[Bug c/67433] ?: expression returns unexpected value when condition is a bool variable which memory is not true/false

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67433

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to xuejuncao from comment #4)
> btw, the same code works fine on Mac:
> 
> $gcc --version
> Configured with: --prefix=/Library/Developer/CommandLineTools/usr
> --with-gxx-include-dir=/usr/include/c++/4.2.1
> Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
> Target: x86_64-apple-darwin14.5.0
> Thread model: posix

So this is undefined behavior.