Is there a GCC warning that detects bit shift operations on signed types?

Question

If I read the C++ ISO specification (sections 5.8.2 and 5.8.3) right, the right-shift of negative signed types is implementation specific and the left-shift undefined behavi

Answer 1

The GCC documentation is here.

The answer appears to be "no", there's not any warning option for what you want.

I don't know why, but I'd guess that there's just so much code out there that uses this that it would be too noisy. C may not define arithmetic shifts, but pretty much all CPUs do it the same way, these days, so most people assume it is defined that way.