Clang, the default compiler on most architectures, have -fwrapv flag enabled by default.
GCC also does not include -fstrict-overflow into -O2 optimization option.
This tells the compiler to treat signed integer overflows as defined,
preventing optimizations which remove security critical overflow checks.
This is another example of sane defaults.
Details:
- clang-local(1) - OpenBSD manual pages
- clang(1) - OpenBSD manual pages
- gcc-local(1) - OpenBSD manual pages
- gcc(1) - OpenBSD manual pages