https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65435
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> --- OpenSSL of course. 136 << 24 is not representable in int. This is undefined behavior in C99/C11, and defined behavior in C++11. Quoting C99 6.5.7/4: "The result of E1 << E2 is E1 left-shifted E2 bit positions; vacated bits are filled with zeros. If E1 has an unsigned type, the value of the result is E1 × 2 ^ E2, reduced modulo one more than the maximum value representable in the result type. If E1 has a signed type and nonnegative value, and E1 × 2 ^ E2 is representable in the result type, then that is the resulting value; otherwise, the behavior is undefined."