* Joseph Myers: > I was supposing a build-time decision (using GCC_GLIBC_VERSION_GTE_IFELSE > to know if the glibc version on the target definitely has this function). > But if we add a header declaration, you could check for __memcmpeq being > declared (and so cover arbitrary C libraries, not just glibc, and avoid > issues of needing to disable this logic for freestanding compilations, > which would otherwise be an issue if a glibc-target toolchain is used for > a freestanding kernel compilation). The case of people calling > __builtin_memcmp (or declaring memcmp themselves) without string.h > included probably isn't one it's important to optimize.
The header-less case looks relevant to C++ and other language front ends, though. So a GCC_GLIBC_VERSION_GTE_IFELSE check could still make sense for them. (Dropping libc-coord.) Thanks, Florian
