__x86_64__ 479 gc/include/gc.h # if defined(__i386__) || defined(__x86_64__) __x86_64__ 229 gc/include/private/gcconfig.h # if defined(LINUX) && defined(__x86_64__) __x86_64__ 329 gc/include/private/gcconfig.h # if defined(__NetBSD__) && defined(__x86_64__)