// requires constant integer expressions static int bar[] = { [__builtin_bswap16(0x1234)] = 0, // OK [__builtin_bswap32(0x1234)] = 0, // OK [__builtin_bswap64(0x1234)] = 0, // OK }; // requires constant integers static int foo(unsigned long long a) { switch (a) { case __builtin_bswap16(1 << 8): case __builtin_bswap32(2L << 24): case __builtin_bswap64(3LL << 56): return 0; default: return 1; } } /* * check-name: constness of pure/const builtins */