mingw-w64-crt/gdtoa/gd_arith.h - mingw-w64 - Git at Google

 #define IEEE_8087
 #define Arith_Kind_ASL 1
 #define Double_Align
 #ifdef _WIN64
 #define X64_bit_pointers
 #endif /* w64 */
	#define IEEE_8087
	#define Arith_Kind_ASL 1
	#define Double_Align
	#ifdef _WIN64
	#define X64_bit_pointers
	#endif /* w64 */