gcc/config/pa/pa64-start.h - gcc - Git at Google

 /* It is currently impossible to switch between PA32 and PA64 based on a
    runtime compiler switch.  So we might as well lose the overhead with
    checking for TARGET_64BIT.  */
 #define TARGET_64BIT 1
 #define TARGET_PA_11 1
 #define TARGET_PA_20 1
	/* It is currently impossible to switch between PA32 and PA64 based on a
	runtime compiler switch. So we might as well lose the overhead with
	checking for TARGET_64BIT. */
	#define TARGET_64BIT 1
	#define TARGET_PA_11 1
	#define TARGET_PA_20 1