ByteOrder.h: simplify compiler test

* A problem with our gcc requires adding casts for gcc4 when
  the __builtin_bswap functions are used with a format string
* Unlike gcc2, the __builtin_bswap functions do not get disabled
  despite using -fno-builtins, hence added compiler check in
  runtime_loader/utility.cpp

headers/os/support/ByteOrder.h

@@ -120,11 +120,7 @@ extern bool is_type_swapped(type_code type);
 /* Private implementations */
 extern double __swap_double(double arg);
 extern float  __swap_float(float arg);
-#if (defined(__INTEL__) || defined(__x86_64__)) && GCC_VERSION >= 40300
+#if __GNUC__ >= 4
-#define __swap_int64(arg)	__builtin_bswap64(arg)
-#define __swap_int32(arg)	__builtin_bswap32(arg)
-#define __swap_int16(arg)	__builtin_bswap16(arg)
-#elif defined(__ARM__) && GCC_VERSION >= 40800
 #define __swap_int64(arg)	__builtin_bswap64(arg)
 #define __swap_int32(arg)	__builtin_bswap32(arg)
 #define __swap_int16(arg)	__builtin_bswap16(arg)

src/add-ons/kernel/busses/scsi/ahci/ahci_port.cpp

@@ -819,8 +819,8 @@ AHCIPort::ScsiUnmap(scsi_ccb* request, scsi_unmap_parameter_list* unmapBlocks)
 dprintf("TRIM SCSI:\n");
 for (uint32 i = 0; i < scsiRangeCount; i++) {
 	dprintf("[%3" B_PRIu32 "] %" B_PRIu64 " : %" B_PRIu32 "\n", i,
-		B_BENDIAN_TO_HOST_INT64(unmapBlocks->blocks[i].lba),
+		(uint64)B_BENDIAN_TO_HOST_INT64(unmapBlocks->blocks[i].lba),
-		B_BENDIAN_TO_HOST_INT32(unmapBlocks->blocks[i].block_count));
+		(uint32)B_BENDIAN_TO_HOST_INT32(unmapBlocks->blocks[i].block_count));
 }
 
 	uint32 scsiIndex = 0;

src/system/kernel/arch/x86/arch_debug.cpp

@@ -1330,11 +1330,11 @@ arch_debug_gdb_get_registers(char* buffer, size_t bufferSize)
 		switch (registers[i].type) {
 			case B_UINT64_TYPE:
 				result = snprintf(buffer, bufferSize, "%016" B_PRIx64,
-					B_HOST_TO_BENDIAN_INT64(registers[i].value));
+					(uint64)B_HOST_TO_BENDIAN_INT64(registers[i].value));
 				break;
 			case B_UINT32_TYPE:
 				result = snprintf(buffer, bufferSize, "%08" B_PRIx32,
-					B_HOST_TO_BENDIAN_INT32((uint32)registers[i].value));
+					(uint32)B_HOST_TO_BENDIAN_INT32((uint32)registers[i].value));
 				break;
 		}
 		if (result >= (int)bufferSize)

src/system/runtime_loader/utility.cpp

@@ -72,13 +72,14 @@ dprintf(const char *format, ...)
 	va_end(list);
 }
 
-
+#if __GNUC__ == 2
 extern "C" uint32
 __swap_int32(uint32 value)
 {
 	return value >> 24 | ((value >> 8) & 0xff00) | value << 24
 		| ((value << 8) & 0xff0000);
 }
+#endif
 
 
 // Copied from libroot/os/thread.c: