Fixed compatibiity with non-GCC compilers.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@13296 27425a3e-05d8-49a3-a47f-9c15f0e5edd8

os/common/ports/ARMCMx/chcore_v7m.c

@@ -124,14 +124,16 @@ void SVC_Handler(void) {
 /*lint -restore*/
   uint32_t psp = __get_PSP();
 
-  chDbgAssert(((uint32_t)__builtin_return_address(0) & 4U) != 0U,
-              "not process");
-
 #if PORT_USE_SYSCALL == TRUE
   uint32_t control;
   /* Caller context.*/
   struct port_extctx *ectxp = (struct port_extctx *)psp;
 
+#if defined(__GNUC__)
+  chDbgAssert(((uint32_t)__builtin_return_address(0) & 4U) != 0U,
+              "not process");
+#endif
+
   /* Checking if the SVC instruction has been used from privileged or
      non-privileged mode.*/
   control = __get_CONTROL();