--- gcc/config/mips-svr4.h	2018/04/24 17:55:24	1.1
+++ gcc/config/mips-svr4.h	2018/04/24 18:06:24	1.1.1.3
@@ -19,7 +19,8 @@ the Free Software Foundation, 675 Mass A
 
 #define MIPS_SVR4
 
-#define CPP_PREDEFINES "-Dmips -Dunix -Dhost_mips -DMIPSEB -DR3000 -DSYSTYPE_SVR4"
+#define CPP_PREDEFINES "-Dmips -Dunix -Dhost_mips -DMIPSEB -DR3000 -DSYSTYPE_SVR4 \
+-D_mips -D_unix -D_host_mips -D_MIPSEB -D_R3000 -D_SYSTYPE_SVR4"
 
 #define SYSTEM_INCLUDE_DIR "/svr4/usr/include"
 
@@ -36,7 +37,7 @@ the Free Software Foundation, 675 Mass A
 %{!mgas: \
 	%{EB} %{!EB:-EB} \
 	%{EL: %e-EL not supported} \
-	%{bestGnum} \
+	%{bestGnum} %{shared} %{non_shared} \
 	%{mips1} %{mips2} %{mips3} \
 	-systype /svr4/}"
 		    
@@ -46,4 +47,25 @@ the Free Software Foundation, 675 Mass A
 
 #define MACHINE_TYPE "RISC-OS System V.4 Mips"
 
+/* Override defaults for finding the MIPS tools.  */
+#define MD_STARTFILE_PREFIX "/svr4/usr/lib/cmplrs/cc/"
+#define MD_EXEC_PREFIX "/svr4/usr/lib/cmplrs/cc/"
+
+/* Mips System V.4 doesn't have a getpagesize() function needed by the
+   trampoline code, so use the POSIX sysconf function to get it.
+   This is only done when compiling the trampoline code.  */
+
+#ifdef  L_trampoline
+#include <unistd.h>
+
+#define getpagesize()	sysconf(_SC_PAGE_SIZE)
+#endif /*  L_trampoline */
+
+/* Use atexit for static constructors/destructors, instead of defining
+   our own exit function.  */
+#define HAVE_ATEXIT
+
+/* Generate calls to memcpy, etc., not bcopy, etc.  */
+#define TARGET_MEM_FUNCTIONS
+
 #include "mips.h"