--- gcc/config/svr3.h	2018/04/24 17:59:54	1.1.1.3
+++ gcc/config/svr3.h	2018/04/24 18:05:42	1.1.1.4
@@ -39,6 +39,9 @@ the Free Software Foundation, 675 Mass A
    appropriate define for the type of hardware that you are targeting.
 */
 
+/* Define a symbol indicating that we are using svr3.h.  */
+#define USING_SVR3_H
+
 /* Define a symbol so that libgcc* can know what sort of operating
    environment and assembler syntax we are targeting for.  */
 #define SVR3_target
@@ -255,9 +258,20 @@ do {								\
   INIT_SECTION_FUNCTION						\
   FINI_SECTION_FUNCTION
 
+#define BSS_SECTION_FUNCTION					\
+void								\
+bss_section ()							\
+{								\
+  if (in_section != in_bss)					\
+    {								\
+      fprintf (asm_out_file, "\t%s\n", BSS_SECTION_ASM_OP);	\
+      in_section = in_bss;					\
+    }								\
+}
+
 #define INIT_SECTION_FUNCTION					\
 void								\
-init_section ()						\
+init_section ()							\
 {								\
   if (in_section != in_init)					\
     {								\
@@ -293,7 +307,9 @@ const_section ()							\
     }									\
 }
 
-#if 0
+/* The ctors and dtors sections are not normally put into use 
+   by EXTRA_SECTIONS and EXTRA_SECTION_FUNCTIONS as defined in svr3.h,
+   but it can't hurt to define these macros for whatever systems use them.  */
 #define CTORS_SECTION_FUNCTION						\
 void									\
 ctors_section ()							\
@@ -315,7 +331,6 @@ dtors_section ()							\
       in_section = in_dtors;						\
     }									\
 }
-#endif
 
 /* This is machine-dependent
    because it needs to push something on the stack.  */