--- gcc/config/i386/go32.h	2018/04/24 18:10:27	1.1
+++ gcc/config/i386/go32.h	2018/04/24 18:23:10	1.1.1.3
@@ -1,5 +1,8 @@
 /* Configuration for an i386 running MS-DOS with djgpp/go32.  */
 
+/* Don't assume anything about the header files. */
+#define NO_IMPLICIT_EXTERN_C
+
 #define YES_UNDERSCORES
 
 #include "i386/gas.h"
@@ -7,4 +10,53 @@
 #ifdef CPP_PREDEFINES
 #undef CPP_PREDEFINES
 #endif
-#define CPP_PREDEFINES "-Dunix -Di386 -DGO32 -DMSDOS"
+#define CPP_PREDEFINES "-Dunix -Di386 -DGO32 -DMSDOS \
+  -Asystem(unix) -Asystem(msdos) -Acpu(i386) -Amachine(i386)"
+
+#undef EXTRA_SECTIONS
+#define EXTRA_SECTIONS in_ctor, in_dtor
+
+#undef EXTRA_SECTION_FUNCTIONS
+#define EXTRA_SECTION_FUNCTIONS					\
+  CTOR_SECTION_FUNCTION						\
+  DTOR_SECTION_FUNCTION
+
+#define CTOR_SECTION_FUNCTION					\
+void								\
+ctor_section ()							\
+{								\
+  if (in_section != in_ctor)					\
+    {								\
+      fprintf (asm_out_file, "\t.section .ctor\n");		\
+      in_section = in_ctor;					\
+    }								\
+}
+
+#define DTOR_SECTION_FUNCTION					\
+void								\
+dtor_section ()							\
+{								\
+  if (in_section != in_dtor)					\
+    {								\
+      fprintf (asm_out_file, "\t.section .dtor\n");		\
+      in_section = in_dtor;					\
+    }								\
+}
+
+#define ASM_OUTPUT_CONSTRUCTOR(FILE,NAME)	\
+  do {						\
+    ctor_section ();				\
+    fprintf (FILE, "%s\t", ASM_LONG);		\
+    assemble_name (FILE, NAME);			\
+    fprintf (FILE, "\n");			\
+  } while (0)
+
+#define ASM_OUTPUT_DESTRUCTOR(FILE,NAME)       	\
+  do {						\
+    dtor_section ();                   		\
+    fprintf (FILE, "%s\t", ASM_LONG);		\
+    assemble_name (FILE, NAME);              	\
+    fprintf (FILE, "\n");			\
+  } while (0)
+
+