--- gcc/config/i386/isc.h	2018/04/24 18:10:27	1.1
+++ gcc/config/i386/isc.h	2018/04/24 18:31:01	1.1.1.3
@@ -6,15 +6,20 @@
 #undef STARTFILE_SPEC
 #define STARTFILE_SPEC \
   "%{!shlib:%{posix:%{pg:mcrtp1.o%s}%{!pg:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}}\
-   %{!posix:%{pg:mcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}\
-   %{p:-L/lib/libp} %{pg:-L/lib/libp}}}\
-   %{shlib:%{posix:crtp1.o%s}%{!posix:crt1.o%s}} crtbegin.o%s"
+   %{Xp:%{pg:mcrtp1.o%s}%{!pg:%{p:mcrtp1.o%s}%{!p:crtp1.o%s}}}\
+   %{!posix:%{!Xp:%{pg:mcrt1.o%s}%{!pg:%{p:mcrt1.o%s}%{!p:crt1.o%s}}\
+   %{p:-L/lib/libp} %{pg:-L/lib/libp}}}}\
+   %{shlib:%{Xp:crtp1.o%s}%{posix:crtp1.o%s}%{!posix:%{!Xp:crt1.o%s}}}\
+   crtbegin.o%s"
   
 #define ENDFILE_SPEC "crtend.o%s crtn.o%s"
 
 /* Library spec */
 #undef LIB_SPEC
-#define LIB_SPEC "%{shlib:-lc_s} %{posix:-lcposix} -lc -lg"
+#define LIB_SPEC "%{shlib:-lc_s} %{posix:-lcposix} %{Xp:-lcposix} -lc -lg"
+
+#undef CPP_SPEC
+#define CPP_SPEC "%{posix:-D_POSIX_SOURCE} %{Xp:-D_POSIX_SOURCE}"
 
 /* ISC 2.2 uses `char' for `wchar_t'.  */
 #undef WCHAR_TYPE
@@ -31,7 +36,7 @@
    structures. */
 
 #undef RETURN_POPS_ARGS
-#define RETURN_POPS_ARGS(FUNTYPE,SIZE)   \
+#define RETURN_POPS_ARGS(FUNDECL,FUNTYPE,SIZE)   \
   (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE ? 0			\
    : (TARGET_RTD						\
       && (TYPE_ARG_TYPES (FUNTYPE) == 0				\
@@ -39,7 +44,7 @@
 	      == void_type_node))) ? (SIZE)			\
    : 0)
 /* On other 386 systems, the last line looks like this:
-   : (aggregate_value_p (FUNTYPE)) ? GET_MODE_SIZE (Pmode) : 0)  */
+   : (aggregate_value_p (TREE_TYPE (FUNTYPE))) ? GET_MODE_SIZE (Pmode) : 0)  */
 #endif
 
 /* Handle #pragma pack and #pragma weak.  */
@@ -55,3 +60,30 @@
 
 #undef TARGET_DEFAULT
 #define TARGET_DEFAULT 0201
+
+/* The ISC 2.0.2 software FPU emulator apparently can't handle
+   80-bit XFmode insns, so don't generate them.  */
+#undef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE 64
+
+/* The ISC assembler does not like a .file directive with a name
+   longer than 14 characters.  Truncating it will not permit
+   debugging to work properly, but at least we won't get an error
+   message.  */
+
+#undef ASM_FILE_START
+#define ASM_FILE_START(FILE)                     \
+  do {                                           \
+   char c;                                       \
+   int max = 0;                                  \
+   char *string = dump_base_name;                \
+                                                 \
+    fputs ("\t.file\t\"", FILE);				 \
+                                                 \
+    while ((c = *string++) != 0 && max++ < 14) { \
+       if (c == '\"' || c == '\\')               \
+         putc ('\\', FILE);                      \
+       putc (c, FILE);                           \
+    }                                            \
+    fputs ("\"\n", FILE);                        \
+  } while (0)