--- gcc/config/i386/sco.h	2018/04/24 18:10:27	1.1
+++ gcc/config/i386/sco.h	2018/04/24 18:22:59	1.1.1.3
@@ -16,6 +16,11 @@
 #undef TARGET_DEFAULT
 #define TARGET_DEFAULT 0201
 
+/* Let's guess that the SCO software FPU emulator can't handle
+   80-bit XFmode insns, so don't generate them.  */
+#undef LONG_DOUBLE_TYPE_SIZE
+#define LONG_DOUBLE_TYPE_SIZE 64
+
 /* Use crt1.o as a startup file and crtn.o as a closing file.  */
 
 #undef STARTFILE_SPEC
@@ -33,7 +38,7 @@
 /* Specify predefined symbols in preprocessor.  */
 
 #undef CPP_PREDEFINES
-#define CPP_PREDEFINES "-Dunix -Di386 -DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP"
+#define CPP_PREDEFINES "-Dunix -Di386 -DM_UNIX -DM_I386 -DM_COFF -DM_WORDSWAP -Asystem(unix) -Asystem(svr3) -Acpu(i386) -Amachine(i386)"
 
 #undef CPP_SPEC
 #define CPP_SPEC "%{scointl:-DM_INTERNAT}"
@@ -62,7 +67,8 @@
 
 #undef VALUE_REGNO
 #define VALUE_REGNO(MODE) \
-  ((TARGET_80387 && ((MODE) == SFmode || (MODE) == DFmode))
+  ((TARGET_80387
+     && ((MODE) == SFmode || (MODE) == DFmode || (MODE) == XFmode)
    ? FIRST_FLOAT_REG : 0)
 
 #undef HARD_REGNO_MODE_OK
@@ -88,4 +94,7 @@
 	      == 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)  */
+
+/* Handle #pragma pack. */
+#define HANDLE_SYSV_PRAGMA