(CPP_SPEC): Define -D__i486__ if compile for i486.

(ASM_OUTPUT_ADDR_DIFF_ELT, JUMP_TABLES_IN_TEXT_SECTION):
Copy definitions from i386v4.h to get PIC code correct.
(FUNCTION_PROFILER): Copy definition from i386bsd.h.
(COMMENT_BEGIN, ASM_APP_ON, ASM_APP_OFF): Copy from i386bsd.h
to prepare for new GAS.

From-SVN: r2967

gcc/config/i386/linux.h

@@ -27,6 +27,13 @@
 #undef CPP_PREDEFINES
 #define CPP_PREDEFINES "-Dunix -Di386 -Dlinux"
 
+#undef CPP_SPEC
+#if TARGET_CPU_DEFAULT == 2
+#define CPP_SPEC "%{!m386:-D__i486__} %{posix:-D_POSIX_SOURCE}"
+#else
+#define CPP_SPEC "%{m486:-D__i486__} %{posix:-D_POSIX_SOURCE}"
+#endif
+
 #undef SIZE_TYPE
 #define SIZE_TYPE "unsigned int"
 
@@ -82,3 +89,50 @@
 #define GPLUSPLUS_INCLUDE_DIR "/usr/g++-include"
 
 #endif
+
+/* The following macros are copied from i386bsd.h.  */
+
+/* Redefine this to use %eax instead of %edx.  */
+#undef FUNCTION_PROFILER
+#define FUNCTION_PROFILER(FILE, LABELNO)  \
+{									\
+  if (flag_pic)								\
+    {									\
+      fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%eax\n",		\
+	       LPREFIX, (LABELNO));					\
+      fprintf (FILE, "\tcall *_mcount@GOT(%%ebx)\n");			\
+    }									\
+  else									\
+    {									\
+      fprintf (FILE, "\tmovl $%sP%d,%%eax\n", LPREFIX, (LABELNO));	\
+      fprintf (FILE, "\tcall _mcount\n");				\
+    }									\
+}
+
+/* There are conflicting reports about whether this system uses
+   a different assembler syntax.  wilson@cygnus.com says # is right.  */
+#undef COMMENT_BEGIN
+#define COMMENT_BEGIN "#"
+
+#undef ASM_APP_ON
+#define ASM_APP_ON "#APP\n"
+
+#undef ASM_APP_OFF
+#define ASM_APP_OFF "#NO_APP\n"
+
+/* The following macros are copied from i386v4.h.  */
+
+/* These have to be defined to get PIC code correct */
+
+/* This is how to output an element of a case-vector that is relative.
+   This is only used for PIC code.  See comments by the `casesi' insn in
+   i386.md for an explanation of the expression this outputs. */
+
+#undef ASM_OUTPUT_ADDR_DIFF_ELT
+#define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
+  fprintf (FILE, "\t.long _GLOBAL_OFFSET_TABLE_+[.-%s%d]\n", LPREFIX, VALUE)
+
+/* Indicate that jump tables go in the text section.  This is
+   necessary when compiling PIC code.  */
+
+#define JUMP_TABLES_IN_TEXT_SECTION