Fix mips16 libstdc++ builds. Fix inconsistency from Apr 7 change.

	* mips/elf64.h (MAKE_DECL_ONE_ONLY, UNIQUE_SECTION_P): Define.
	* mips/mips.c (mips_select_rtx_section): When TARGET_MIPS16, use
	function_section instead of text_section.
	* mips/mips.h (ENCODE_SECTION_INFO): Add check for UNIQUE_SECTION_P
	in TARGET_MIPS16 STRING_CST handling.

From-SVN: r26824

gcc/ChangeLog

+Fri May  7 12:38:54 1999  Jim Wilson  <wilson@cygnus.com>
+
+	* mips/elf64.h (MAKE_DECL_ONE_ONLY, UNIQUE_SECTION_P): Define.
+	* mips/mips.c (mips_select_rtx_section): When TARGET_MIPS16, use
+	function_section instead of text_section.
+	* mips/mips.h (ENCODE_SECTION_INFO): Add check for UNIQUE_SECTION_P
+	in TARGET_MIPS16 STRING_CST handling.
+
 Fri May  7 09:54:11 1999  Nick Clifton  <nickc@cygnus.com>
 
 	Patch from: Nick Burrett  <nick.burrett@btinternet.com>

gcc/config/mips/elf64.h

@@ -195,6 +195,8 @@ do {									 \
   fputc ('\n', FILE);				\
  } while (0)
 
+#define MAKE_DECL_ONE_ONLY(DECL) (DECL_WEAK (DECL) = 1)
+#define UNIQUE_SECTION_P(DECL) (DECL_ONE_ONLY (DECL))
 #define UNIQUE_SECTION(DECL,RELOC)					   \
 do {									   \
   int len, size, sec;							   \

gcc/config/mips/mips.c

@@ -6884,10 +6884,10 @@ mips_select_rtx_section (mode, x)
 {
   if (TARGET_MIPS16)
     {
-      /* In mips16 mode, the constant table always goes in the .text
-         section, so that constants can be loaded using PC relative
+      /* In mips16 mode, the constant table always goes in the same section
+         as the function, so that constants can be loaded using PC relative
          addressing.  */
-      text_section ();
+      function_section (current_function_decl);
     }
   else if (TARGET_EMBEDDED_DATA)
     {

gcc/config/mips/mips.h

@@ -3168,7 +3168,20 @@ do									\
     if (TARGET_MIPS16)							\
       {									\
 	if (TREE_CODE (DECL) == STRING_CST				\
-	    && ! flag_writable_strings)					\
+	    && ! flag_writable_strings					\
+	    /* If this string is from a function, and the function will	\
+	       go in a gnu linkonce section, then we can't directly	\
+	       access the string.  This gets an assembler error		\
+	       "unsupported PC relative reference to different section".\
+	       If we modify SELECT_SECTION to put it in function_section\
+	       instead of text_section, it still fails because		\
+	       DECL_SECTION_NAME isn't set until assemble_start_function.\
+	       If we fix that, it still fails because strings are shared\
+	       among multiple functions, and we have cross section	\
+	       references again.  We force it to work by putting string	\
+	       addresses in the constant pool and indirecting.  */	\
+	    && (! current_function_decl					\
+		|| ! UNIQUE_SECTION_P (current_function_decl)))		\
 	  {								\
 	    SYMBOL_REF_FLAG (XEXP (TREE_CST_RTL (DECL), 0)) = 1;	\
 	    mips_string_length += TREE_STRING_LENGTH (DECL);		\