re PR target/47997 (gcc on macosx: "ld: warning: -fwritable-strings not…

re PR target/47997 (gcc on macosx: "ld: warning: -fwritable-strings not compatible with literal CF/NSString")


	PR target/47997
	* config/darwin.c (darwin_mergeable_string_section): Place string
	constants in '.cstring' rather than '.const' when CF/NSStrings are
	active.

From-SVN: r175410

gcc/ChangeLog

+2011-06-25  Iain Sandoe  <iains@gcc.gnu.org>
+
+	PR target/47997
+	* config/darwin.c (darwin_mergeable_string_section): Place string
+	constants in '.cstring' rather than '.const' when CF/NSStrings are
+	active.
+
 2011-06-26  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* config/sparc/sparc.c (save_local_or_in_reg_p): Adjust comment.

gcc/config/darwin.c

@@ -1195,7 +1195,11 @@ static section *
 darwin_mergeable_string_section (tree exp,
 				 unsigned HOST_WIDE_INT align)
 {
-  if (flag_merge_constants
+  /* Darwin's ld expects to see non-writable string literals in the .cstring 
+     section.  Later versions of ld check and complain when CFStrings are 
+     enabled.  Therefore we shall force the strings into .cstring since we
+     don't support writable ones anyway.  */
+  if ((darwin_constant_cfstrings || flag_merge_constants)
       && TREE_CODE (exp) == STRING_CST
       && TREE_CODE (TREE_TYPE (exp)) == ARRAY_TYPE
       && align <= 256