re PR objc/31013 (objc PCH is broken on powerpc-darwin again)

	PR 31013
	* gccspec.c (lang_specific_driver): Do nothing when NEXT_OBJC_RUNTIME
	is declared.
	* config/darwin.h (REAL_LIBGCC_SPEC): When -fgnu-runtime is
	passed, use shared libgcc.

From-SVN: r122709

gcc/ChangeLog

+2007-03-08  Geoffrey Keating  <geoffk@apple.com>
+
+	PR 31013
+	* gccspec.c (lang_specific_driver): Do nothing when NEXT_OBJC_RUNTIME
+	is declared.
+	* config/darwin.h (REAL_LIBGCC_SPEC): When -fgnu-runtime is
+	passed, use shared libgcc.
+
 2007-03-08  Roger Sayle  <roger@eyesopen.com>
 
 	* tree-eh.c (do_return_redirection): Call build_gimple_modify_stmt

gcc/config/darwin.h

@@ -351,7 +351,7 @@ extern GTY(()) int darwin_ms_struct;
 #undef REAL_LIBGCC_SPEC
 #define REAL_LIBGCC_SPEC						   \
    "%{static-libgcc|static: -lgcc_eh -lgcc;				   \
-      shared-libgcc|fexceptions:					   \
+      shared-libgcc|fexceptions|fgnu-runtime:				   \
        %:version-compare(!> 10.5 mmacosx-version-min= -lgcc_s.10.4)	   \
        %:version-compare(>= 10.5 mmacosx-version-min= -lgcc_s.10.5)	   \
        -lgcc;								   \

gcc/gccspec.c

@@ -30,7 +30,10 @@ lang_specific_driver (int *in_argc ATTRIBUTE_UNUSED,
 		      const char *const **in_argv ATTRIBUTE_UNUSED,
 		      int *in_added_libraries ATTRIBUTE_UNUSED)
 {
-#ifdef ENABLE_SHARED_LIBGCC
+  /* Systems which use the NeXT runtime by default should arrange
+     for the shared libgcc to be used when -fgnu-runtime is passed
+     through specs.  */
+#if defined(ENABLE_SHARED_LIBGCC) && ! defined(NEXT_OBJC_RUNTIME)
   int i;
 
   /* The new argument list will be contained in this.  */