re PR pch/47430 (Random PCH related bootstrap failures on powerpc64-linux)

	PR pch/47430
	* c-opts.c (c_common_post_options): Call c_common_no_more_pch
	after init_c_lex if pch_file is set.

From-SVN: r169276

gcc/c-family/ChangeLog

+2011-01-26  Jakub Jelinek  <jakub@redhat.com>
+
+	PR pch/47430
+	* c-opts.c (c_common_post_options): Call c_common_no_more_pch
+	after init_c_lex if pch_file is set.
+
 2011-01-26  Dave Korn  <dave.korn.cygwin@gmail.com>
 
 	PR c++/43601

gcc/c-family/c-opts.c

 /* C/ObjC/C++ command line option handling.
-   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
    Contributed by Neil Booth.
 
@@ -995,6 +995,12 @@ c_common_post_options (const char **pfilename)
     {
       init_c_lex ();
 
+      /* When writing a PCH file, avoid reading some other PCH file,
+	 because the default address space slot then can't be used
+	 for the output PCH file.  */
+      if (pch_file)
+	c_common_no_more_pch ();
+
       /* Yuk.  WTF is this?  I do know ObjC relies on it somewhere.  */
       input_location = UNKNOWN_LOCATION;
     }