re PR preprocessor/35061 (#pragma pop_macro causes ICE if no macro value on stack)

	PR preprocessor/35061
gcc
	* c-pragma.c (handle_pragma_pop_macro): Check that
	pushed_macro_table has been allocated.
testsuite
	* gcc.dg/cpp/pragma_pop_macro-1.c:  New file

From-SVN: r132322

gcc/ChangeLog

+2008-02-14  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	PR preprocessor/35061
+	* c-pragma.c (handle_pragma_pop_macro): Check that
+	pushed_macro_table has been allocated.
+
 2008-02-14  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR middle-end/35136

gcc/c-pragma.c

@@ -341,7 +341,7 @@ handle_pragma_pop_macro (cpp_reader *reader)
   enum cpp_ttype token;
   struct def_pragma_macro dummy, *c;
   const char *macroname;
-  void **slot;
+  void **slot = NULL;
 
   if (pragma_lex (&x) != CPP_OPEN_PAREN)
     GCC_BAD ("missing %<(%> after %<#pragma pop_macro%> - ignored");
@@ -367,8 +367,9 @@ handle_pragma_pop_macro (cpp_reader *reader)
 
   dummy.hash = htab_hash_string (macroname);
   dummy.name = macroname;
-  slot = htab_find_slot_with_hash (pushed_macro_table, &dummy,
-				   dummy.hash, NO_INSERT);
+  if (pushed_macro_table)
+    slot = htab_find_slot_with_hash (pushed_macro_table, &dummy,
+				     dummy.hash, NO_INSERT);
   if (slot == NULL)
     return;
   c = *slot;

gcc/testsuite/ChangeLog

+2008-02-14  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	PR preprocessor/35061
+	* gcc.dg/cpp/pragma_pop_macro-1.c:  New test.
+
 2008-02-14  Paolo Carlini  <pcarlini@suse.de>
 
         PR c++/28743

gcc/testsuite/gcc.dg/cpp/pragma-pop_macro-1.c

+/* PR preprocessor/35061 */
+/* Do nothing if there is nothing on the macro stack to pop.  */
+
+/* { dg do-preprocess { target *-*-mingw*  *-*-cygwin* } } */
+
+#define X  1
+/* # pragma push_macro("X") */
+# undef X
+# pragma pop_macro("X")
+#ifdef X
+#error X is defined
+#endif