[C++ Patch] PR 60211

[Paolo Carlini]

Hi,

in this (mild) ICE on invalid 4.9/5 regression things go wrong in 
various ways when we try to use cp_parser_iteration_statement at 
top-level. I think the simplest thing to do is just returning early, 
then cp_parser_declaration will emit an appropriate diagnostic (the same 
produced when the pragma isn't there). Tested x86_64-linux.

Thanks,
Paolo.

///////////////////////
/cp
2015-02-05  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/60211
        * parser.c (cp_parser_pragma): Handle gracefully PRAGMA_IVDEP
        at pragma_external context.

/testsuite
2015-02-05  Paolo Carlini  <paolo.carl...@oracle.com>

        PR c++/60211
        * g++.dg/parse/ivdep-2.C: New.
        * g++.dg/parse/ivdep-3.C: Likewise.
Index: cp/parser.c
===================================================================
--- cp/parser.c (revision 220440)
+++ cp/parser.c (working copy)
@@ -33079,6 +33079,9 @@ cp_parser_pragma (cp_parser *parser, enum pragma_c
            cp_parser_error (parser, "for, while or do statement expected");
            return false;
          }
+       if (context == pragma_external)
+         /* cp_parser_declaration will emit a diagnostic.  */
+         return false;
        cp_parser_iteration_statement (parser, true);
        return true;
       }
Index: testsuite/g++.dg/parse/ivdep-2.C
===================================================================
--- testsuite/g++.dg/parse/ivdep-2.C    (revision 0)
+++ testsuite/g++.dg/parse/ivdep-2.C    (working copy)
@@ -0,0 +1,9 @@
+// PR c++/60211
+
+void foo()
+{}
+  int i;
+#pragma GCC ivdep
+  for (i = 0; i < 2; ++i)  // { dg-error "expected|type" }
+    ;
+}  // { dg-error "expected" }
Index: testsuite/g++.dg/parse/ivdep-3.C
===================================================================
--- testsuite/g++.dg/parse/ivdep-3.C    (revision 0)
+++ testsuite/g++.dg/parse/ivdep-3.C    (working copy)
@@ -0,0 +1,8 @@
+// PR c++/60211
+
+void foo()
+{}
+#pragma GCC ivdep
+  for (int i = 0; i < 2; ++i)  // { dg-error "expected|type" }
+    ;
+}  // { dg-error "expected" }