[PATCH] Lex: Don't lex after getting EOF when handling _Pragma

[David Majnemer]

Hi rsmith,

The error recovery path in _Pragma attempted to lex past the non-string
literal token and then lex past a closing right paren if it exists.

However, this path wasn't careful in the face of EOF.

This fixes PR20662.

http://reviews.llvm.org/D4914

Files:
  lib/Lex/Pragma.cpp
  test/Preprocessor/_Pragma.c

Index: lib/Lex/Pragma.cpp
===================================================================
--- lib/Lex/Pragma.cpp
+++ lib/Lex/Pragma.cpp
@@ -193,7 +193,7 @@
   if (!tok::isStringLiteral(Tok.getKind())) {
     Diag(PragmaLoc, diag::err__Pragma_malformed);
     // Skip this token, and the ')', if present.
-    if (Tok.isNot(tok::r_paren))
+    if (Tok.isNot(tok::eof) && Tok.isNot(tok::r_paren))
       Lex(Tok);
     if (Tok.is(tok::r_paren))
       Lex(Tok);
Index: test/Preprocessor/_Pragma.c
===================================================================
--- test/Preprocessor/_Pragma.c
+++ test/Preprocessor/_Pragma.c
@@ -11,3 +11,5 @@
 #ifdef macro
 #error #define invalid
 #endif
+
+_Pragma( // expected-error {{_Pragma takes a parenthesized string literal}}
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