From: Ted Kremenek <kremenek@apple.com>
Date: Tue, 27 Jul 2010 02:58:57 +0000 (+0000)
Subject: PTH generation: Don't save the leading '#' token in a null directive.  This unbreaks... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5c53f4cb1e46691d788db27153b406869cc4c53f;p=clang

PTH generation: Don't save the leading '#' token in a null directive.  This unbreaks using PTH with Boost (<rdar://problem/8227989>).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109484 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/CacheTokens.cpp b/lib/Frontend/CacheTokens.cpp
index a5fcebe994..53f7362ac2 100644
--- a/lib/Frontend/CacheTokens.cpp
+++ b/lib/Frontend/CacheTokens.cpp
@@ -311,14 +311,19 @@ PTHEntry PTHWriter::LexTokens(Lexer& L) {
       // the next token.
       assert(!ParsingPreprocessorDirective);
       Offset HashOff = (Offset) Out.tell();
-      EmitToken(Tok);
 
       // Get the next token.
-      L.LexFromRawLexer(Tok);
+      Token NextTok;
+      L.LexFromRawLexer(NextTok);
 
-      // If we see the start of line, then we had a null directive "#".
-      if (Tok.isAtStartOfLine())
+      // If we see the start of line, then we had a null directive "#".  In
+      // this case, discard both tokens.
+      if (NextTok.isAtStartOfLine())
         goto NextToken;
+      
+      // The token is the start of a directive.  Emit it.
+      EmitToken(Tok);
+      Tok = NextTok;
 
       // Did we see 'include'/'import'/'include_next'?
       if (Tok.isNot(tok::identifier)) {