From a0f2d02d166880e5d826074b6c2ecbf64f8ca70d Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Wed, 9 Jan 2013 02:20:00 +0000
Subject: [PATCH] Make __has_include a bit more resilient in the presence of
 macros.  <rdar://problem/12748859>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171939 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Lex/PPMacroExpansion.cpp    | 10 ++++++++--
 test/Preprocessor/has_include.c | 27 +++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 3de6cdb39d..1b8fcbac33 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -985,8 +985,14 @@ static bool EvaluateHasIncludeCommon(Token &Tok,
     // Save '(' location for possible missing ')' message.
     LParenLoc = Tok.getLocation();
 
-    // Get the file name.
-    PP.getCurrentLexer()->LexIncludeFilename(Tok);
+    if (PP.getCurrentLexer()) {
+      // Get the file name.
+      PP.getCurrentLexer()->LexIncludeFilename(Tok);
+    } else {
+      // We're in a macro, so we can't use LexIncludeFilename; just
+      // grab the next token.
+      PP.Lex(Tok);
+    }
   }
 
   // Reserve a buffer to get the spelling.
diff --git a/test/Preprocessor/has_include.c b/test/Preprocessor/has_include.c
index 10f7795fc3..985501a215 100644
--- a/test/Preprocessor/has_include.c
+++ b/test/Preprocessor/has_include.c
@@ -64,6 +64,33 @@
   #error "defined(__has_include_next) failed (8)."
 #endif
 
+// Fun with macros
+#define MACRO1 __has_include(<stdint.h>)
+#define MACRO2 ("stdint.h")
+#define MACRO3 ("blahblah.h")
+#define MACRO4 blahblah.h>)
+#define MACRO5 <stdint.h>
+
+#if !MACRO1
+  #error "__has_include with macro failed (1)."
+#endif
+
+#if !__has_include MACRO2
+  #error "__has_include with macro failed (2)."
+#endif
+
+#if __has_include MACRO3
+  #error "__has_include with macro failed (3)."
+#endif
+
+#if __has_include(<MACRO4
+  #error "__has_include with macro failed (4)."
+#endif
+
+#if !__has_include(MACRO5)
+  #error "__has_include with macro failed (2)."
+#endif
+
 // Try badly formed expressions.
 // FIXME: We can recover better in almost all of these cases. (PR13335)
 
-- 
2.50.1