From 6602c25c0c78219690f09e727cdb016990e6f3c3 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <dgregor@apple.com>
Date: Fri, 30 Apr 2010 02:51:06 +0000
Subject: [PATCH] Add Clang version inspection macros. Fixes PR6681.

llvm-svn: 102686
---
 clang/docs/LanguageExtensions.html      | 39 ++++++++++++++++++++++++-
 clang/lib/Frontend/InitPreprocessor.cpp | 16 +++++++++-
 clang/test/Preprocessor/init.c          |  4 +++
 3 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/clang/docs/LanguageExtensions.html b/clang/docs/LanguageExtensions.html
index 9779c3ff441f..838b65f27b81 100644
--- a/clang/docs/LanguageExtensions.html
+++ b/clang/docs/LanguageExtensions.html
@@ -199,7 +199,44 @@ is used in the file argument.</p>
 <h2 id="builtinmacros">Builtin Macros</h2>
 <!-- ======================================================================= -->
 
-<p>__BASE_FILE__, __INCLUDE_LEVEL__, __TIMESTAMP__, __COUNTER__</p>
+<dl>
+  <dt><code>__BASE_FILE__</code></dt>
+  <dd>Defined to a string that contains the name of the main input
+  file passed to Clang.</dd> 
+
+  <dt><code>__COUNTER__</code></dt>
+  <dd>Defined to an integer value that starts at zero and is
+  incremented each time the <code>__COUNTER__</code> macro is
+  expanded.</dd> 
+    
+  <dt><code>__INCLUDE_LEVEL__</code></dt>
+  <dd>Defined to an integral value that is the include depth of the
+  file currently being translated. For the main file, this value is
+  zero.</dd> 
+
+  <dt><code>__TIMESTAMP__</code></dt>
+  <dd>Defined to the date and time of the last modification of the
+  current source file.</dd> 
+    
+  <dt><code>__clang__</code></dt>
+  <dd>Defined when compiling with Clang</dd>
+
+  <dt><code>__clang_major__</code></dt>
+  <dd>Defined to the major version number of Clang (e.g., the 2 in
+  2.0.1).</dd> 
+
+  <dt><code>__clang_minor__</code></dt>
+  <dd>Defined to the minor version number of Clang (e.g., the 0 in
+  2.0.1).</dd> 
+
+  <dt><code>__clang_patchlevel__</code></dt>
+  <dd>Defined to the patch level of Clang (e.g., the 1 in 2.0.1).</dd>
+
+  <dt><code>__clang_version__</code></dt>
+  <dd>Defined to a string that captures the Clang version, including
+  the Subversion tag or revision number, e.g., "1.5 (trunk
+  102332)".</dd> 
+</dl>
 
 <!-- ======================================================================= -->
 <h2 id="vectors">Vectors and Extended Vectors</h2>
diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index e035afd70779..f1e9819d83ca 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -11,6 +11,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/Basic/Version.h"
 #include "clang/Frontend/Utils.h"
 #include "clang/Basic/MacroBuilder.h"
 #include "clang/Basic/TargetInfo.h"
@@ -212,7 +213,20 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
   // Compiler version introspection macros.
   Builder.defineMacro("__llvm__");  // LLVM Backend
   Builder.defineMacro("__clang__"); // Clang Frontend
-
+#define TOSTR2(X) #X
+#define TOSTR(X) TOSTR2(X)
+  Builder.defineMacro("__clang_major__", TOSTR(CLANG_VERSION_MAJOR));
+  Builder.defineMacro("__clang_minor__", TOSTR(CLANG_VERSION_MINOR));
+#ifdef CLANG_VERSION_PATCHLEVEL
+  Builder.defineMacro("__clang_patchlevel__", TOSTR(CLANG_VERSION_PATCHLEVEL));
+#else
+  Builder.defineMacro("__clang_patchlevel__", "0");
+#endif
+  Builder.defineMacro("__clang_version__", 
+                      "\"" CLANG_VERSION_STRING " ("
+                      + getClangFullRepositoryVersion() + ")\"");
+#undef TOSTR
+#undef TOSTR2
   // Currently claim to be compatible with GCC 4.2.1-5621.
   Builder.defineMacro("__GNUC_MINOR__", "2");
   Builder.defineMacro("__GNUC_PATCHLEVEL__", "1");
diff --git a/clang/test/Preprocessor/init.c b/clang/test/Preprocessor/init.c
index 4ef460bbc6e4..7909921784b7 100644
--- a/clang/test/Preprocessor/init.c
+++ b/clang/test/Preprocessor/init.c
@@ -48,6 +48,10 @@
 // COMMON:#define __STDC__ 1
 // COMMON:#define __VERSION__
 // COMMON:#define __clang__ 1
+// COMMON:#define __clang_major__ 2
+// COMMON:#define __clang_minor__ 0
+// COMMON:#define __clang_patchlevel__ 0
+// COMMON:#define __clang_version__ "2.0 (trunk 102685)"
 // COMMON:#define __llvm__ 1
 //
 //