From 4ce3e43a4ec93b15b2e7ac1b8075632655d883f5 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <doug.gregor@gmail.com>
Date: Tue, 18 May 2010 18:13:10 +0000
Subject: [PATCH] Merge BOOST_CLANG from trunk r62089.

[SVN r62090]
---
 doc/macro_reference.qbk                 | 3 +++
 include/boost/config/compiler/clang.hpp | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/doc/macro_reference.qbk b/doc/macro_reference.qbk
index 3a96512e..c32ea618 100644
--- a/doc/macro_reference.qbk
+++ b/doc/macro_reference.qbk
@@ -831,6 +831,9 @@ PPPPP is the compiler build number.
 Defined if the compiler is an Intel compiler, takes the same value as the
 compiler version macro.
 ]]
+[[`BOOST_CLANG`][`<boost/config.hpp>`][
+Defined to 1 if the compiler is the Clang compiler.
+]]
 [[`BOOST_WINDOWS`][`<boost/config.hpp>`][
 Defined if the Windows platfrom API is available.
 ]]
diff --git a/include/boost/config/compiler/clang.hpp b/include/boost/config/compiler/clang.hpp
index 2375d6eb..90cc6aa6 100644
--- a/include/boost/config/compiler/clang.hpp
+++ b/include/boost/config/compiler/clang.hpp
@@ -62,3 +62,7 @@
 #ifndef BOOST_COMPILER
 #  define BOOST_COMPILER "Clang version " __clang_version__
 #endif
+
+// Macro used to identify the Clang compiler.
+#define BOOST_CLANG 1
+