From f19e192f68a2ebfad5286ab085db925cbd0c65b6 Mon Sep 17 00:00:00 2001
From: Douglas Gregor <doug.gregor@gmail.com>
Date: Tue, 18 May 2010 17:55:32 +0000
Subject: [PATCH] Add a BOOST_CLANG macro to indicate when Clang is used.

[SVN r62089]
---
 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 ac46a412..0843da53 100644
--- a/doc/macro_reference.qbk
+++ b/doc/macro_reference.qbk
@@ -835,6 +835,9 @@ 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 53339b4c..e5a682b2 100644
--- a/include/boost/config/compiler/clang.hpp
+++ b/include/boost/config/compiler/clang.hpp
@@ -69,3 +69,7 @@
 #ifndef BOOST_COMPILER
 #  define BOOST_COMPILER "Clang version " __clang_version__
 #endif
+
+// Macro used to identify the Clang compiler.
+#define BOOST_CLANG 1
+