From 6e34aea93c71e3ac1667f93357695551e2ced09d Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 19 Sep 2012 14:04:13 -0400
Subject: Clang: Split Compiler/Clang* modules out from GNU (#13550)

While Clang presents an almost identical interface to GNU there will be
some differences.  Split the compiler information modules to allow
separate rules for Clang.  Start by loading the GNU rules but leave a
place to add Clang-specific information.
---
 Modules/Compiler/Clang-ASM.cmake |  6 +++++-
 Modules/Compiler/Clang-C.cmake   |  3 ++-
 Modules/Compiler/Clang-CXX.cmake |  3 ++-
 Modules/Compiler/Clang.cmake     | 25 +++++++++++++++++++++++++
 4 files changed, 34 insertions(+), 3 deletions(-)
 create mode 100644 Modules/Compiler/Clang.cmake

diff --git a/Modules/Compiler/Clang-ASM.cmake b/Modules/Compiler/Clang-ASM.cmake
index a908b60..16c9c15 100644
--- a/Modules/Compiler/Clang-ASM.cmake
+++ b/Modules/Compiler/Clang-ASM.cmake
@@ -1 +1,5 @@
-include(Compiler/GNU-ASM)
+include(Compiler/Clang)
+
+set(CMAKE_ASM_SOURCE_FILE_EXTENSIONS s;S;asm)
+
+__compiler_clang(ASM)
diff --git a/Modules/Compiler/Clang-C.cmake b/Modules/Compiler/Clang-C.cmake
index f7baf68..98fcd0b 100644
--- a/Modules/Compiler/Clang-C.cmake
+++ b/Modules/Compiler/Clang-C.cmake
@@ -1 +1,2 @@
-include(Compiler/GNU-C)
+include(Compiler/Clang)
+__compiler_clang(C)
diff --git a/Modules/Compiler/Clang-CXX.cmake b/Modules/Compiler/Clang-CXX.cmake
index d3c403a..486e2af 100644
--- a/Modules/Compiler/Clang-CXX.cmake
+++ b/Modules/Compiler/Clang-CXX.cmake
@@ -1 +1,2 @@
-include(Compiler/GNU-CXX)
+include(Compiler/Clang)
+__compiler_clang(CXX)
diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake
new file mode 100644
index 0000000..f7be864
--- /dev/null
+++ b/Modules/Compiler/Clang.cmake
@@ -0,0 +1,25 @@
+
+#=============================================================================
+# Copyright 2002-2012 Kitware, Inc.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+# (To distribute this file outside of CMake, substitute the full
+#  License text for the above reference.)
+
+# This module is shared by multiple languages; use include blocker.
+if(__COMPILER_CLANG)
+  return()
+endif()
+set(__COMPILER_CLANG 1)
+
+include(Compiler/GNU)
+
+macro(__compiler_clang lang)
+  __compiler_gnu(${lang})
+endmacro()
-- 
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