Add a CMakeLists.txt file for use by cmake, ctest

This enables out-of-tree builds, and the use of other build tools.

This will not overwrite Makefile if you are building in the
source tree.  To use makefiles generated from CMake, you must
build out of the source tree.

Usage: If SPIRV-Cross source is in $SPIRV_CROSS_ROOT, then to
build with ninja in a different directory:

   cmake -G Ninja $SPIRV_CROSS_ROOT
   ninja

   # Run tests, if enabled
   ctest

Tests will be enabled if you have python3.

.gitignore

@@ -11,3 +11,5 @@
 *.suo
 *.sdf
 *.opensdf
+
+!CMakeLists.txt

CMakeLists.txt

@@ -0,0 +1,65 @@
+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 2.8)
+project(SPIRV-Cross)
+enable_testing()
+
+if(${CMAKE_GENERATOR} MATCHES "Makefile")
+  if(${CMAKE_CURRENT_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_BINARY_DIR})
+    message(FATAL_ERROR "Build out of tree to avoid overwriting Makefile")
+  endif()
+endif()
+
+add_executable(spirv-cross
+	${CMAKE_CURRENT_SOURCE_DIR}/GLSL.std.450.h
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_common.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_cpp.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_cross.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_glsl.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv.hpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_msl.hpp
+
+	${CMAKE_CURRENT_SOURCE_DIR}/main.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_cpp.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_cross.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_glsl.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/spirv_msl.cpp
+	)
+
+# To specify special debug or optimization options, use
+# -DCMAKE_CXX_COMPILE_FLAGS
+# However, we require the C++11 dialect.
+if (NOT "${MSVC}")
+  target_compile_options(spirv-cross PRIVATE -std=c++11 -Wall -Wextra -Werror -Wshadow)
+endif(NOT "${MSVC}")
+
+
+# Set up tests, using only the simplest modes of the test_shaders
+# script.  You have to invoke the script manually to:
+#  - Update the reference files
+#  - Get cycle counts from malisc
+#  - Keep failing outputs
+find_program(PYTHON3_EXE python3)
+if(${PYTHON3_EXE} MATCHES "NOTFOUND")
+  message(WARNING "Testing disabled. Could not find python3")
+else()
+  add_test(NAME spirv-cross-opengl-test
+	   COMMAND ${PYTHON3_EXE} ${CMAKE_CURRENT_SOURCE_DIR}/test_shaders.py
+		   ${CMAKE_CURRENT_SOURCE_DIR}/shaders)
+  add_test(NAME spirv-cross-vulkan-test
+	   COMMAND ${PYTHON3_EXE} ${CMAKE_CURRENT_SOURCE_DIR}/test_shaders.py
+		   --vulkan
+		   ${CMAKE_CURRENT_SOURCE_DIR}/shaders-vulkan)
+endif()