Added SNAPPY support in CMake scripts

tensorflow/contrib/cmake/CMakeLists.txt

@@ -33,6 +33,7 @@ option(tensorflow_BUILD_MORE_PYTHON_TESTS "Build more python unit tests for cont
 option(tensorflow_BUILD_SHARED_LIB "Build TensorFlow as a shared library" OFF)
 option(tensorflow_OPTIMIZE_FOR_NATIVE_ARCH "Enable compiler optimizations for the native processor architecture (if available)" ON)
 option(tensorflow_WIN_CPU_SIMD_OPTIONS "Enables CPU SIMD instructions")
+option(tensorflow_ENABLE_SNAPPY_SUPPORT "Enable SNAPPY compression support" OFF)
 
 if (NOT WIN32)
   # Threads: defines CMAKE_THREAD_LIBS_INIT and adds -pthread compile option
@@ -204,6 +205,16 @@ if(tensorflow_ENABLE_JEMALLOC_SUPPORT)
   list(APPEND tensorflow_EXTERNAL_DEPENDENCIES jemalloc)
   include_directories(${jemalloc_INCLUDE_DIRS})
 endif()
+if(tensorflow_ENABLE_SNAPPY_SUPPORT)
+  if (WIN32)
+    include(snappy)
+    list(APPEND tensorflow_EXTERNAL_LIBRARIES ${snappy_STATIC_LIBRARIES})
+    list(APPEND tensorflow_EXTERNAL_DEPENDENCIES snappy)
+    include_directories(${snappy_INCLUDE_DIR})
+  else()
+    message(FATAL_ERROR "CMake build with SNAPPY is only supported on Windows at the moment")
+  endif()
+endif()
 if(WIN32)
   list(APPEND tensorflow_EXTERNAL_LIBRARIES wsock32 ws2_32 shlwapi)
 endif()

tensorflow/contrib/cmake/external/snappy.cmake

@@ -0,0 +1,47 @@
+# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+#
+# 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.
+# ==============================================================================
+include (ExternalProject)
+
+set(snappy_URL https://github.com/google/snappy.git)
+set(snappy_TAG "1.1.6")
+set(snappy_BUILD ${CMAKE_CURRENT_BINARY_DIR}/snappy/src/snappy)
+set(snappy_INCLUDE_DIR ${CMAKE_CURRENT_BINARY_DIR}/snappy/src/snappy)
+
+if(WIN32)
+    set(snappy_STATIC_LIBRARIES ${snappy_BUILD}/$(Configuration)/snappy.lib)
+endif()
+
+set(snappy_HEADERS
+    "${snappy_INCLUDE_DIR}/snappy.h"
+)
+
+ExternalProject_Add(snappy
+    PREFIX snappy
+    GIT_REPOSITORY ${snappy_URL}
+    GIT_TAG ${snappy_TAG}
+    DOWNLOAD_DIR "${DOWNLOAD_LOCATION}"
+    BUILD_IN_SOURCE 1
+    INSTALL_COMMAND ""
+    LOG_DOWNLOAD ON
+    LOG_CONFIGURE ON
+    LOG_BUILD ON
+    CMAKE_CACHE_ARGS
+        -DCMAKE_BUILD_TYPE:STRING=Release
+        -DCMAKE_VERBOSE_MAKEFILE:BOOL=OFF
+    -DCMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON
+)
+
+# actually enables snappy in the source code
+add_definitions(-DSNAPPY)