build: make the CTensorFlow module more SPM friendly (#1123)

Add the structure expected by SPM to enable building the CTensorFlow
module as part of a Swift Package.  It is no longer possible to build
this package without X10 support.

Author: compnerd

Sources/CTensorFlow/CMakeLists.txt

@@ -1,7 +1,7 @@
 add_library(CTensorFlow INTERFACE)
 if(NOT USE_BUNDLED_CTENSORFLOW)
   target_include_directories(CTensorFlow INTERFACE
-    ${CMAKE_CURRENT_SOURCE_DIR})
+    ${CMAKE_CURRENT_SOURCE_DIR}/include)
 endif()
 target_link_directories(CTensorFlow INTERFACE
   $<TARGET_FILE_DIR:x10>)
@@ -10,7 +10,7 @@ target_link_libraries(CTensorFlow INTERFACE
 
 list(GET X10_INCLUDE_DIRS 0 X10_SOURCE_DIR)
 
-install(FILES module.modulemap CTensorFlow.h
+install(FILES include/module.modulemap include/CTensorFlow.h
   DESTINATION lib/swift/tensorflow)
 install(DIRECTORY ${X10_SOURCE_DIR}/tensorflow/c
   DESTINATION lib/swift/tensorflow

Sources/CTensorFlow/CTensorFlow.c

@@ -0,0 +1,15 @@
+// Copyright 2020 TensorFlow Authors
+//
+// 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 "CTensorFlow.h"

Sources/CTensorFlow/CTensorFlow.h

@@ -0,0 +1,22 @@
+// Copyright 2020 TensorFlow Authors
+//
+// 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.
+
+#ifndef CTensorFlow_CTensorFlow_h
+#define CTensorFlow_CTensorFlow_h
+
+#include <tensorflow/c/c_api.h>
+#include <tensorflow/c/c_api_experimental.h>
+#include <tensorflow/c/eager/c_api.h>
+
+#endif