add go_xxx to simplify cmake

CMakeLists.txt

@@ -19,7 +19,7 @@ set(PROJ_ROOT ${CMAKE_CURRENT_SOURCE_DIR})
 
 include(system)
 
-project(paddle CXX C)
+project(paddle CXX C Go)
 
 find_package(Sphinx)
 if(NOT CMAKE_CROSSCOMPILING)
@@ -92,6 +92,7 @@ include(external/swig)      # download, build, install swig
 include(external/warpctc)   # download, build, install warpctc
 include(external/any)       # download libn::any
 
+include(generic)            # simplify cmake module
 include(package)            # set paddle packages
 include(cpplint)            # set paddle c++ style
 include(ccache)             # set ccache for compilation

cmake/generic.cmake

@@ -0,0 +1,97 @@
+# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+# 
+# 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.
+
+
+# To simplify the build process of PaddlePaddle, we defined couple of
+# fundamental abstractions, e.g., how to build library, binary and
+# test in C++, CUDA and Go.
+# 
+# -------------------------------------------
+#    C++	      CUDA C++	      Go
+# -------------------------------------------
+# cc_library	 nv_library	  go_library
+# cc_binary  	 nv_binary	  go_binary
+# cc_test        nv_test	  go_test
+# -------------------------------------------
+#
+# cmake_parse_arguments can help us to achieve this goal.
+# https://cmake.org/cmake/help/v3.0/module/CMakeParseArguments.html
+
+
+set(GOPATH "${CMAKE_CURRENT_BINARY_DIR}/go")
+file(MAKE_DIRECTORY ${GOPATH})
+
+# Because api.go defines a GO wrapper to ops and tensor, it depends on
+# both.  This implies that if any of tensor.{h,cc}, ops.{h,cu}, or
+# api.go is changed, api need to be re-built.
+# go_library(api
+#   SRCS
+#   api.go
+#   DEPS
+#   tensor # Because ops depend on tensor, this line is optional.
+#   ops)
+function(go_library TARGET_NAME)
+  set(options OPTIONAL)
+  set(oneValueArgs "")
+  set(multiValueArgs SRCS DEPS)
+  cmake_parse_arguments(go_library "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+  if (${go_library_OPTIONAL} STREQUAL "SHARED")
+    set(BUILD_MODE "-buildmode=c-shared")
+    if(APPLE)
+      set(LIB_NAME "lib${TARGET_NAME}.dylib")
+    else()
+      set(LIB_NAME "lib${TARGET_NAME}.so")
+    endif()  
+  else()
+    set(BUILD_MODE "-buildmode=c-archive")
+    set(LIB_NAME "lib${TARGET_NAME}.a")
+  endif()
+  add_custom_command(OUTPUT ${TARGET_NAME}_timestamp
+    COMMAND env GOPATH=${GOPATH} ${CMAKE_Go_COMPILER} build ${BUILD_MODE}
+    -o "${CMAKE_CURRENT_BINARY_DIR}/${LIB_NAME}"
+    ${go_library_SRCS}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})
+  add_custom_target(${TARGET_NAME}_lib ALL DEPENDS ${TARGET_NAME}_timestamp ${go_library_DEPS})
+  add_library(${TARGET_NAME} STATIC IMPORTED)
+  set_target_properties(${TARGET_NAME} PROPERTIES
+    IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/${LIB_NAME})
+endfunction(go_library)
+
+function(go_binary TARGET_NAME)
+  set(options OPTIONAL)
+  set(oneValueArgs "")
+  set(multiValueArgs SRCS DEPS)
+  cmake_parse_arguments(go_binary "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+  add_custom_command(OUTPUT ${TARGET_NAME}_timestamp
+    COMMAND env GOPATH=${GOPATH} ${CMAKE_Go_COMPILER} build
+    -o "${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}"
+    ${go_library_SRCS}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})  
+  add_custom_target(${TARGET_NAME} ALL DEPENDS ${TARGET_NAME}_timestamp ${go_binary_DEPS})  
+  install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} DESTINATION bin)
+endfunction(go_binary)
+
+function(go_test TARGET_NAME)
+  set(options OPTIONAL)
+  set(oneValueArgs "")
+  set(multiValueArgs SRCS DEPS)
+  cmake_parse_arguments(go_test "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+  add_custom_command(OUTPUT ${TARGET_NAME}_timestamp
+    COMMAND env GOPATH=${GOPATH} ${CMAKE_Go_COMPILER} test
+    -c -o "${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME}"
+    ${go_test_SRCS}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_LIST_DIR})  
+  add_custom_target(${TARGET_NAME} ALL DEPENDS ${TARGET_NAME}_timestamp ${go_test_DEPS})  
+  add_test(${TARGET_NAME} ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME})
+endfunction(go_test)