fix_cmake_command

doc/fluid/beginners_guide/install/compile/compile_CentOS.md

@@ -78,7 +78,7 @@
 
 	* 对于需要编译**CPU版本PaddlePaddle**的用户：
 
-		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF`
+		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release`
 
 	>> 我们目前不支持CentOS下GPU版本PaddlePaddle的编译
 
@@ -192,9 +192,9 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF		
+			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
 			For Python3: cmake .. -DPY_VERSION=3.5 -DPYTHON_INCLUDE_DIR=${PYTHON_INCLUDE_DIRS} \
-			-DPYTHON_LIBRARY=${PYTHON_LIBRARY} -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF
+			-DPYTHON_LIBRARY=${PYTHON_LIBRARY} -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
 
 
 		> 如果遇到`Could NOT find PROTOBUF (missing:  PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR)`可以重新执行一次cmake指令

doc/fluid/beginners_guide/install/compile/compile_MacOS.md

@@ -90,7 +90,7 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF`
+		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF  -DCMAKE_BUILD_TYPE=Release`
 
 		> 我们目前不支持CentOS下GPU版本PaddlePaddle的编译
 
@@ -195,9 +195,9 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF
+			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF  -DCMAKE_BUILD_TYPE=Release
 			For Python3: cmake .. -DPY_VERSION=3.5 -DPYTHON_INCLUDE_DIR=${PYTHON_INCLUDE_DIRS} \
-			 -DPYTHON_LIBRARY=${PYTHON_LIBRARY} -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF
+			 -DPYTHON_LIBRARY=${PYTHON_LIBRARY} -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF  -DCMAKE_BUILD_TYPE=Release
 
 
 10. 使用以下命令来编译：

doc/fluid/beginners_guide/install/compile/compile_Ubuntu.md

@@ -81,12 +81,12 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF`
+		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release`
 
 
 	* 对于需要编译**GPU版本PaddlePaddle**的用户：
 
-		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF`
+		`cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release`
 
 
 9. 执行编译：
@@ -182,8 +182,8 @@
 
 	*  对于需要编译**CPU版本PaddlePaddle**的用户：
 
-			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF
-			For Python3: cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF
+			For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
+			For Python3: cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=OFF -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
 
 
 	* 对于需要编译**GPU版本PaddlePaddle**的用户：(*仅支持ubuntu16.04/14.04*)
@@ -195,8 +195,8 @@
 
 		2. 如果您已经正确安装了`nccl2`，就可以开始cmake了：
 
-				For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF       
-				For Python3: cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF
+				For Python2: cmake .. -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
+				For Python3: cmake .. -DPY_VERSION=3.5 -DWITH_FLUID_ONLY=ON -DWITH_GPU=ON -DWITH_TESTING=OFF -DCMAKE_BUILD_TYPE=Release
 
 9. 使用以下命令来编译：