fix cmake warning when ON_INFER=false

test=develop

Author: luotao1

CMakeLists.txt

@@ -305,6 +305,6 @@ if(WITH_DOC)
 endif()
 
 if (ON_INFER)
-    message(WARNING "On inference mode, will take place some specific optimization.")
+    message(STATUS "On inference mode, will take place some specific optimization.")
     add_definitions(-DPADDLE_ON_INFERENCE)
 endif()

cmake/inference_lib.cmake

@@ -14,9 +14,6 @@
 
 # make package for paddle fluid shared and static library
 function(copy TARGET)
-    if (NOT ON_INFER)
-      message(WARNING "Turn on the ON_INFER flag when building inference_lib only.")
-    endif()
     set(options "")
     set(oneValueArgs "")
     set(multiValueArgs SRCS DSTS DEPS)

paddle/fluid/inference/api/demo_ci/run.sh

@@ -60,8 +60,7 @@ for WITH_STATIC_LIB in ON OFF; do
     -DWITH_MKL=$TURN_ON_MKL \
     -DDEMO_NAME=simple_on_word2vec \
     -DWITH_GPU=$TEST_GPU_CPU \
-    -DWITH_STATIC_LIB=$WITH_STATIC_LIB \
-    -DON_INFER=ON
+    -DWITH_STATIC_LIB=$WITH_STATIC_LIB
   make -j
   word2vec_model=${PADDLE_ROOT}'/build/python/paddle/fluid/tests/book/word2vec.inference.model'
   if [ -d $word2vec_model ]; then
@@ -81,8 +80,7 @@ for WITH_STATIC_LIB in ON OFF; do
     -DWITH_MKL=$TURN_ON_MKL \
     -DDEMO_NAME=vis_demo \
     -DWITH_GPU=$TEST_GPU_CPU \
-    -DWITH_STATIC_LIB=$WITH_STATIC_LIB \
-    -DON_INFER=ON
+    -DWITH_STATIC_LIB=$WITH_STATIC_LIB
   make -j
   for use_gpu in $use_gpu_list; do
     for vis_demo_name in $vis_demo_list; do
@@ -108,8 +106,7 @@ for WITH_STATIC_LIB in ON OFF; do
       -DWITH_STATIC_LIB=$WITH_STATIC_LIB \
       -DUSE_TENSORRT=$USE_TENSORRT \
       -DTENSORRT_INCLUDE_DIR=$TENSORRT_INCLUDE_DIR \
-      -DTENSORRT_LIB_DIR=$TENSORRT_LIB_DIR \
-      -DON_INFER=ON
+      -DTENSORRT_LIB_DIR=$TENSORRT_LIB_DIR
     make -j
     ./trt_mobilenet_demo \
       --modeldir=$DATA_DIR/mobilenet/model \