Add WITH_C_API option

CMakeLists.txt

@@ -43,6 +43,7 @@ option(WITH_DOC         "Compile PaddlePaddle with documentation"       OFF)
 option(ON_COVERALLS     "Compile PaddlePaddle with code coverage"       OFF)
 option(COVERALLS_UPLOAD "Package code coverage data to coveralls"       OFF)
 option(ON_TRAVIS        "Exclude special unit test on Travis CI"        OFF)
+option(WITH_C_API       "Compile PaddlePaddle with C-API(Prediction)"   ON)
 
 # CMAKE_BUILD_TYPE
 if(NOT CMAKE_BUILD_TYPE)
@@ -53,6 +54,7 @@ endif()
 
 set(THIRD_PARTY_PATH "${PROJ_ROOT}/third_party" CACHE STRING
   "A path setting third party libraries download & build directories.")
+
 ########################################################################################
 
 include(external/zlib)      # download, build, install zlib

paddle/CMakeLists.txt

@@ -8,7 +8,9 @@ add_subdirectory(gserver)
 add_subdirectory(pserver)
 add_subdirectory(trainer)
 add_subdirectory(scripts)
-add_subdirectory(capi)
+if(WITH_C_API)
+    add_subdirectory(capi)
+endif()
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/setup.py.in
     ${CMAKE_CURRENT_SOURCE_DIR}/setup.py)