libprotobuf is a separate 3rdparty lib now

modules/dnn/3rdparty/protobuf/CMakeLists.txt

@@ -1,3 +1,5 @@
+project(libprotobuf)
+
 include(CheckIncludeFiles)
 include(cmake/CheckCxxHashset.cmake)
 include(cmake/CheckCxxHashmap.cmake)
@@ -89,13 +91,13 @@ endif()
 
 add_definitions( -D_GNU_SOURCE=1 )
 add_definitions( -DHAVE_CONFIG_H )
-configure_file("cmake/libporobuf_config.h.in" "config.h")
+configure_file("cmake/config.h.in" "config.h")
 
 if(MSVC)
   add_definitions( -D_CRT_SECURE_NO_WARNINGS=1 )
   ocv_warnings_disable(CMAKE_CXX_FLAGS /wd4244 /wd4267 /wd4018 /wd4355 /wd4800 /wd4251 /wd4996 /wd4146 /wd4305)
 else()
-  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-deprecated -Wunused-parameter -Wunused-local-typedefs -Wsign-compare -Wundef)
+  ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-deprecated -Wshadow -Wmissing-declarations -Wunused-parameter -Wunused-local-typedefs -Wsign-compare -Wsign-promo -Wundef)
 endif()
 
 # Easier to support different versions of protobufs
@@ -105,15 +107,15 @@ function(append_if_exist OUTPUT_LIST)
         if(EXISTS ${fil})
             list(APPEND ${OUTPUT_LIST} "${fil}")
         else()
-            message("Warning: file missing: ${fil}")
+            message(WARNING "file missing: ${fil}")
         endif()
     endforeach()
     set(${OUTPUT_LIST} ${${OUTPUT_LIST}} PARENT_SCOPE)
 endfunction()
 
-set(PROTOBUF_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/protobuf)
+set(PROTOBUF_ROOT ${CMAKE_CURRENT_SOURCE_DIR})
 
-append_if_exist(PROTO_SRCS
+append_if_exist(PROTOBUF_SRCS
   ${PROTOBUF_ROOT}/src/google/protobuf/compiler/importer.cc
   ${PROTOBUF_ROOT}/src/google/protobuf/compiler/parser.cc
   ${PROTOBUF_ROOT}/src/google/protobuf/descriptor.cc
@@ -150,3 +152,25 @@ append_if_exist(PROTO_SRCS
   ${PROTOBUF_ROOT}/src/google/protobuf/wire_format_lite.cc
 #  ${PROTOBUF_ROOT}/src/google/protobuf/stubs/hash.cc
 )
+
+if(UNIX AND (CMAKE_COMPILER_IS_GNUCXX OR CV_ICC))
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+endif()
+
+add_library(libprotobuf STATIC ${PROTOBUF_SRCS})
+include_directories(${PROTOBUF_ROOT}/src ${CMAKE_CURRENT_BINARY_DIR})
+
+set_target_properties(libprotobuf
+    PROPERTIES
+    OUTPUT_NAME libprotobuf
+    DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
+    ARCHIVE_OUTPUT_DIRECTORY ${3P_LIBRARY_OUTPUT_PATH}
+    )
+
+if(ENABLE_SOLUTION_FOLDERS)
+  set_target_properties(libprotobuf PROPERTIES FOLDER "3rdparty")
+endif()
+
+#if(NOT BUILD_SHARED_LIBS)
+#  ocv_install_target(libprotobuf EXPORT OpenCVModules ARCHIVE DESTINATION ${OPENCV_3P_LIB_INSTALL_PATH} COMPONENT dev)
+#endif()

modules/dnn/3rdparty/protobuf/cmake/.gitignore

@@ -0,0 +1,2 @@
+build
+build-*

modules/dnn/3rdparty/protobuf/cmake/CheckCxxHashmap.cmake

@@ -53,4 +53,3 @@ macro(CHECK_HASHMAP)
   endif(NOT HAVE_GNU_EXT_HASH_MAP)
 
 endmacro(CHECK_HASHMAP)
-

modules/dnn/CMakeLists.txt

@@ -5,13 +5,13 @@ if(${CMAKE_PROJECT_NAME} STREQUAL "OpenCV")#build as OpenCV module
 set(the_description "Deep neural network module. It allows to load models and to make forward pass")
 set(OPENCV_MODULE_IS_PART_OF_WORLD OFF)
 
-OCV_OPTION(BUILD_LIBPROTOBUF_FROM_SOURCES "Build libprotobuf from sources or try to find it in system" OFF)
+OCV_OPTION(BUILD_LIBPROTOBUF_FROM_SOURCES "Force to build libprotobuf from sources (don't try to find it in system)" OFF)
 include(cmake/find_protobuf.cmake)
 
 ocv_add_module(dnn opencv_imgproc opencv_core opencv_highgui WRAP python matlab)
 ocv_warnings_disable(CMAKE_CXX_FLAGS -Wno-shadow -Wno-parentheses -Wmaybe-uninitialized -Wsign-promo -Wmissing-declarations -Wmissing-prototypes)
-ocv_glob_module_sources(${PROTO_SRCS} ${PROTO_HDRS})
-ocv_source_group("Src\\protobuf" FILES ${PROTO_SRCS} ${PROTO_HDRS})
+ocv_glob_module_sources(${PROTOBUF_SRCS} ${PROTOBUF_HDRS})
+ocv_source_group("Src\\protobuf" FILES ${PROTOBUF_SRCS} ${PROTOBUF_HDRS})
 ocv_module_include_directories(include ${PROTOBUF_INCLUDE_DIR})
 
 ocv_create_module(${PROTOBUF_LIBRARIES})

modules/dnn/cmake/find_protobuf.cmake

@@ -5,7 +5,7 @@ endif()
 if(NOT BUILD_LIBPROTOBUF_FROM_SOURCES AND PROTOBUF_FOUND AND EXISTS ${PROTOBUF_PROTOC_EXECUTABLE})
   message(STATUS "The protocol buffer compiler and libprotobuf were found")
 
-  PROTOBUF_GENERATE_CPP(PROTO_HDRS PROTO_SRCS src/caffe/caffe.proto)
+  PROTOBUF_GENERATE_CPP(PROTOBUF_HDRS PROTOBUF_SRCS src/caffe/caffe.proto)
   add_definitions(-DHAVE_PROTOBUF=1)
 else()
   if(NOT PROTOBUF_FOUND)
@@ -14,12 +14,23 @@ else()
     message(STATUS "The protocol buffer compiler not found")
   endif()
 
-  include(cmake/libprotobuf.cmake)
-  set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+  if(NOT OPENCV_INITIAL_PASS)
+  add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/protobuf)
+  endif()
+
+  add_custom_command(
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/caffe.pb.cc
+           ${CMAKE_CURRENT_BINARY_DIR}/caffe.pb.h
+    COMMAND ${CMAKE_COMMAND} -E tar xzf ${CMAKE_CURRENT_SOURCE_DIR}/src/caffe/compiled/caffe.tar.gz
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    COMMENT "Unpacking compiled caffe protobuf files"
+    VERBATIM
+  )
 
-  set(PROTOBUF_INCLUDE_DIR ${PROTOBUF_ROOT}/src  ${CMAKE_CURRENT_SOURCE_DIR}/src/caffe/compiled)
-  list(APPEND PROTO_SRCS ${CMAKE_CURRENT_SOURCE_DIR}/src/caffe/compiled/caffe.pb.cc)
-  set(PROTOBUF_LIBRARIES "")
+  set(PROTOBUF_LIBRARIES libprotobuf)
+  set(PROTOBUF_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/3rdparty/protobuf/src ${CMAKE_CURRENT_BINARY_DIR})
+  set(PROTOBUF_SRCS ${CMAKE_CURRENT_BINARY_DIR}/caffe.pb.cc)
+  set(PROTOBUF_HDRS ${CMAKE_CURRENT_BINARY_DIR}/caffe.pb.h)
   set(PROTOBUF_PROTOC_EXECUTABLE "")
   add_definitions(-DHAVE_PROTOBUF=1)
 endif()