Use ExternalProject_Add to build the examples in a stand-alone fashion.
diff --git a/cmake/examples.cmake b/cmake/examples.cmake
index f7d4d60..5a2538e 100644
--- a/cmake/examples.cmake
+++ b/cmake/examples.cmake
@@ -2,9 +2,56 @@
message(STATUS "Protocol Buffers Examples Configuring...")
endif()
-# Add examples subproject
-add_subdirectory(../examples examples)
+get_filename_component(examples_dir "../examples" ABSOLUTE)
if(protobuf_VERBOSE)
message(STATUS "Protocol Buffers Examples Configuring done")
endif()
+include(ExternalProject)
+
+# Internal utility function: Create a custom target representing a build of examples with custom options.
+function(add_examples_build NAME)
+ ExternalProject_Add(${NAME}
+ PREFIX ${NAME}
+ SOURCE_DIR "${examples_dir}"
+ BINARY_DIR ${NAME}
+ STAMP_DIR ${NAME}/logs
+ INSTALL_COMMAND "" #Skip
+ LOG_CONFIGURE 1
+ CMAKE_CACHE_ARGS "-Dprotobuf_MSVC_STATIC_RUNTIME:BOOL=${protobuf_MSVC_STATIC_RUNTIME}"
+ "-DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}"
+ "-Dprotobuf_VERBOSE:BOOL=${protobuf_VERBOSE}"
+ ${ARGN}
+ )
+ set_property(TARGET ${NAME} PROPERTY FOLDER "Examples")
+ set_property(TARGET ${NAME} PROPERTY EXCLUDE_FROM_ALL TRUE)
+endfunction()
+
+# Add examples as an external project.
+# sub_directory cannot be used because the find_package(protobuf) call would cause failures with redefined targets.
+add_examples_build(examples "-Dprotobuf_DIR:PATH=${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}")
+add_dependencies(examples libprotobuf protoc)
+
+option(protobuf_BUILD_EXAMPLES_MULTITEST "Build Examples in multiple configurations. Useful for testing." OFF)
+mark_as_advanced(protobuf_BUILD_EXAMPLES_MULTITEST)
+if(protobuf_BUILD_EXAMPLES_MULTITEST)
+ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
+
+ #Build using the legacy compatiblity module.
+ add_examples_build(examples-legacy
+ "-Dprotobuf_DIR:PATH=${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}"
+ "-Dprotobuf_MODULE_COMPATIBLE:BOOL=TRUE"
+ )
+ add_dependencies(examples-legacy libprotobuf protoc)
+
+ #Build using the installed library.
+ add_examples_build(examples-installed
+ "-Dprotobuf_DIR:PATH=${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_CMAKEDIR}"
+ )
+
+ #Build using the installed library in legacy compatiblity mode.
+ add_examples_build(examples-installed-legacy
+ "-Dprotobuf_DIR:PATH=${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_CMAKEDIR}"
+ "-Dprotobuf_MODULE_COMPATIBLE:BOOL=TRUE"
+ )
+endif()
diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index b4796f1..c9d4688 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -2,78 +2,62 @@
cmake_minimum_required(VERSION 2.8.12)
# Project
-project(addressbook)
+project(protobuf-examples)
# Find required protobuf package
-find_package(protobuf 3 CONFIG REQUIRED)
+find_package(protobuf CONFIG REQUIRED)
if(protobuf_VERBOSE)
message(STATUS "Using Protocol Buffers ${Protobuf_VERSION}")
endif()
-file(GLOB SRC_LIST "*.cc")
+set(CMAKE_INCLUDE_CURRENT_DIR TRUE)
-file(GLOB PROTO_LIST "*.proto")
-
-#
-# Code generation
-#
-
-if(protobuf_MODULE_COMPATIBLE) # Old school
-
- include_directories(${Protobuf_INCLUDE_DIRS})
- protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${PROTO_LIST})
-
-else() # New style
-
- set(PROTO_SRCS)
- set(PROTO_HDRS)
-
- foreach(FIL ${PROTO_LIST})
-
- get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
- get_filename_component(FIL_WE ${FIL} NAME_WE)
-
- list(APPEND PROTO_SRCS "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
- list(APPEND PROTO_HDRS "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
-
- add_custom_command(
- OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
- "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
- COMMAND protobuf::protoc
- ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} -I ${CMAKE_CURRENT_SOURCE_DIR}
- ${ABS_FIL}
- DEPENDS ${ABS_FIL}
- COMMENT "Running C++ protocol buffer compiler on ${FIL}"
- VERBATIM)
-
+# http://www.cmake.org/Wiki/CMake_FAQ#How_can_I_build_my_MSVC_application_with_a_static_runtime.3F
+if(MSVC AND protobuf_MSVC_STATIC_RUNTIME)
+ foreach(flag_var
+ CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_DEBUG CMAKE_CXX_FLAGS_RELEASE
+ CMAKE_CXX_FLAGS_MINSIZEREL CMAKE_CXX_FLAGS_RELWITHDEBINFO)
+ if(${flag_var} MATCHES "/MD")
+ string(REGEX REPLACE "/MD" "/MT" ${flag_var} "${${flag_var}}")
+ endif(${flag_var} MATCHES "/MD")
endforeach()
-
endif()
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
+foreach(example add_person list_people)
+ set(${example}_SRCS ${example}.cc)
+ set(${example}_PROTOS addressbook.proto)
-include(GNUInstallDirs)
+ #Code Generation
+ if(protobuf_MODULE_COMPATIBLE) #Legacy Support
+ protobuf_generate_cpp(${example}_PROTO_SRCS ${example}_PROTO_HDRS ${${example}_PROTOS})
+ list(APPEND ${example}_SRCS ${${example}_PROTO_SRCS} ${${example}_PROTO_HDRS})
+ else()
-foreach(FIL ${SRC_LIST})
+ foreach(proto_file ${${example}_PROTOS})
+ get_filename_component(proto_file_abs ${proto_file} ABSOLUTE)
+ get_filename_component(basename ${proto_file} NAME_WE)
+ set(generated_files ${basename}.pb.cc ${basename}.pb.h)
+ list(APPEND ${example}_SRCS ${generated_files})
- get_filename_component(FIL_NAME_WE ${FIL} NAME_WE)
-
- set(APP ${FIL_NAME_WE}_cpp)
-
- add_executable(${APP} ${FIL} ${PROTO_SRCS} ${PROTO_HDRS})
-
- #
- # Link libraries
- #
-
- if(protobuf_MODULE_COMPATIBLE) # Old school
- target_link_libraries(${APP} ${Protobuf_LIBRARIES})
- else() # New style
- target_link_libraries(${APP} protobuf::libprotobuf)
+ add_custom_command(
+ OUTPUT ${generated_files}
+ COMMAND protobuf::protoc
+ ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} -I ${CMAKE_CURRENT_SOURCE_DIR} ${proto_file_abs}
+ COMMENT "Generating ${generated_files} from ${proto_file}"
+ VERBATIM
+ )
+ endforeach()
endif()
- install(TARGETS ${APP}
- RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT ${APP})
+ #Executable setup
+ set(executable_name ${example}_cpp)
+ add_executable(${executable_name} ${${example}_SRCS} ${${example}_PROTOS})
+ if(protobuf_MODULE_COMPATIBLE) #Legacy mode
+ target_include_directories(${executable_name} PUBLIC ${PROTOBUF_INCLUDE_DIRS})
+ target_link_libraries(${executable_name} ${PROTOBUF_LIBRARIES})
+ else()
+ target_link_libraries(${executable_name} protobuf::libprotobuf)
+ endif()
endforeach()
