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      1 if(protobuf_VERBOSE)
      2   message(STATUS "Protocol Buffers Examples Configuring...")
      3 endif()
      4 
      5 get_filename_component(examples_dir "../examples" ABSOLUTE)
      6 
      7 if(protobuf_VERBOSE)
      8   message(STATUS "Protocol Buffers Examples Configuring done")
      9 endif()
     10 include(ExternalProject)
     11 
     12 # Internal utility function: Create a custom target representing a build of examples with custom options.
     13 function(add_examples_build NAME)
     14 
     15   ExternalProject_Add(${NAME}
     16     PREFIX ${NAME}
     17     SOURCE_DIR "${examples_dir}"
     18     BINARY_DIR ${NAME}
     19     STAMP_DIR ${NAME}/logs
     20     INSTALL_COMMAND "" #Skip
     21     LOG_CONFIGURE 1
     22     CMAKE_CACHE_ARGS "-DCMAKE_BUILD_TYPE:STRING=${CMAKE_BUILD_TYPE}"
     23                      "-Dprotobuf_VERBOSE:BOOL=${protobuf_VERBOSE}"
     24                      ${ARGN}
     25   )
     26   set_property(TARGET ${NAME} PROPERTY FOLDER "Examples")
     27   set_property(TARGET ${NAME} PROPERTY EXCLUDE_FROM_ALL TRUE)
     28 endfunction()
     29 
     30 # Add examples as an external project.
     31 # sub_directory cannot be used because the find_package(protobuf) call would cause failures with redefined targets.
     32 add_examples_build(examples "-Dprotobuf_DIR:PATH=${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}")
     33 add_dependencies(examples libprotobuf protoc)
     34 
     35 option(protobuf_BUILD_EXAMPLES_MULTITEST "Build Examples in multiple configurations. Useful for testing." OFF)
     36 mark_as_advanced(protobuf_BUILD_EXAMPLES_MULTITEST)
     37 if(protobuf_BUILD_EXAMPLES_MULTITEST)
     38   set_property(GLOBAL PROPERTY USE_FOLDERS ON)
     39 
     40   #Build using the legacy compatibility module.
     41   add_examples_build(examples-legacy
     42     "-Dprotobuf_DIR:PATH=${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_CMAKEDIR}"
     43     "-Dprotobuf_MODULE_COMPATIBLE:BOOL=TRUE"
     44   )
     45   add_dependencies(examples-legacy libprotobuf protoc)
     46 
     47   #Build using the installed library.
     48   add_examples_build(examples-installed
     49     "-Dprotobuf_DIR:PATH=${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_CMAKEDIR}"
     50   )
     51 
     52   #Build using the installed library in legacy compatibility mode.
     53   add_examples_build(examples-installed-legacy
     54     "-Dprotobuf_DIR:PATH=${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_CMAKEDIR}"
     55     "-Dprotobuf_MODULE_COMPATIBLE:BOOL=TRUE"
     56   )
     57 endif()
     58