2016-09-27 22:01:08 +03:00
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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2013-10-15 19:17:36 +04:00
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#.rst:
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# FindProtobuf
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# ------------
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#
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2009-09-21 04:12:39 +04:00
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# Locate and configure the Google Protocol Buffers library.
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2011-05-26 06:01:49 +04:00
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#
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# The following variables can be set and are optional:
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#
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_SRC_ROOT_FOLDER``
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2014-11-06 21:49:32 +03:00
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# When compiling with MSVC, if this cache variable is set
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# the protobuf-default VS project build locations
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2015-07-08 03:18:38 +03:00
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# (vsprojects/Debug and vsprojects/Release
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# or vsprojects/x64/Debug and vsprojects/x64/Release)
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# will be searched for libraries and binaries.
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_IMPORT_DIRS``
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2014-11-06 21:49:32 +03:00
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# List of additional directories to be searched for
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# imported .proto files.
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_DEBUG``
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2016-02-12 10:23:44 +03:00
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# Show debug messages.
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2011-12-19 03:02:48 +04:00
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#
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2009-09-21 04:12:39 +04:00
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# Defines the following variables:
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#
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_FOUND``
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2014-11-06 21:49:32 +03:00
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# Found the Google Protocol Buffers library
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# (libprotobuf & header files)
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_VERSION``
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2016-02-12 10:23:44 +03:00
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# Version of package found.
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_INCLUDE_DIRS``
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2014-11-06 21:49:32 +03:00
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# Include directories for Google Protocol Buffers
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LIBRARIES``
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2014-11-06 21:49:32 +03:00
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# The protobuf libraries
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_PROTOC_LIBRARIES``
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2014-11-06 21:49:32 +03:00
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# The protoc libraries
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LITE_LIBRARIES``
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2014-11-06 21:49:32 +03:00
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# The protobuf-lite libraries
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2009-09-21 04:12:39 +04:00
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#
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2011-05-26 06:01:49 +04:00
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# The following cache variables are also available to set or use:
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2013-10-15 19:17:36 +04:00
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#
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LIBRARY``
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2014-11-06 21:49:32 +03:00
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# The protobuf library
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_PROTOC_LIBRARY``
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2014-11-06 21:49:32 +03:00
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# The protoc library
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_INCLUDE_DIR``
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2014-11-06 21:49:32 +03:00
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# The include directory for protocol buffers
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_PROTOC_EXECUTABLE``
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2014-11-06 21:49:32 +03:00
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# The protoc compiler
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LIBRARY_DEBUG``
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2014-11-06 21:49:32 +03:00
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# The protobuf library (debug)
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_PROTOC_LIBRARY_DEBUG``
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2014-11-06 21:49:32 +03:00
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# The protoc library (debug)
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LITE_LIBRARY``
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2014-11-06 21:49:32 +03:00
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# The protobuf lite library
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2016-03-01 11:15:19 +03:00
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# ``Protobuf_LITE_LIBRARY_DEBUG``
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2014-11-06 21:49:32 +03:00
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# The protobuf lite library (debug)
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#
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# Example:
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#
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# .. code-block:: cmake
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#
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# find_package(Protobuf REQUIRED)
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2016-03-01 11:15:19 +03:00
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# include_directories(${Protobuf_INCLUDE_DIRS})
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2014-11-06 21:49:32 +03:00
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# include_directories(${CMAKE_CURRENT_BINARY_DIR})
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# protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS foo.proto)
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2015-09-14 10:41:38 +03:00
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# protobuf_generate_python(PROTO_PY foo.proto)
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2014-11-06 21:49:32 +03:00
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# add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
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2016-03-01 11:15:19 +03:00
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# target_link_libraries(bar ${Protobuf_LIBRARIES})
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2014-11-06 21:49:32 +03:00
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#
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# .. note::
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2015-09-14 10:41:38 +03:00
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# The ``protobuf_generate_cpp`` and ``protobuf_generate_python``
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# functions and :command:`add_executable` or :command:`add_library`
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# calls only work properly within the same directory.
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2014-11-06 21:49:32 +03:00
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#
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# .. command:: protobuf_generate_cpp
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#
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2015-09-14 10:41:38 +03:00
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# Add custom commands to process ``.proto`` files to C++::
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2014-11-06 21:49:32 +03:00
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#
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# protobuf_generate_cpp (<SRCS> <HDRS> [<ARGN>...])
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#
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# ``SRCS``
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# Variable to define with autogenerated source files
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# ``HDRS``
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# Variable to define with autogenerated header files
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# ``ARGN``
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# ``.proto`` files
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2015-09-14 10:41:38 +03:00
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#
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# .. command:: protobuf_generate_python
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#
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# Add custom commands to process ``.proto`` files to Python::
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#
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# protobuf_generate_python (<PY> [<ARGN>...])
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#
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# ``PY``
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# Variable to define with autogenerated Python files
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# ``ARGN``
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# ``.proto`` filess
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2009-09-28 19:45:50 +04:00
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2009-09-21 04:12:39 +04:00
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function(PROTOBUF_GENERATE_CPP SRCS HDRS)
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if(NOT ARGN)
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message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
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return()
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2012-08-13 21:50:14 +04:00
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endif()
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2009-09-21 04:12:39 +04:00
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2011-06-07 09:07:41 +04:00
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if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
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# Create an include path for each file specified
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(ABS_PATH ${ABS_FIL} PATH)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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else()
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set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
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endif()
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2016-07-30 06:10:04 +03:00
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if(DEFINED PROTOBUF_IMPORT_DIRS AND NOT DEFINED Protobuf_IMPORT_DIRS)
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set(Protobuf_IMPORT_DIRS "${PROTOBUF_IMPORT_DIRS}")
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endif()
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2016-03-01 11:15:19 +03:00
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if(DEFINED Protobuf_IMPORT_DIRS)
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foreach(DIR ${Protobuf_IMPORT_DIRS})
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2011-12-19 03:02:48 +04:00
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get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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endif()
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2009-09-21 04:12:39 +04:00
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set(${SRCS})
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set(${HDRS})
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(FIL_WE ${FIL} NAME_WE)
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2016-10-07 16:37:55 +03:00
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if(NOT PROTOBUF_GENERATE_CPP_APPEND_PATH)
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get_filename_component(FIL_DIR ${FIL} DIRECTORY)
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if(FIL_DIR)
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set(FIL_WE "${FIL_DIR}/${FIL_WE}")
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endif()
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2016-06-09 16:53:17 +03:00
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endif()
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2012-08-13 21:42:58 +04:00
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2009-09-21 04:12:39 +04:00
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list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
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list(APPEND ${HDRS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h")
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add_custom_command(
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OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc"
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"${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.h"
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2016-03-01 11:15:19 +03:00
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COMMAND ${Protobuf_PROTOC_EXECUTABLE}
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2011-06-07 09:07:41 +04:00
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ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
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2016-03-01 11:15:19 +03:00
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DEPENDS ${ABS_FIL} ${Protobuf_PROTOC_EXECUTABLE}
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2009-09-21 04:12:39 +04:00
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COMMENT "Running C++ protocol buffer compiler on ${FIL}"
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VERBATIM )
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endforeach()
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set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
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set(${SRCS} ${${SRCS}} PARENT_SCOPE)
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set(${HDRS} ${${HDRS}} PARENT_SCOPE)
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endfunction()
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2015-09-14 10:41:38 +03:00
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function(PROTOBUF_GENERATE_PYTHON SRCS)
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if(NOT ARGN)
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message(SEND_ERROR "Error: PROTOBUF_GENERATE_PYTHON() called without any proto files")
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return()
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endif()
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if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
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# Create an include path for each file specified
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(ABS_PATH ${ABS_FIL} PATH)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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else()
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set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
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endif()
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2016-07-30 06:10:04 +03:00
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if(DEFINED PROTOBUF_IMPORT_DIRS AND NOT DEFINED Protobuf_IMPORT_DIRS)
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set(Protobuf_IMPORT_DIRS "${PROTOBUF_IMPORT_DIRS}")
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endif()
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2016-03-01 11:15:19 +03:00
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if(DEFINED Protobuf_IMPORT_DIRS)
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foreach(DIR ${Protobuf_IMPORT_DIRS})
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2015-09-14 10:41:38 +03:00
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get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
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list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
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if(${_contains_already} EQUAL -1)
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list(APPEND _protobuf_include_path -I ${ABS_PATH})
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endif()
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endforeach()
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endif()
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set(${SRCS})
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foreach(FIL ${ARGN})
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get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
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get_filename_component(FIL_WE ${FIL} NAME_WE)
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2016-10-07 16:37:55 +03:00
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if(NOT PROTOBUF_GENERATE_CPP_APPEND_PATH)
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get_filename_component(FIL_DIR ${FIL} DIRECTORY)
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if(FIL_DIR)
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set(FIL_WE "${FIL_DIR}/${FIL_WE}")
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endif()
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2016-06-09 16:53:17 +03:00
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endif()
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2015-09-14 10:41:38 +03:00
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list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}_pb2.py")
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add_custom_command(
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OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}_pb2.py"
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2016-03-01 11:15:19 +03:00
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COMMAND ${Protobuf_PROTOC_EXECUTABLE} --python_out ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
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DEPENDS ${ABS_FIL} ${Protobuf_PROTOC_EXECUTABLE}
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2015-09-14 10:41:38 +03:00
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COMMENT "Running Python protocol buffer compiler on ${FIL}"
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VERBATIM )
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endforeach()
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set(${SRCS} ${${SRCS}} PARENT_SCOPE)
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endfunction()
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2016-03-01 11:15:19 +03:00
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# Backwards compatibility
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# Define camel case versions of input variables
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foreach(UPPER
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PROTOBUF_SRC_ROOT_FOLDER
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PROTOBUF_IMPORT_DIRS
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PROTOBUF_DEBUG
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PROTOBUF_LIBRARY
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PROTOBUF_PROTOC_LIBRARY
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PROTOBUF_INCLUDE_DIR
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PROTOBUF_PROTOC_EXECUTABLE
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PROTOBUF_LIBRARY_DEBUG
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PROTOBUF_PROTOC_LIBRARY_DEBUG
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PROTOBUF_LITE_LIBRARY
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PROTOBUF_LITE_LIBRARY_DEBUG
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)
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if (DEFINED ${UPPER})
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string(REPLACE "PROTOBUF_" "Protobuf_" Camel ${UPPER})
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if (NOT DEFINED ${Camel})
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set(${Camel} ${${UPPER}})
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endif()
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endif()
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endforeach()
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2015-07-08 03:18:38 +03:00
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if(CMAKE_SIZEOF_VOID_P EQUAL 8)
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set(_PROTOBUF_ARCH_DIR x64/)
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endif()
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2016-02-11 11:24:27 +03:00
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include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
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2011-05-26 06:01:49 +04:00
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# Internal function: search for normal library as well as a debug one
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# if the debug one is specified also include debug/optimized keywords
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# in *_LIBRARIES variable
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function(_protobuf_find_libraries name filename)
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2016-02-11 11:24:27 +03:00
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if(${name}_LIBRARIES)
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# Use result recorded by a previous call.
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return()
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elseif(${name}_LIBRARY)
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# Honor cache entry used by CMake 3.5 and lower.
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set(${name}_LIBRARIES "${${name}_LIBRARY}" PARENT_SCOPE)
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else()
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find_library(${name}_LIBRARY_RELEASE
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NAMES ${filename}
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2016-03-01 11:15:19 +03:00
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PATHS ${Protobuf_SRC_ROOT_FOLDER}/vsprojects/${_PROTOBUF_ARCH_DIR}Release)
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2016-02-11 11:24:27 +03:00
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mark_as_advanced(${name}_LIBRARY_RELEASE)
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find_library(${name}_LIBRARY_DEBUG
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NAMES ${filename}
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2016-03-01 11:15:19 +03:00
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PATHS ${Protobuf_SRC_ROOT_FOLDER}/vsprojects/${_PROTOBUF_ARCH_DIR}Debug)
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2016-02-11 11:24:27 +03:00
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mark_as_advanced(${name}_LIBRARY_DEBUG)
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select_library_configurations(${name})
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set(${name}_LIBRARY "${${name}_LIBRARY}" PARENT_SCOPE)
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set(${name}_LIBRARIES "${${name}_LIBRARIES}" PARENT_SCOPE)
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endif()
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2011-05-26 06:01:49 +04:00
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endfunction()
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2013-05-09 00:04:30 +04:00
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# Internal function: find threads library
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function(_protobuf_find_threads)
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set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
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find_package(Threads)
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if(Threads_FOUND)
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2016-03-01 11:15:19 +03:00
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list(APPEND Protobuf_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
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set(Protobuf_LIBRARIES "${Protobuf_LIBRARIES}" PARENT_SCOPE)
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2013-05-09 00:04:30 +04:00
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endif()
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endfunction()
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2011-05-26 06:01:49 +04:00
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#
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# Main.
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#
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2009-09-21 04:12:39 +04:00
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2011-06-07 09:07:41 +04:00
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# By default have PROTOBUF_GENERATE_CPP macro pass -I to protoc
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# for each directory where a proto file is referenced.
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if(NOT DEFINED PROTOBUF_GENERATE_CPP_APPEND_PATH)
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set(PROTOBUF_GENERATE_CPP_APPEND_PATH TRUE)
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endif()
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2009-09-21 04:12:39 +04:00
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# Google's provided vcproj files generate libraries with a "lib"
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# prefix on Windows
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2011-05-26 06:01:49 +04:00
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if(MSVC)
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2016-03-01 11:15:19 +03:00
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set(Protobuf_ORIG_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
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2009-09-21 04:12:39 +04:00
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set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
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2011-05-26 06:01:49 +04:00
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2016-03-01 11:15:19 +03:00
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find_path(Protobuf_SRC_ROOT_FOLDER protobuf.pc.in)
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2009-09-21 04:12:39 +04:00
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endif()
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2011-05-26 06:01:49 +04:00
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# The Protobuf library
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2016-03-01 11:15:19 +03:00
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_protobuf_find_libraries(Protobuf protobuf)
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2011-05-26 06:01:49 +04:00
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#DOC "The Google Protocol Buffers RELEASE Library"
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2009-09-21 04:12:39 +04:00
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2016-03-01 11:15:19 +03:00
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_protobuf_find_libraries(Protobuf_LITE protobuf-lite)
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2011-05-26 06:01:49 +04:00
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# The Protobuf Protoc Library
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2016-03-01 11:15:19 +03:00
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_protobuf_find_libraries(Protobuf_PROTOC protoc)
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2009-09-21 05:15:33 +04:00
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2009-09-21 04:12:39 +04:00
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# Restore original find library prefixes
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2011-05-26 06:01:49 +04:00
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if(MSVC)
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2016-03-01 11:15:19 +03:00
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set(CMAKE_FIND_LIBRARY_PREFIXES "${Protobuf_ORIG_FIND_LIBRARY_PREFIXES}")
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2009-09-21 04:12:39 +04:00
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endif()
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2013-05-09 00:04:30 +04:00
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if(UNIX)
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_protobuf_find_threads()
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endif()
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2011-05-26 06:01:49 +04:00
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# Find the include directory
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2016-03-01 11:15:19 +03:00
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find_path(Protobuf_INCLUDE_DIR
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2011-05-26 06:01:49 +04:00
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google/protobuf/service.h
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2016-03-01 11:15:19 +03:00
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PATHS ${Protobuf_SRC_ROOT_FOLDER}/src
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2011-05-26 06:01:49 +04:00
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)
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2016-03-01 11:15:19 +03:00
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mark_as_advanced(Protobuf_INCLUDE_DIR)
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2011-05-26 06:01:49 +04:00
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# Find the protoc Executable
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2016-03-01 11:15:19 +03:00
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find_program(Protobuf_PROTOC_EXECUTABLE
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2011-05-26 06:01:49 +04:00
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NAMES protoc
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DOC "The Google Protocol Buffers Compiler"
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PATHS
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2016-03-01 11:15:19 +03:00
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${Protobuf_SRC_ROOT_FOLDER}/vsprojects/${_PROTOBUF_ARCH_DIR}Release
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${Protobuf_SRC_ROOT_FOLDER}/vsprojects/${_PROTOBUF_ARCH_DIR}Debug
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2011-05-26 06:01:49 +04:00
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)
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2016-03-01 11:15:19 +03:00
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mark_as_advanced(Protobuf_PROTOC_EXECUTABLE)
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2011-05-26 06:01:49 +04:00
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2016-03-01 11:15:19 +03:00
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if(Protobuf_DEBUG)
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2016-02-12 10:23:44 +03:00
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message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
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"requested version of Google Protobuf is ${Protobuf_FIND_VERSION}")
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endif()
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2016-03-01 11:15:19 +03:00
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if(Protobuf_INCLUDE_DIR)
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set(_PROTOBUF_COMMON_HEADER ${Protobuf_INCLUDE_DIR}/google/protobuf/stubs/common.h)
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2016-02-12 10:23:44 +03:00
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2016-03-01 11:15:19 +03:00
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if(Protobuf_DEBUG)
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2016-02-12 10:23:44 +03:00
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message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
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"location of common.h: ${_PROTOBUF_COMMON_HEADER}")
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endif()
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2016-03-01 11:15:19 +03:00
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set(Protobuf_VERSION "")
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set(Protobuf_LIB_VERSION "")
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2016-02-12 10:23:44 +03:00
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file(STRINGS ${_PROTOBUF_COMMON_HEADER} _PROTOBUF_COMMON_H_CONTENTS REGEX "#define[ \t]+GOOGLE_PROTOBUF_VERSION[ \t]+")
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if(_PROTOBUF_COMMON_H_CONTENTS MATCHES "#define[ \t]+GOOGLE_PROTOBUF_VERSION[ \t]+([0-9]+)")
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2016-03-01 11:15:19 +03:00
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set(Protobuf_LIB_VERSION "${CMAKE_MATCH_1}")
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2016-02-12 10:23:44 +03:00
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endif()
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unset(_PROTOBUF_COMMON_H_CONTENTS)
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2016-03-01 11:15:19 +03:00
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math(EXPR _PROTOBUF_MAJOR_VERSION "${Protobuf_LIB_VERSION} / 1000000")
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math(EXPR _PROTOBUF_MINOR_VERSION "${Protobuf_LIB_VERSION} / 1000 % 1000")
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math(EXPR _PROTOBUF_SUBMINOR_VERSION "${Protobuf_LIB_VERSION} % 1000")
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set(Protobuf_VERSION "${_PROTOBUF_MAJOR_VERSION}.${_PROTOBUF_MINOR_VERSION}.${_PROTOBUF_SUBMINOR_VERSION}")
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2016-02-12 10:23:44 +03:00
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2016-03-01 11:15:19 +03:00
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if(Protobuf_DEBUG)
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2016-02-12 10:23:44 +03:00
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message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
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2016-03-01 11:15:19 +03:00
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"${_PROTOBUF_COMMON_HEADER} reveals protobuf ${Protobuf_VERSION}")
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2016-02-12 10:23:44 +03:00
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endif()
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# Check Protobuf compiler version to be aligned with libraries version
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2016-03-01 11:15:19 +03:00
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execute_process(COMMAND ${Protobuf_PROTOC_EXECUTABLE} --version
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2016-02-12 10:23:44 +03:00
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OUTPUT_VARIABLE _PROTOBUF_PROTOC_EXECUTABLE_VERSION)
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if("${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}" MATCHES "libprotoc ([0-9.]+)")
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set(_PROTOBUF_PROTOC_EXECUTABLE_VERSION "${CMAKE_MATCH_1}")
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endif()
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2016-03-01 11:15:19 +03:00
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if(Protobuf_DEBUG)
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2016-02-12 10:23:44 +03:00
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message(STATUS "[ ${CMAKE_CURRENT_LIST_FILE}:${CMAKE_CURRENT_LIST_LINE} ] "
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2016-03-01 11:15:19 +03:00
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"${Protobuf_PROTOC_EXECUTABLE} reveals version ${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}")
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2016-02-12 10:23:44 +03:00
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endif()
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2016-03-01 11:15:19 +03:00
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if(NOT "${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}" VERSION_EQUAL "${Protobuf_VERSION}")
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2016-02-12 10:23:44 +03:00
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message(WARNING "Protobuf compiler version ${_PROTOBUF_PROTOC_EXECUTABLE_VERSION}"
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2016-03-01 11:15:19 +03:00
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" doesn't match library version ${Protobuf_VERSION}")
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2016-02-12 10:23:44 +03:00
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endif()
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endif()
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2011-05-26 06:01:49 +04:00
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Modules: Include builtin FindPackageHandleStandardArgs directly
The FindPackageHandleStandardArgs module was originally created outside
of CMake. It was added for CMake 2.6.0 by commit e118a627 (add a macro
FIND_PACKAGE_HANDLE_STANDARD_ARGS..., 2007-07-18). However, it also
proliferated into a number of other projects that at the time required
only CMake 2.4 and thus could not depend on CMake to provide the module.
CMake's own find modules started using the module in commit b5f656e0
(use the new FIND_PACKAGE_HANDLE_STANDARD_ARGS in some of the FindXXX
modules..., 2007-07-18).
Then commit d358cf5c (add 2nd, more powerful mode to
find_package_handle_standard_args, 2010-07-29) added a new feature to
the interface of the module that was fully optional and backward
compatible with all existing users of the module. Later commit 5f183caa
(FindZLIB: use the FPHSA version mode, 2010-08-04) and others shortly
thereafter started using the new interface in CMake's own find modules.
This change was also backward compatible because it was only an
implementation detail within each module.
Unforutnately these changes introduced a problem for projects that still
have an old copy of FindPackageHandleStandardArgs in CMAKE_MODULE_PATH.
When any such project uses one of CMake's builtin find modules the line
include(FindPackageHandleStandardArgs)
loads the copy from the project which does not have the new interface!
Then the including find module tries to use the new interface with the
old module and fails.
Whether this breakage can be considered a backward incompatible change
in CMake is debatable. The situation is analagous to copying a standard
library header from one version of a compiler into a project and then
observing problems when the next version of the compiler reports errors
in its other headers that depend on its new version of the original
header. Nevertheless it is a change to CMake that causes problems for
projects that worked with previous versions.
This problem was discovered during the 2.8.3 release candidate cycle.
It is an instance of a more general problem with projects that provide
their own versions of CMake modules when other CMake modules depend on
them. At the time we resolved this instance of the problem with commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28) for the 2.8.3 release.
In order to address the more general problem we introduced policy
CMP0017 in commit db44848f (Prefer files from CMAKE_ROOT when including
from CMAKE_ROOT, 2010-11-17). That change was followed by commit
ce28737c (Remove usage of CMAKE_CURRENT_LIST_DIR now that we have
CMP0017, 2010-12-20) which reverted the original workaround in favor of
using the policy. However, existing project releases do not set the
policy behavior to NEW and therefore still exhibit the problem.
We introduced in commit a364daf1 (Allow users to specify defaults for
unset policies, 2011-01-03) an option for users to build existing
projects by adding -DCMAKE_POLICY_DEFAULT_CMP0017=NEW to the command
line. Unfortunately this solution still does not allow such projects to
build out of the box, and there is no good way to suggest the use of the
new option.
The only remaining solution to keep existing projects that exhibit this
problem building is to restore the change originally made in commit
b0118402 (Use absolute path to FindPackageHandleStandardArgs.cmake
everywhere, 2010-09-28). This also avoids policy CMP0017 warnings for
this particular instance of the problem the policy addresses.
2011-01-20 18:56:49 +03:00
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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2016-02-12 10:23:44 +03:00
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FIND_PACKAGE_HANDLE_STANDARD_ARGS(Protobuf
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2016-03-01 11:15:19 +03:00
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REQUIRED_VARS Protobuf_LIBRARIES Protobuf_INCLUDE_DIR
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VERSION_VAR Protobuf_VERSION
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2016-02-12 10:23:44 +03:00
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)
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2009-09-21 04:12:39 +04:00
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2016-03-01 11:15:19 +03:00
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if(Protobuf_FOUND)
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set(Protobuf_INCLUDE_DIRS ${Protobuf_INCLUDE_DIR})
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2009-09-21 04:12:39 +04:00
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endif()
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2016-03-01 11:15:19 +03:00
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# Backwards compatibility
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# Define upper case versions of output variables
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foreach(Camel
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Protobuf_SRC_ROOT_FOLDER
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Protobuf_IMPORT_DIRS
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Protobuf_DEBUG
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Protobuf_INCLUDE_DIRS
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Protobuf_LIBRARIES
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Protobuf_PROTOC_LIBRARIES
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Protobuf_LITE_LIBRARIES
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Protobuf_LIBRARY
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Protobuf_PROTOC_LIBRARY
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Protobuf_INCLUDE_DIR
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Protobuf_PROTOC_EXECUTABLE
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Protobuf_LIBRARY_DEBUG
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Protobuf_PROTOC_LIBRARY_DEBUG
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Protobuf_LITE_LIBRARY
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Protobuf_LITE_LIBRARY_DEBUG
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)
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string(TOUPPER ${Camel} UPPER)
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set(${UPPER} ${${Camel}})
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endforeach()
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