CMake/Modules/FindProtobuf.cmake

250 lines
7.7 KiB
CMake

#.rst:
# FindProtobuf
# ------------
#
# Locate and configure the Google Protocol Buffers library.
#
# The following variables can be set and are optional:
#
# ``PROTOBUF_SRC_ROOT_FOLDER``
# When compiling with MSVC, if this cache variable is set
# the protobuf-default VS project build locations
# (vsprojects/Debug & vsprojects/Release) will be searched
# for libraries and binaries.
# ``PROTOBUF_IMPORT_DIRS``
# List of additional directories to be searched for
# imported .proto files.
#
# Defines the following variables:
#
# ``PROTOBUF_FOUND``
# Found the Google Protocol Buffers library
# (libprotobuf & header files)
# ``PROTOBUF_INCLUDE_DIRS``
# Include directories for Google Protocol Buffers
# ``PROTOBUF_LIBRARIES``
# The protobuf libraries
# ``PROTOBUF_PROTOC_LIBRARIES``
# The protoc libraries
# ``PROTOBUF_LITE_LIBRARIES``
# The protobuf-lite libraries
#
# The following cache variables are also available to set or use:
#
# ``PROTOBUF_LIBRARY``
# The protobuf library
# ``PROTOBUF_PROTOC_LIBRARY``
# The protoc library
# ``PROTOBUF_INCLUDE_DIR``
# The include directory for protocol buffers
# ``PROTOBUF_PROTOC_EXECUTABLE``
# The protoc compiler
# ``PROTOBUF_LIBRARY_DEBUG``
# The protobuf library (debug)
# ``PROTOBUF_PROTOC_LIBRARY_DEBUG``
# The protoc library (debug)
# ``PROTOBUF_LITE_LIBRARY``
# The protobuf lite library
# ``PROTOBUF_LITE_LIBRARY_DEBUG``
# The protobuf lite library (debug)
#
# Example:
#
# .. code-block:: cmake
#
# find_package(Protobuf REQUIRED)
# include_directories(${PROTOBUF_INCLUDE_DIRS})
# include_directories(${CMAKE_CURRENT_BINARY_DIR})
# protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS foo.proto)
# add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
# target_link_libraries(bar ${PROTOBUF_LIBRARIES})
#
# .. note::
# The PROTOBUF_GENERATE_CPP macro and add_executable() or
# add_library() calls only work properly within the same
# directory.
#
# .. command:: protobuf_generate_cpp
#
# Add custom commands to process ``.proto`` files::
#
# protobuf_generate_cpp (<SRCS> <HDRS> [<ARGN>...])
#
# ``SRCS``
# Variable to define with autogenerated source files
# ``HDRS``
# Variable to define with autogenerated header files
# ``ARGN``
# ``.proto`` files
#=============================================================================
# Copyright 2009 Kitware, Inc.
# Copyright 2009-2011 Philip Lowman <philip@yhbt.com>
# Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
function(PROTOBUF_GENERATE_CPP SRCS HDRS)
if(NOT ARGN)
message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
return()
endif()
if(PROTOBUF_GENERATE_CPP_APPEND_PATH)
# Create an include path for each file specified
foreach(FIL ${ARGN})
get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
get_filename_component(ABS_PATH ${ABS_FIL} PATH)
list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
if(${_contains_already} EQUAL -1)
list(APPEND _protobuf_include_path -I ${ABS_PATH})
endif()
endforeach()
else()
set(_protobuf_include_path -I ${CMAKE_CURRENT_SOURCE_DIR})
endif()
if(DEFINED PROTOBUF_IMPORT_DIRS)
foreach(DIR ${PROTOBUF_IMPORT_DIRS})
get_filename_component(ABS_PATH ${DIR} ABSOLUTE)
list(FIND _protobuf_include_path ${ABS_PATH} _contains_already)
if(${_contains_already} EQUAL -1)
list(APPEND _protobuf_include_path -I ${ABS_PATH})
endif()
endforeach()
endif()
set(${SRCS})
set(${HDRS})
foreach(FIL ${ARGN})
get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
get_filename_component(FIL_WE ${FIL} NAME_WE)
list(APPEND ${SRCS} "${CMAKE_CURRENT_BINARY_DIR}/${FIL_WE}.pb.cc")
list(APPEND ${HDRS} "${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_EXECUTABLE}
ARGS --cpp_out ${CMAKE_CURRENT_BINARY_DIR} ${_protobuf_include_path} ${ABS_FIL}
DEPENDS ${ABS_FIL} ${PROTOBUF_PROTOC_EXECUTABLE}
COMMENT "Running C++ protocol buffer compiler on ${FIL}"
VERBATIM )
endforeach()
set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
set(${SRCS} ${${SRCS}} PARENT_SCOPE)
set(${HDRS} ${${HDRS}} PARENT_SCOPE)
endfunction()
# Internal function: search for normal library as well as a debug one
# if the debug one is specified also include debug/optimized keywords
# in *_LIBRARIES variable
function(_protobuf_find_libraries name filename)
find_library(${name}_LIBRARY
NAMES ${filename}
PATHS ${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Release)
mark_as_advanced(${name}_LIBRARY)
find_library(${name}_LIBRARY_DEBUG
NAMES ${filename}
PATHS ${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Debug)
mark_as_advanced(${name}_LIBRARY_DEBUG)
if(NOT ${name}_LIBRARY_DEBUG)
# There is no debug library
set(${name}_LIBRARY_DEBUG ${${name}_LIBRARY} PARENT_SCOPE)
set(${name}_LIBRARIES ${${name}_LIBRARY} PARENT_SCOPE)
else()
# There IS a debug library
set(${name}_LIBRARIES
optimized ${${name}_LIBRARY}
debug ${${name}_LIBRARY_DEBUG}
PARENT_SCOPE
)
endif()
endfunction()
# Internal function: find threads library
function(_protobuf_find_threads)
set(CMAKE_THREAD_PREFER_PTHREAD TRUE)
find_package(Threads)
if(Threads_FOUND)
list(APPEND PROTOBUF_LIBRARIES ${CMAKE_THREAD_LIBS_INIT})
set(PROTOBUF_LIBRARIES "${PROTOBUF_LIBRARIES}" PARENT_SCOPE)
endif()
endfunction()
#
# Main.
#
# By default have PROTOBUF_GENERATE_CPP macro pass -I to protoc
# for each directory where a proto file is referenced.
if(NOT DEFINED PROTOBUF_GENERATE_CPP_APPEND_PATH)
set(PROTOBUF_GENERATE_CPP_APPEND_PATH TRUE)
endif()
# Google's provided vcproj files generate libraries with a "lib"
# prefix on Windows
if(MSVC)
set(PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES "${CMAKE_FIND_LIBRARY_PREFIXES}")
set(CMAKE_FIND_LIBRARY_PREFIXES "lib" "")
find_path(PROTOBUF_SRC_ROOT_FOLDER protobuf.pc.in)
endif()
# The Protobuf library
_protobuf_find_libraries(PROTOBUF protobuf)
#DOC "The Google Protocol Buffers RELEASE Library"
_protobuf_find_libraries(PROTOBUF_LITE protobuf-lite)
# The Protobuf Protoc Library
_protobuf_find_libraries(PROTOBUF_PROTOC protoc)
# Restore original find library prefixes
if(MSVC)
set(CMAKE_FIND_LIBRARY_PREFIXES "${PROTOBUF_ORIG_FIND_LIBRARY_PREFIXES}")
endif()
if(UNIX)
_protobuf_find_threads()
endif()
# Find the include directory
find_path(PROTOBUF_INCLUDE_DIR
google/protobuf/service.h
PATHS ${PROTOBUF_SRC_ROOT_FOLDER}/src
)
mark_as_advanced(PROTOBUF_INCLUDE_DIR)
# Find the protoc Executable
find_program(PROTOBUF_PROTOC_EXECUTABLE
NAMES protoc
DOC "The Google Protocol Buffers Compiler"
PATHS
${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Release
${PROTOBUF_SRC_ROOT_FOLDER}/vsprojects/Debug
)
mark_as_advanced(PROTOBUF_PROTOC_EXECUTABLE)
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(PROTOBUF DEFAULT_MSG
PROTOBUF_LIBRARY PROTOBUF_INCLUDE_DIR)
if(PROTOBUF_FOUND)
set(PROTOBUF_INCLUDE_DIRS ${PROTOBUF_INCLUDE_DIR})
endif()