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FindProtobuf.cmake
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
#=============================================================================
# This file is heavily modified/rewritten from FindProtobuf.cmake from the
# CMake project:
#
# Copyright 2011 Kirill A. Korinskiy <catap@catap.ru>
# Copyright 2009 Kitware, Inc.
# Copyright 2009 Philip Lowman <philip@yhbt.com>
# Copyright 2008 Esben Mose Hansen, Ange Optimization ApS
#
# Distributed under the OSI-approved BSD License (the "License"):
#
# CMake - Cross Platform Makefile Generator
# Copyright 2000-2015 Kitware, Inc.
# Copyright 2000-2011 Insight Software Consortium
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the names of Kitware, Inc., the Insight Software Consortium,
# nor the names of their contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#=============================================================================
#########
# Local rewrite of the protobuf support in cmake.
#
# Supports cross-module protobuf dependencies and protobufs inside
# packages much better than the one built into cmake.
#########
#
# Locate and configure the Google Protocol Buffers library.
# Defines the following variables:
#
# PROTOBUF_INCLUDE_DIR - the include directory for protocol buffers
# PROTOBUF_SHARED_LIBRARY - path to protobuf's shared library
# PROTOBUF_STATIC_LIBRARY - path to protobuf's static library
# PROTOBUF_PROTOC_SHARED_LIBRARY - path to protoc's shared library
# PROTOBUF_PROTOC_STATIC_LIBRARY - path to protoc's static library
# PROTOBUF_PROTOC_EXECUTABLE - the protoc compiler
# PROTOBUF_FOUND - whether the Protocol Buffers library has been found
#
# ====================================================================
# Example:
#
# find_package(Protobuf REQUIRED)
# include_directories(${PROTOBUF_INCLUDE_DIR})
#
# include_directories(${CMAKE_CURRENT_BINARY_DIR})
# PROTOBUF_GENERATE_CPP(PROTO_SRCS PROTO_HDRS PROTO_TGTS
# [SOURCE_ROOT <root from which source is found>]
# [BINARY_ROOT <root into which binaries are built>]
# PROTO_FILES foo.proto)
# add_executable(bar bar.cc ${PROTO_SRCS} ${PROTO_HDRS})
# target_link_libraries(bar ${PROTOBUF_SHARED_LIBRARY})
#
# NOTE: You may need to link against pthreads, depending
# on the platform.
# ====================================================================
#
# PROTOBUF_GENERATE_CPP (public function)
# SRCS = Variable to define with autogenerated
# source files
# HDRS = Variable to define with autogenerated
# header files
# TGTS = Variable to define with autogenerated
# custom targets; if SRCS/HDRS need to be used in multiple
# libraries, those libraries should depend on these targets
# in order to "serialize" the protoc invocations
# ====================================================================
function(PROTOBUF_GENERATE_CPP SRCS HDRS TGTS)
if(NOT ARGN)
message(SEND_ERROR "Error: PROTOBUF_GENERATE_CPP() called without any proto files")
return()
endif(NOT ARGN)
set(options)
set(one_value_args SOURCE_ROOT BINARY_ROOT)
set(multi_value_args EXTRA_PROTO_PATHS PROTO_FILES)
cmake_parse_arguments(ARG "${options}" "${one_value_args}" "${multi_value_args}" ${ARGN})
if(ARG_UNPARSED_ARGUMENTS)
message(SEND_ERROR "Error: unrecognized arguments: ${ARG_UNPARSED_ARGUMENTS}")
endif()
set(${SRCS})
set(${HDRS})
set(${TGTS})
set(EXTRA_PROTO_PATH_ARGS)
foreach(PP ${ARG_EXTRA_PROTO_PATHS})
set(EXTRA_PROTO_PATH_ARGS ${EXTRA_PROTO_PATH_ARGS} --proto_path ${PP})
endforeach()
if("${ARG_SOURCE_ROOT}" STREQUAL "")
SET(ARG_SOURCE_ROOT "${CMAKE_CURRENT_SOURCE_DIR}")
endif()
GET_FILENAME_COMPONENT(ARG_SOURCE_ROOT ${ARG_SOURCE_ROOT} ABSOLUTE)
if("${ARG_BINARY_ROOT}" STREQUAL "")
SET(ARG_BINARY_ROOT "${CMAKE_CURRENT_BINARY_DIR}")
endif()
GET_FILENAME_COMPONENT(ARG_BINARY_ROOT ${ARG_BINARY_ROOT} ABSOLUTE)
GET_FILENAME_COMPONENT(PROTO_LIB_DIR ${PROTOBUF_SHARED_LIBRARY} DIRECTORY)
foreach(FIL ${ARG_PROTO_FILES})
get_filename_component(ABS_FIL ${FIL} ABSOLUTE)
get_filename_component(FIL_WE ${FIL} NAME_WE)
# Ensure that the protobuf file is within the source root.
# This is a requirement of protoc.
FILE(RELATIVE_PATH PROTO_REL_TO_ROOT "${ARG_SOURCE_ROOT}" "${ABS_FIL}")
GET_FILENAME_COMPONENT(REL_DIR "${PROTO_REL_TO_ROOT}" PATH)
if(NOT REL_DIR STREQUAL "")
SET(REL_DIR "${REL_DIR}/")
endif()
set(PROTO_CC_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.cc")
set(PROTO_H_OUT "${ARG_BINARY_ROOT}/${REL_DIR}${FIL_WE}.pb.h")
list(APPEND ${SRCS} "${PROTO_CC_OUT}")
list(APPEND ${HDRS} "${PROTO_H_OUT}")
add_custom_command(
OUTPUT "${PROTO_CC_OUT}" "${PROTO_H_OUT}"
COMMAND ${CMAKE_COMMAND}
-E env "LD_LIBRARY_PATH=${PROTO_LIB_DIR}:$ENV{LD_LIBRARY_PATH}"
${PROTOBUF_PROTOC_EXECUTABLE}
ARGS
--plugin $<TARGET_FILE:protoc-gen-insertions>
--cpp_out ${ARG_BINARY_ROOT}
--insertions_out ${ARG_BINARY_ROOT}
--proto_path ${ARG_SOURCE_ROOT}
# Used to find built-in .proto files (e.g. FileDescriptorProto)
--proto_path ${PROTOBUF_INCLUDE_DIR}
${EXTRA_PROTO_PATH_ARGS} ${ABS_FIL}
DEPENDS ${ABS_FIL} protoc-gen-insertions
COMMENT "Running C++ protocol buffer compiler on ${FIL}"
VERBATIM )
# This custom target enforces that there's just one invocation of protoc
# when there are multiple consumers of the generated files. The target name
# must be unique; adding parts of the filename helps ensure this.
set(TGT_NAME PROTO_${REL_DIR}${FIL})
string(REPLACE "/" "-" TGT_NAME ${TGT_NAME})
add_custom_target(${TGT_NAME}
DEPENDS "${PROTO_CC_OUT}" "${PROTO_H_OUT}")
list(APPEND ${TGTS} "${TGT_NAME}")
endforeach()
set_source_files_properties(${${SRCS}} ${${HDRS}} PROPERTIES GENERATED TRUE)
set(${SRCS} ${${SRCS}} PARENT_SCOPE)
set(${HDRS} ${${HDRS}} PARENT_SCOPE)
set(${TGTS} ${${TGTS}} PARENT_SCOPE)
endfunction()
find_path(PROTOBUF_INCLUDE_DIR google/protobuf/service.h
PATHS ${PROTOBUF_ROOT}/include
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
find_library(PROTOBUF_SHARED_LIBRARY protobuf
PATHS ${PROTOBUF_ROOT}/lib
DOC "The Google Protocol Buffers Library"
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
find_library(PROTOBUF_STATIC_LIBRARY libprotobuf.a
PATHS ${PROTOBUF_ROOT}/lib
DOC "Static version of the Google Protocol Buffers Library"
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
find_library(PROTOBUF_PROTOC_SHARED_LIBRARY protoc
PATHS ${PROTOBUF_ROOT}/lib
DOC "The Google Protocol Buffers Compiler Library"
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
find_library(PROTOBUF_PROTOC_STATIC_LIBRARY libprotoc.a
PATHS ${PROTOBUF_ROOT}/lib
DOC "Static version of the Google Protocol Buffers Compiler Library"
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
find_program(PROTOBUF_PROTOC_EXECUTABLE protoc
PATHS ${PROTOBUF_ROOT}/bin
DOC "The Google Protocol Buffers Compiler"
NO_CMAKE_SYSTEM_PATH
NO_SYSTEM_ENVIRONMENT_PATH)
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(PROTOBUF REQUIRED_VARS
PROTOBUF_SHARED_LIBRARY PROTOBUF_STATIC_LIBRARY
PROTOBUF_PROTOC_SHARED_LIBRARY PROTOBUF_PROTOC_STATIC_LIBRARY
PROTOBUF_INCLUDE_DIR PROTOBUF_PROTOC_EXECUTABLE)