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#===============================================================================
# Copyright (C) 2017 Open Source Robotics Foundation
#
# Licensed 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.
#
########################################
# Find Protobuf
# This is an ignition wrapper for finding Protobuf. The purpose of this find
# module is to search for a config-file for Protobuf before resorting to using
# the native CMake find-module for Protobuf. This ensures that if a specially
# configured version of Protobuf is installed, then its exported targets will be
# correctly imported. This is especially important on Windows in order to
# support shared library versions of Protobuf.
include(IgnPkgConfig)
ign_pkg_config_entry(IgnProtobuf "protobuf >= ${IgnProtobuf_FIND_VERSION}")
find_package(Protobuf ${IgnProtobuf_FIND_VERSION} QUIET CONFIG)
if(NOT ${Protobuf_FOUND})
# If a config-file was not found, then fall back on the system-installed
# find-module that comes with CMake.
find_package(Protobuf ${IgnProtobuf_FIND_VERSION})
endif()
set(IgnProtobuf_missing_components "")
foreach(component ${IgnProtobuf_FIND_COMPONENTS})
# If specific components are requested, check that each one is accounted for.
# If any component is missing, then we should not consider this package to be
# found.
# If a requested component is not required, then we can just skip this
# iteration. We don't do anything special for optional components.
if(NOT IgnProtobuf_FIND_REQUIRED_${component})
continue()
endif()
if((${component} STREQUAL "libprotobuf") OR (${component} STREQUAL "all"))
if((NOT PROTOBUF_LIBRARY) AND (NOT TARGET protobuf::libprotobuf))
set(Protobuf_FOUND false)
ign_string_append(IgnProtobuf_missing_components "libprotobuf" DELIM " ")
endif()
endif()
if((${component} STREQUAL "libprotoc") OR (${component} STREQUAL "all"))
if((NOT PROTOBUF_PROTOC_LIBRARY) AND (NOT TARGET protobuf::libprotoc))
set(Protobuf_FOUND false)
ign_string_append(IgnProtobuf_missing_components "libprotoc" DELIM " ")
endif()
endif()
if((${component} STREQUAL "protoc") OR (${component} STREQUAL "all"))
if((NOT PROTOBUF_PROTOC_EXECUTABLE) AND (NOT TARGET protobuf::protoc))
set(Protobuf_FOUND false)
ign_string_append(IgnProtobuf_missing_components "protoc" DELIM " ")
endif()
endif()
endforeach()
if(IgnProtobuf_missing_components AND NOT IgnProtobuf_FIND_QUIETLY)
message(STATUS "Missing required protobuf components: ${IgnProtobuf_missing_components}")
endif()
if(${Protobuf_FOUND})
# If we have found Protobuf, then set the IgnProtobuf_FOUND flag to true so
# that ign_find_package(~) knows that we were successful.
set(IgnProtobuf_FOUND true)
# Older versions of protobuf don't create imported targets, so we will create
# them here if they have not been provided.
include(IgnImportTarget)
if(NOT TARGET protobuf::libprotobuf)
ign_import_target(protobuf
TARGET_NAME protobuf::libprotobuf
LIB_VAR PROTOBUF_LIBRARY
INCLUDE_VAR PROTOBUF_INCLUDE_DIR)
endif()
if(NOT TARGET protobuf::libprotoc)
ign_import_target(protobuf
TARGET_NAME protobuf::libprotoc
LIB_VAR PROTOBUF_PROTOC_LIBRARY
INCLUDE_VAR PROTOBUF_INCLUDE_DIR)
endif()
if(NOT TARGET protobuf::protoc)
add_executable(protobuf::protoc IMPORTED)
set_target_properties(protobuf::protoc PROPERTIES
IMPORTED_LOCATION ${PROTOBUF_PROTOC_EXECUTABLE})
endif()
endif()
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