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#############################################################################
# Copyright (c) 2023 Attila Szakacs
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
# As an additional exemption you are allowed to compile & link against the
# OpenSSL libraries as published by the OpenSSL project. See the file
# COPYING for details.
#
#############################################################################
include(CMakeParseArguments)
get_property(_protoc_path TARGET protobuf::protoc PROPERTY IMPORTED_LOCATION)
execute_process(COMMAND ${_protoc_path} --version OUTPUT_VARIABLE _protoc_version)
if("${_protoc_version}" MATCHES "libprotoc ([0-9.]+)")
set(_protoc_version "${CMAKE_MATCH_1}")
endif()
if("${_protoc_version}" VERSION_LESS "3.15.0")
set_property(GLOBAL PROPERTY PROTOC_EXTRA_FLAGS "--experimental_allow_proto3_optional")
endif()
function(_protobuf_generate_cpp_internal)
cmake_parse_arguments(_protobuf_generate_cpp_internal "" "PROTO_PATH;CPP_OUT;OUT_SRCS" "PROTOS;EXTRA_EXT;EXTRA_PROTOC_FLAGS;EXTRA_DEPENDS" "${ARGN}")
get_property(_protoc_extra_flags GLOBAL PROPERTY PROTOC_EXTRA_FLAGS)
file(MAKE_DIRECTORY ${_protobuf_generate_cpp_internal_CPP_OUT})
set(_generated_srcs_all)
foreach(_proto ${_protobuf_generate_cpp_internal_PROTOS})
get_filename_component(_abs_file ${_proto} ABSOLUTE)
get_filename_component(_abs_dir ${_abs_file} DIRECTORY)
get_filename_component(_basename ${_proto} NAME_WLE)
file(RELATIVE_PATH _rel_dir ${CMAKE_CURRENT_SOURCE_DIR} ${_abs_dir})
set(_generated_srcs)
foreach(_ext .pb.h .pb.cc ${_protobuf_generate_cpp_internal_EXTRA_EXT})
list(APPEND _generated_srcs "${_protobuf_generate_cpp_internal_CPP_OUT}/${_rel_dir}/${_basename}${_ext}")
endforeach()
add_custom_command(
OUTPUT ${_generated_srcs}
COMMAND protobuf::protoc
ARGS
${_protobuf_generate_cpp_internal_EXTRA_PROTOC_FLAGS}
--proto_path=${_protobuf_generate_cpp_internal_PROTO_PATH}
--cpp_out=${_protobuf_generate_cpp_internal_CPP_OUT}
${_protoc_extra_flags}
${_proto}
DEPENDS protobuf::protoc ${_protobuf_generate_cpp_internal_EXTRA_DEPENDS}
COMMENT "Running C++ protocol buffer compiler on ${_proto}"
VERBATIM)
set_source_files_properties(${_generated_srcs} PROPERTIES GENERATED TRUE)
list(APPEND _generated_srcs_all ${_generated_srcs})
endforeach()
set(${_protobuf_generate_cpp_internal_OUT_SRCS} ${_generated_srcs_all} PARENT_SCOPE)
endfunction()
function(protobuf_generate_cpp)
cmake_parse_arguments(protobuf_generate_cpp "" "PROTO_PATH;CPP_OUT;OUT_SRCS" "PROTOS" "${ARGN}")
_protobuf_generate_cpp_internal(
PROTO_PATH ${protobuf_generate_cpp_PROTO_PATH}
CPP_OUT ${protobuf_generate_cpp_CPP_OUT}
OUT_SRCS _out_srcs
PROTOS ${protobuf_generate_cpp_PROTOS})
set(${protobuf_generate_cpp_OUT_SRCS} ${_out_srcs} PARENT_SCOPE)
endfunction()
function(protobuf_generate_cpp_grpc)
cmake_parse_arguments(protobuf_generate_cpp_grpc "" "PROTO_PATH;CPP_OUT;OUT_SRCS" "PROTOS" "${ARGN}")
get_property(_grpc_cpp_plugin_path TARGET gRPC::grpc_cpp_plugin PROPERTY IMPORTED_LOCATION)
_protobuf_generate_cpp_internal(
PROTO_PATH ${protobuf_generate_cpp_grpc_PROTO_PATH}
CPP_OUT ${protobuf_generate_cpp_grpc_CPP_OUT}
OUT_SRCS _out_srcs
PROTOS ${protobuf_generate_cpp_grpc_PROTOS}
EXTRA_EXT .grpc.pb.cc .grpc.pb.h
EXTRA_PROTOC_FLAGS
--plugin=protoc-gen-grpc-cpp=${_grpc_cpp_plugin_path}
--grpc-cpp_out=${protobuf_generate_cpp_grpc_CPP_OUT}
EXTRA_DEPENDS gRPC::grpc_cpp_plugin)
set(${protobuf_generate_cpp_grpc_OUT_SRCS} ${_out_srcs} PARENT_SCOPE)
endfunction()
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