271 lines
11 KiB
CMake
271 lines
11 KiB
CMake
# ~~~
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# Copyright 2019 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ~~~
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# Introduce a new TARGET property to associate proto files with a target.
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#
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# We use a function to define the property so it can be called multiple times
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# without introducing the property over and over.
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function (google_cloud_cpp_add_protos_property)
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set_property(
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TARGET
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PROPERTY PROTO_SOURCES BRIEF_DOCS
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"The list of .proto files for a target." FULL_DOCS
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"List of .proto files specified for a target.")
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endfunction ()
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# Generate C++ for .proto files preserving the directory hierarchy
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#
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# Receives a list of `.proto` file names and (a) creates the runs to convert
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# these files to `.pb.h` and `.pb.cc` output files, (b) returns the list of
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# `.pb.cc` files and `.pb.h` files in @p HDRS, and (c) creates the list of files
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# preserving the directory hierarchy, such that if a `.proto` file says:
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#
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# import "foo/bar/baz.proto"
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#
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# the resulting C++ code says:
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#
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# #include <foo/bar/baz.pb.h>
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#
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# Use the `PROTO_PATH` option to provide one or more directories to search for
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# proto files in the import.
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#
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# @par Example
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#
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# google_cloud_cpp_generate_proto( MY_PB_FILES "foo/bar/baz.proto"
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# "foo/bar/qux.proto" PROTO_PATH_DIRECTORIES "another/dir/with/protos")
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#
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# Note that `protoc` the protocol buffer compiler requires your protos to be
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# somewhere in the search path defined by the `--proto_path` (aka -I) options.
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# For example, if you want to generate the `.pb.{h,cc}` files for
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# `foo/bar/baz.proto` then the directory containing `foo` must be in the search
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# path.
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function (google_cloud_cpp_generate_proto SRCS)
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cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
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if (NOT _opt_UNPARSED_ARGUMENTS)
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message(SEND_ERROR "Error: google_cloud_cpp_generate_proto() called"
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" without any proto files")
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return()
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endif ()
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# Build the list of `--proto_path` options. Use the absolute path for each
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# option given, and do not include any path more than once.
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set(protobuf_include_path)
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foreach (dir ${_opt_PROTO_PATH_DIRECTORIES})
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get_filename_component(absolute_path ${dir} ABSOLUTE)
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list(FIND protobuf_include_path "${absolute_path}"
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already_in_search_path)
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if (${already_in_search_path} EQUAL -1)
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list(APPEND protobuf_include_path "--proto_path" "${absolute_path}")
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endif ()
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endforeach ()
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set(${SRCS})
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foreach (filename ${_opt_UNPARSED_ARGUMENTS})
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get_filename_component(file_directory "${filename}" DIRECTORY)
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# This gets the filename without the extension, analogous to $(basename
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# "${filename}" .proto)
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get_filename_component(file_stem "${filename}" NAME_WE)
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# Strip all the prefixes in ${_opt_PROTO_PATH_DIRECTORIES} from the
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# source proto directory
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set(D "${file_directory}")
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if (DEFINED _opt_PROTO_PATH_DIRECTORIES)
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foreach (P ${_opt_PROTO_PATH_DIRECTORIES})
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string(REGEX REPLACE "^${P}" "" T "${D}")
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set(D ${T})
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endforeach ()
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endif ()
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set(pb_cc "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.pb.cc")
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set(pb_h "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.pb.h")
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list(APPEND ${SRCS} "${pb_cc}" "${pb_h}")
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add_custom_command(
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OUTPUT "${pb_cc}" "${pb_h}"
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COMMAND
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$<TARGET_FILE:protobuf::protoc> ARGS --cpp_out
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"${CMAKE_CURRENT_BINARY_DIR}" ${protobuf_include_path}
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"${filename}"
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DEPENDS "${filename}" protobuf::protoc
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COMMENT "Running C++ protocol buffer compiler on ${filename}"
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VERBATIM)
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endforeach ()
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set_source_files_properties(${${SRCS}} PROPERTIES GENERATED TRUE)
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set(${SRCS}
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${${SRCS}}
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PARENT_SCOPE)
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endfunction ()
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# Generate gRPC C++ files from .proto files preserving the directory hierarchy.
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#
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# Receives a list of `.proto` file names and (a) creates the runs to convert
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# these files to `.grpc.pb.h` and `.grpc.pb.cc` output files, (b) returns the
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# list of `.grpc.pb.cc` and `.pb.h` files in @p SRCS, and (c) creates the list
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# of files preserving the directory hierarchy, such that if a `.proto` file says
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#
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# import "foo/bar/baz.proto"
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#
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# the resulting C++ code says:
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#
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# #include <foo/bar/baz.pb.h>
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#
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# Use the `PROTO_PATH` option to provide one or more directories to search for
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# proto files in the import.
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#
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# @par Example
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#
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# google_cloud_cpp_generate_grpc( MY_GRPC_PB_FILES "foo/bar/baz.proto"
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# "foo/bar/qux.proto" PROTO_PATH_DIRECTORIES "another/dir/with/protos")
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#
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# Note that `protoc` the protocol buffer compiler requires your protos to be
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# somewhere in the search path defined by the `--proto_path` (aka -I) options.
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# For example, if you want to generate the `.pb.{h,cc}` files for
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# `foo/bar/baz.proto` then the directory containing `foo` must be in the search
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# path.
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function (google_cloud_cpp_generate_grpcpp SRCS)
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cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
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if (NOT _opt_UNPARSED_ARGUMENTS)
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message(
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SEND_ERROR "Error: google_cloud_cpp_generate_grpc() called without"
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" any proto files")
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return()
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endif ()
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# Build the list of `--proto_path` options. Use the absolute path for each
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# option given, and do not include any path more than once.
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set(protobuf_include_path)
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foreach (dir ${_opt_PROTO_PATH_DIRECTORIES})
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get_filename_component(absolute_path ${dir} ABSOLUTE)
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list(FIND protobuf_include_path "${absolute_path}"
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already_in_search_path)
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if (${already_in_search_path} EQUAL -1)
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list(APPEND protobuf_include_path "--proto_path" "${absolute_path}")
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endif ()
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endforeach ()
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set(${SRCS})
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foreach (filename ${_opt_UNPARSED_ARGUMENTS})
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get_filename_component(file_directory "${filename}" DIRECTORY)
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# This gets the filename without the extension, analogous to $(basename
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# "${filename}" .proto)
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get_filename_component(file_stem "${filename}" NAME_WE)
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# Strip all the prefixes in ${_opt_PROTO_PATH_DIRECTORIES} from the
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# source proto directory
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set(D "${file_directory}")
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if (DEFINED _opt_PROTO_PATH_DIRECTORIES)
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foreach (P ${_opt_PROTO_PATH_DIRECTORIES})
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string(REGEX REPLACE "^${P}" "" T "${D}")
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set(D ${T})
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endforeach ()
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endif ()
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set(grpc_pb_cc
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"${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.grpc.pb.cc")
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set(grpc_pb_h "${CMAKE_CURRENT_BINARY_DIR}/${D}/${file_stem}.grpc.pb.h")
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list(APPEND ${SRCS} "${grpc_pb_cc}" "${grpc_pb_h}")
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add_custom_command(
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OUTPUT "${grpc_pb_cc}" "${grpc_pb_h}"
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COMMAND
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$<TARGET_FILE:protobuf::protoc> ARGS
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--plugin=protoc-gen-grpc=$<TARGET_FILE:gRPC::grpc_cpp_plugin>
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"--grpc_out=${CMAKE_CURRENT_BINARY_DIR}"
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"--cpp_out=${CMAKE_CURRENT_BINARY_DIR}" ${protobuf_include_path}
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"${filename}"
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DEPENDS "${filename}" protobuf::protoc gRPC::grpc_cpp_plugin
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COMMENT "Running gRPC C++ protocol buffer compiler on ${filename}"
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VERBATIM)
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endforeach ()
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set_source_files_properties(${${SRCS}} PROPERTIES GENERATED TRUE)
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set(${SRCS}
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${${SRCS}}
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PARENT_SCOPE)
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endfunction ()
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include(GNUInstallDirs)
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# Install headers for a C++ proto library.
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function (google_cloud_cpp_install_proto_library_headers target)
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get_target_property(target_sources ${target} SOURCES)
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foreach (header ${target_sources})
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# Skip anything that is not a header file.
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if (NOT "${header}" MATCHES "\\.h$")
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continue()
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endif ()
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string(REPLACE "${CMAKE_CURRENT_BINARY_DIR}/" "" relative "${header}")
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get_filename_component(dir "${relative}" DIRECTORY)
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install(FILES "${header}"
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DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${dir}")
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endforeach ()
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endfunction ()
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# Install protos for a C++ proto library.
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function (google_cloud_cpp_install_proto_library_protos target strip_prefix)
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get_target_property(target_protos ${target} PROTO_SOURCES)
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foreach (proto ${target_protos})
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# Skip anything that is not a header file.
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if (NOT "${proto}" MATCHES "\\.proto$")
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continue()
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endif ()
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string(REPLACE "${strip_prefix}/" "" relative "${proto}")
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get_filename_component(dir "${relative}" DIRECTORY)
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# This is modeled after the Protobuf library, it installs the basic
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# protos (think google/protobuf/any.proto) in the include directory for
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# C/C++ code. :shrug:
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install(FILES "${proto}"
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DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/${dir}")
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endforeach ()
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endfunction ()
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function (google_cloud_cpp_proto_library libname)
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cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
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if (NOT _opt_UNPARSED_ARGUMENTS)
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message(SEND_ERROR "Error: google_cloud_cpp_proto_library() called"
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" without any proto files")
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return()
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endif ()
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google_cloud_cpp_generate_proto(
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proto_sources ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
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${_opt_PROTO_PATH_DIRECTORIES})
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add_library(${libname} ${proto_sources})
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set_property(TARGET ${libname} PROPERTY PROTO_SOURCES
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${_opt_UNPARSED_ARGUMENTS})
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target_link_libraries(${libname} PUBLIC gRPC::grpc++ gRPC::grpc
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protobuf::libprotobuf)
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target_include_directories(
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${libname}
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PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
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$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
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$<INSTALL_INTERFACE:include>)
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endfunction ()
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function (google_cloud_cpp_grpcpp_library libname)
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cmake_parse_arguments(_opt "" "" "PROTO_PATH_DIRECTORIES" ${ARGN})
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if (NOT _opt_UNPARSED_ARGUMENTS)
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message(SEND_ERROR "Error: google_cloud_cpp_proto_library() called"
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" without any proto files")
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return()
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endif ()
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google_cloud_cpp_generate_grpcpp(
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grpcpp_sources ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
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${_opt_PROTO_PATH_DIRECTORIES})
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google_cloud_cpp_proto_library(
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${libname} ${_opt_UNPARSED_ARGUMENTS} PROTO_PATH_DIRECTORIES
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${_opt_PROTO_PATH_DIRECTORIES})
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target_sources(${libname} PRIVATE ${grpcpp_sources})
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endfunction ()
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