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# Copyright The OpenTelemetry Authors
# SPDX-License-Identifier: Apache-2.0
# Import Protobuf targets (protobuf::libprotobuf and protobuf::protoc) and set PROTOBUF_PROTOC_EXECUTABLE.
# 1. If gRPC was fetched from github then use the Protobuf submodule built with gRPC
# 2. Find an installed Protobuf package
# 3. Use FetchContent to fetch and build Protobuf from GitHub
if(DEFINED gRPC_PROVIDER AND NOT gRPC_PROVIDER STREQUAL "find_package" AND TARGET libprotobuf)
# gRPC was fetched and built Protobuf as a submodule
set(_Protobuf_VERSION_REGEX "\"cpp\"[ \t]*:[ \t]*\"([0-9]+\\.[0-9]+(\\.[0-9]+)?)\"")
set(_Protobuf_VERSION_FILE "${grpc_SOURCE_DIR}/third_party/protobuf/version.json")
file(READ "${_Protobuf_VERSION_FILE}" _Protobuf_VERSION_FILE_CONTENTS)
if(_Protobuf_VERSION_FILE_CONTENTS MATCHES ${_Protobuf_VERSION_REGEX})
set(Protobuf_VERSION "${CMAKE_MATCH_1}")
else()
message(WARNING "Failed to parse Protobuf version from ${_Protobuf_VERSION_FILE} using regex ${_Protobuf_VERSION_REGEX}")
endif()
set(Protobuf_PROVIDER "grpc_submodule")
else()
# Search for an installed Protobuf package explicitly using the CONFIG search mode first followed by the MODULE search mode.
# Protobuf versions < 3.22.0 may be found using the module mode and some protobuf apt packages do not support the CONFIG search.
find_package(Protobuf CONFIG QUIET)
set(Protobuf_PROVIDER "find_package")
if(NOT Protobuf_FOUND)
find_package(Protobuf MODULE QUIET)
endif()
if(NOT Protobuf_FOUND)
FetchContent_Declare(
"protobuf"
GIT_REPOSITORY "https://github.com/protocolbuffers/protobuf.git"
GIT_TAG "${protobuf_GIT_TAG}"
)
set(protobuf_INSTALL ${OPENTELEMETRY_INSTALL} CACHE BOOL "" FORCE)
set(protobuf_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(protobuf_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
FetchContent_MakeAvailable(protobuf)
set(Protobuf_PROVIDER "fetch_repository")
# Set the Protobuf_VERSION variable from the git tag.
string(REGEX REPLACE "^v([0-9]+\\.[0-9]+\\.[0-9]+)$" "\\1" Protobuf_VERSION "${protobuf_GIT_TAG}")
if(TARGET libprotobuf)
set_target_properties(libprotobuf PROPERTIES POSITION_INDEPENDENT_CODE ON CXX_CLANG_TIDY "" CXX_INCLUDE_WHAT_YOU_USE "")
endif()
endif()
endif()
if(NOT TARGET protobuf::libprotobuf)
message(FATAL_ERROR "A required protobuf target (protobuf::libprotobuf) was not imported")
endif()
if(PROTOBUF_PROTOC_EXECUTABLE AND NOT Protobuf_PROTOC_EXECUTABLE)
message(WARNING "Use of PROTOBUF_PROTOC_EXECUTABLE is deprecated. Please use Protobuf_PROTOC_EXECUTABLE instead.")
set(Protobuf_PROTOC_EXECUTABLE "${PROTOBUF_PROTOC_EXECUTABLE}")
endif()
if(CMAKE_CROSSCOMPILING)
find_program(Protobuf_PROTOC_EXECUTABLE protoc)
else()
if(NOT TARGET protobuf::protoc)
message(FATAL_ERROR "A required protobuf target (protobuf::protoc) was not imported")
endif()
set(Protobuf_PROTOC_EXECUTABLE "$<TARGET_FILE:protobuf::protoc>")
endif()
set(PROTOBUF_PROTOC_EXECUTABLE "${Protobuf_PROTOC_EXECUTABLE}")
message(STATUS "PROTOBUF_PROTOC_EXECUTABLE=${PROTOBUF_PROTOC_EXECUTABLE}")
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