cmake/packages/protobuf/protobuf_patcher.cmake

# Copyright 2026 Google LLC.
#
# 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.# protobuf_patcher.cmake


message(STATUS "[LiteRTLM] Injecting shim into Protobuf root...")

set(ROOT_LIST "${PROTO_SRC_DIR}/CMakeLists.txt")

if(EXISTS "${ROOT_LIST}")
    file(READ "${ROOT_LIST}" CONTENT)
    string(REPLACE "project(protobuf C CXX)"
               "project(protobuf C CXX)\ninclude(${LITERTLM_PROTO_SHIM_PATH})"
               CONTENT "${CONTENT}")
    file(WRITE "${ROOT_LIST}" "${INJECTION}${CONTENT}")
    message(STATUS "[LiteRTLM] Injection successful.")
else()
    message(FATAL_ERROR "Could not find Protobuf root CMakeLists.txt at ${ROOT_LIST}")
endif()

set(_proto_cmake_files
    "cmake/libupb.cmake"
    "cmake/libprotoc.cmake"
    "cmake/libprotobuf.cmake"
    "cmake/libprotobuf-lite.cmake"
)

foreach(_file IN LISTS _proto_cmake_files)
    set(_path "${PROTO_SRC_DIR}/${_file}")
    if(EXISTS "${_path}")
        message(STATUS "[LiteRTLM] Patching visibility in ${_file}")
        file(READ "${_path}" _content)
        string(REPLACE "CXX_VISIBILITY_PRESET hidden"
            "CXX_VISIBILITY_PRESET default" _content "${_content}")
        string(REPLACE "VISIBILITY_INLINES_HIDDEN ON"
            "VISIBILITY_INLINES_HIDDEN OFF" _content "${_content}")
        file(WRITE "${_path}" "${_content}")
    endif()
endforeach()