cmake/abseil-cpp.cmake

if(TARGET absl::strings)
  # If absl is included already, skip including it.
  # (https://github.com/grpc/grpc/issues/29608)
elseif(protobuf_ABSL_PROVIDER STREQUAL "module")
  if(NOT ABSL_ROOT_DIR)
    set(ABSL_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/abseil-cpp)
  endif()
  if(EXISTS "${ABSL_ROOT_DIR}/CMakeLists.txt")
    if(protobuf_INSTALL)
      # When protobuf_INSTALL is enabled and Abseil will be built as a module,
      # Abseil will be installed along with protobuf for convenience.
      set(ABSL_ENABLE_INSTALL ON)
    endif()
    add_subdirectory(${ABSL_ROOT_DIR} third_party/abseil-cpp)
  else()
    message(WARNING "protobuf_ABSL_PROVIDER is \"module\" but ABSL_ROOT_DIR is wrong")
  endif()
  if(protobuf_INSTALL AND NOT _protobuf_INSTALL_SUPPORTED_FROM_MODULE)
    message(WARNING "protobuf_INSTALL will be forced to FALSE because protobuf_ABSL_PROVIDER is \"module\" and CMake version (${CMAKE_VERSION}) is less than 3.13.")
    set(protobuf_INSTALL FALSE)
  endif()
elseif(protobuf_ABSL_PROVIDER STREQUAL "package")
  # Use "CONFIG" as there is no built-in cmake module for absl.
  find_package(absl REQUIRED CONFIG)
endif()
set(_protobuf_FIND_ABSL "if(NOT TARGET absl::strings)\n  find_package(absl CONFIG)\nendif()")

set(protobuf_ABSL_USED_TARGETS
  absl::strings
  absl::strings_internal
)