1# Copyright 2017 gRPC authors. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14 15if(gRPC_CARES_PROVIDER STREQUAL "module") 16 if(NOT CARES_ROOT_DIR) 17 set(CARES_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/cares/cares) 18 endif() 19 set(CARES_SHARED OFF CACHE BOOL "disable shared library") 20 set(CARES_STATIC ON CACHE BOOL "link cares statically") 21 if(gRPC_BACKWARDS_COMPATIBILITY_MODE) 22 # See https://github.com/grpc/grpc/issues/17255 23 set(HAVE_LIBNSL OFF CACHE BOOL "avoid cares dependency on libnsl") 24 endif() 25 add_subdirectory("${CARES_ROOT_DIR}" third_party/cares/cares) 26 27 if(TARGET c-ares) 28 set(_gRPC_CARES_LIBRARIES c-ares) 29 if(gRPC_INSTALL AND _gRPC_INSTALL_SUPPORTED_FROM_MODULE) 30 install(TARGETS c-ares EXPORT gRPCTargets 31 RUNTIME DESTINATION ${gRPC_INSTALL_BINDIR} 32 LIBRARY DESTINATION ${gRPC_INSTALL_LIBDIR} 33 ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}) 34 endif() 35 endif() 36 37 if(gRPC_INSTALL AND NOT _gRPC_INSTALL_SUPPORTED_FROM_MODULE) 38 message(WARNING "gRPC_INSTALL will be forced to FALSE because gRPC_CARES_PROVIDER is \"module\" and CMake version (${CMAKE_VERSION}) is less than 3.13.") 39 set(gRPC_INSTALL FALSE) 40 endif() 41elseif(gRPC_CARES_PROVIDER STREQUAL "package") 42 find_package(c-ares 1.13.0 REQUIRED) 43 if(TARGET c-ares::cares) 44 set(_gRPC_CARES_LIBRARIES c-ares::cares) 45 endif() 46 set(_gRPC_FIND_CARES "if(NOT c-ares_FOUND)\n find_package(c-ares)\nendif()") 47endif() 48