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 15# The CMakeLists.txt for zlib doesn't propagate include directories 16# transitively so `_gRPC_ZLIB_INCLUDE_DIR` should be set for gRPC 17# to find header files. 18 19if(gRPC_ZLIB_PROVIDER STREQUAL "module") 20 if(NOT ZLIB_ROOT_DIR) 21 set(ZLIB_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/zlib) 22 endif() 23 if(EXISTS "${ZLIB_ROOT_DIR}/CMakeLists.txt") 24 # TODO(jtattermusch): workaround for https://github.com/madler/zlib/issues/218 25 include_directories("${ZLIB_ROOT_DIR}") 26 add_subdirectory(${ZLIB_ROOT_DIR} third_party/zlib) 27 28 if(TARGET zlibstatic) 29 set(_gRPC_ZLIB_LIBRARIES zlibstatic) 30 set(_gRPC_ZLIB_INCLUDE_DIR "${ZLIB_ROOT_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/third_party/zlib") 31 if(gRPC_INSTALL AND _gRPC_INSTALL_SUPPORTED_FROM_MODULE) 32 install(TARGETS zlibstatic EXPORT gRPCTargets 33 RUNTIME DESTINATION ${gRPC_INSTALL_BINDIR} 34 LIBRARY DESTINATION ${gRPC_INSTALL_LIBDIR} 35 ARCHIVE DESTINATION ${gRPC_INSTALL_LIBDIR}) 36 endif() 37 endif() 38 else() 39 message(WARNING "gRPC_ZLIB_PROVIDER is \"module\" but ZLIB_ROOT_DIR is wrong") 40 endif() 41 if(gRPC_INSTALL AND NOT _gRPC_INSTALL_SUPPORTED_FROM_MODULE) 42 message(WARNING "gRPC_INSTALL will be forced to FALSE because gRPC_ZLIB_PROVIDER is \"module\" and CMake version (${CMAKE_VERSION}) is less than 3.13.") 43 set(gRPC_INSTALL FALSE) 44 endif() 45elseif(gRPC_ZLIB_PROVIDER STREQUAL "package") 46 # zlib installation directory can be configured by setting ZLIB_ROOT 47 # We allow locating zlib using both "CONFIG" and "MODULE" as the expectation 48 # is that many Linux systems will have zlib installed via a distribution 49 # package ("MODULE"), while on Windows the user is likely to have installed 50 # zlib using cmake ("CONFIG"). 51 # See https://cmake.org/cmake/help/v3.6/module/FindZLIB.html 52 find_package(ZLIB REQUIRED) 53 54 if(TARGET ZLIB::ZLIB) 55 set(_gRPC_ZLIB_LIBRARIES ZLIB::ZLIB) 56 else() 57 set(_gRPC_ZLIB_LIBRARIES ${ZLIB_LIBRARIES}) 58 endif() 59 set(_gRPC_ZLIB_INCLUDE_DIR ${ZLIB_INCLUDE_DIRS}) 60 set(_gRPC_FIND_ZLIB "if(NOT ZLIB_FOUND)\n find_package(ZLIB)\nendif()") 61endif() 62