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# Copyright 2017 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# The CMakeLists.txt for zlib doesn't propagate include directories
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# transitively so `_gRPC_ZLIB_INCLUDE_DIR` should be set for gRPC
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# to find header files.
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if(gRPC_ZLIB_PROVIDER STREQUAL "module")
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if(NOT ZLIB_ROOT_DIR)
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set(ZLIB_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/zlib)
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endif()
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if(EXISTS "${ZLIB_ROOT_DIR}/CMakeLists.txt")
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# TODO(jtattermusch): workaround for https://github.com/madler/zlib/issues/218
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include_directories("${ZLIB_ROOT_DIR}")
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add_subdirectory(${ZLIB_ROOT_DIR} third_party/zlib)
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if(TARGET zlibstatic)
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set(_gRPC_ZLIB_LIBRARIES zlibstatic)
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set(_gRPC_ZLIB_INCLUDE_DIR "${ZLIB_ROOT_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/third_party/zlib")
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endif()
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else()
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message(WARNING "gRPC_ZLIB_PROVIDER is \"module\" but ZLIB_ROOT_DIR is wrong")
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endif()
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if(gRPC_INSTALL)
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message(WARNING "gRPC_INSTALL will be forced to FALSE because gRPC_ZLIB_PROVIDER is \"module\"")
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set(gRPC_INSTALL FALSE)
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endif()
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elseif(gRPC_ZLIB_PROVIDER STREQUAL "package")
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# zlib installation directory can be configured by setting ZLIB_ROOT
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# We allow locating zlib using both "CONFIG" and "MODULE" as the expectation
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# is that many Linux systems will have zlib installed via a distribution
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# package ("MODULE"), while on Windows the user is likely to have installed
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# zlib using cmake ("CONFIG").
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# See https://cmake.org/cmake/help/v3.6/module/FindZLIB.html
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find_package(ZLIB REQUIRED)
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if(TARGET ZLIB::ZLIB)
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set(_gRPC_ZLIB_LIBRARIES ZLIB::ZLIB)
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else()
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set(_gRPC_ZLIB_LIBRARIES ${ZLIB_LIBRARIES})
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endif()
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set(_gRPC_ZLIB_INCLUDE_DIR ${ZLIB_INCLUDE_DIRS})
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set(_gRPC_FIND_ZLIB "if(NOT ZLIB_FOUND)\n find_package(ZLIB)\nendif()")
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endif()
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