firebase-ios-sdk/cmake/external/zlib.cmake

# Copyright 2018 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.

include(ExternalProject)

if(TARGET zlib)
  return()
endif()

# Use a system- or user-supplied zlib if available
find_package(ZLIB)
if(ZLIB_FOUND)
  add_custom_target(zlib)
  return()
endif()

set(version 1.2.11)

ExternalProject_Add(
  zlib

  DOWNLOAD_DIR ${FIREBASE_DOWNLOAD_DIR}
  DOWNLOAD_NAME zlib-v${version}.tar.gz
  URL https://github.com/madler/zlib/archive/v${version}.tar.gz
  URL_HASH SHA256=629380c90a77b964d896ed37163f5c3a34f6e6d897311f1df2a7016355c45eff

  PREFIX ${PROJECT_BINARY_DIR}
  SOURCE_DIR ${PROJECT_BINARY_DIR}/src/zlib

  CONFIGURE_COMMAND ""
  BUILD_COMMAND     ""
  INSTALL_COMMAND   ""
  TEST_COMMAND      ""
)