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# Copyright 2018 Google
#
# 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.
# Executes a CMake build of the external dependencies, which will pull them
# as ExternalProjects, under an "external" subdirectory.
function(download_external_sources)
file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/external)
# Setup cmake environment.
# These commands are executed from within the currect context, which has set
# variables for the target platform. We use "env -i" to clear these
# variables, and manually keep the PATH to regular bash path.
if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
# Windows doesn't have an 'env' command
set(ENV_COMMAND "")
else()
set(firebase_command_line_path "$ENV{PATH}")
set(ENV_COMMAND env -i PATH=${firebase_command_line_path})
endif()
if (IOS)
set(external_platform IOS)
elseif(ANDROID)
set(external_platform ANDROID)
else()
set(external_platform DESKTOP)
endif()
# Set variables to indicate if local versions of third party libraries should
# be used instead of downloading them.
function(check_use_local_directory NAME)
if (EXISTS ${${NAME}_SOURCE_DIR})
set(DOWNLOAD_${NAME} OFF PARENT_SCOPE)
else()
set(DOWNLOAD_${NAME} ON PARENT_SCOPE)
endif()
endfunction()
check_use_local_directory(CURL)
check_use_local_directory(FLATBUFFERS)
check_use_local_directory(LIBUV)
check_use_local_directory(NANOPB)
check_use_local_directory(UWEBSOCKETS)
check_use_local_directory(ZLIB)
execute_process(
COMMAND
${ENV_COMMAND} cmake
-DCMAKE_INSTALL_PREFIX=${FIREBASE_INSTALL_DIR}
-DFIREBASE_DOWNLOAD_DIR=${FIREBASE_DOWNLOAD_DIR}
-DFIREBASE_EXTERNAL_PLATFORM=${external_platform}
-DDOWNLOAD_CURL=${DOWNLOAD_CURL}
-DDOWNLOAD_FLATBUFFERS=${DOWNLOAD_FLATBUFFERS}
-DDOWNLOAD_LIBUV=${DOWNLOAD_LIBUV}
-DDOWNLOAD_NANOPB=${DOWNLOAD_NANOPB}
-DDOWNLOAD_UWEBSOCKETS=${DOWNLOAD_UWEBSOCKETS}
-DDOWNLOAD_ZLIB=${DOWNLOAD_ZLIB}
${PROJECT_SOURCE_DIR}/cmake/external
OUTPUT_FILE ${PROJECT_BINARY_DIR}/external/output_cmake_config.txt
WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/external
)
# Run downloads in parallel if we know how
if(CMAKE_GENERATOR STREQUAL "Unix Makefiles")
set(cmake_build_args -j)
endif()
execute_process(
COMMAND ${ENV_COMMAND} cmake --build . -- ${cmake_build_args}
OUTPUT_FILE ${PROJECT_BINARY_DIR}/external/output_cmake_build.txt
WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/external
)
endfunction()
# Populates directory variables for the given name to the location that name
# would be in after a call to download_external_sources, if the variable is
# not already a valid directory.
# Adds the source directory as a subdirectory if a CMakeLists file is found.
function(add_external_library NAME)
string(TOUPPER ${NAME} UPPER_NAME)
if (NOT EXISTS ${${UPPER_NAME}_SOURCE_DIR})
set(${UPPER_NAME}_SOURCE_DIR "${FIREBASE_BINARY_DIR}/external/src/${NAME}")
set(${UPPER_NAME}_SOURCE_DIR "${${UPPER_NAME}_SOURCE_DIR}" PARENT_SCOPE)
endif()
if (NOT EXISTS ${${UPPER_NAME}_BINARY_DIR})
set(${UPPER_NAME}_BINARY_DIR "${${UPPER_NAME}_SOURCE_DIR}-build")
set(${UPPER_NAME}_BINARY_DIR "${${UPPER_NAME}_BINARY_DIR}" PARENT_SCOPE)
endif()
if (EXISTS "${${UPPER_NAME}_SOURCE_DIR}/CMakeLists.txt")
add_subdirectory(${${UPPER_NAME}_SOURCE_DIR} ${${UPPER_NAME}_BINARY_DIR}
EXCLUDE_FROM_ALL)
endif()
endfunction()
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