1# Copyright 2019 Google LLC 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# Create an alias for SOURCE, called DESTINATION. 16# 17# On platforms that support them, this rule will effectively create a symlink. 18# 19# SOURCE may be relative to CMAKE_CURRENT_SOURCE_DIR, or absolute. 20# DESTINATION may relative to CMAKE_CURRENT_BINARY_DIR, or absolute. 21# 22# Adapted from https://github.com/google/binexport/blob/master/util.cmake 23function(add_directory_alias SOURCE DESTINATION) 24 get_filename_component(_destination_parent "${DESTINATION}" DIRECTORY) 25 file(MAKE_DIRECTORY "${_destination_parent}") 26 27 if (WIN32) 28 file(TO_NATIVE_PATH "${SOURCE}" _native_source) 29 file(TO_NATIVE_PATH "${DESTINATION}" _native_destination) 30 execute_process(COMMAND $ENV{ComSpec} /c mklink /J "${_native_destination}" "${_native_source}" ERROR_QUIET) 31 else() 32 execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${SOURCE}" "${DESTINATION}") 33 endif() 34endfunction(add_directory_alias) 35