HPX_CreateSymbolicLink.cmake

# Copyright (c) 2017 Denis Blank
#
# SPDX-License-Identifier: BSL-1.0
# Distributed under the Boost Software License, Version 1.0. (See accompanying
# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

# Creates a symbolic link from the destination to the target, if the link
# doesn't exist yet. Since `create_symlink` is only available for unix
# derivates, we work around that in this macro.
function(create_symbolic_link SYM_TARGET SYM_DESTINATION)
  if(WIN32)
    if(NOT EXISTS ${SYM_DESTINATION})
      if(IS_DIRECTORY ${SYM_TARGET})
        # Create a directory junction
        execute_process(
          COMMAND
            cmd /C
            "${PROJECT_SOURCE_DIR}/cmake/scripts/create_symbolic_link_directory.bat"
            ${SYM_DESTINATION} ${SYM_TARGET}
        )
      else()
        # Create a file link
        execute_process(
          COMMAND
            cmd /C
            "${PROJECT_SOURCE_DIR}/cmake/scripts/create_symbolic_link_file.bat"
            ${SYM_DESTINATION} ${SYM_TARGET}
        )
      endif()
    endif()
  else()
    # Only available on unix derivates
    execute_process(
      COMMAND "${CMAKE_COMMAND}" -E create_symlink ${SYM_TARGET}
              ${SYM_DESTINATION}
    )
  endif()
endfunction(create_symbolic_link)