O2DefineRPATH.cmake

# Copyright 2019-2020 CERN and copyright holders of ALICE O2.
# See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
# All rights not expressly granted are reserved.
#
# This software is distributed under the terms of the GNU General Public
# License v3 (GPL Version 3), copied verbatim in the file "COPYING".
#
# In applying this license CERN does not waive the privileges and immunities
# granted to it by virtue of its status as an Intergovernmental Organization
# or submit itself to any jurisdiction.

include_guard()

include(GNUInstallDirs)

#
# o2_define_rpath defines our RPATH settings
#
function(o2_define_rpath)

  if(APPLE)
    set(basePoint @loader_path)
  else()
    set(basePoint $ORIGIN)
  endif()

  # use, i.e. do not skip, the full RPATH in the _build_ tree
  set(CMAKE_SKIP_BUILD_RPATH FALSE PARENT_SCOPE)
  # when building, do not use the install RPATH already (will only be used when
  # actually installing), unless we are on a Mac (where the install is otherwise
  # pretty slow)
  set(CMAKE_BUILD_WITH_INSTALL_RPATH FALSE PARENT_SCOPE)
  if(APPLE)
    set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE PARENT_SCOPE)
  endif()

  # add to the install RPATH the (automatically determined) parts of the RPATH
  # that point to directories outside the build tree
  set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE PARENT_SCOPE)

  # specify libraries directory relative to binaries one.
  file(RELATIVE_PATH relDir ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}
       ${CMAKE_LIBRARY_OUTPUT_DIRECTORY})

  set(CMAKE_INSTALL_RPATH ${basePoint} ${basePoint}/${relDir} PARENT_SCOPE)

endfunction()