This reverts commit096f93e73d. Revert "[Libomptarget] Make the plugins ingore undefined exported symbols" This reverts commit3f62314c23. Revert "[LLD] Enable --no-undefined-version by default." This reverts commit7ec8b0d162. Three commits are reverted because of the current omp build fail with GNU ld. See discussion here: https://reviews.llvm.org/rG096f93e73dc3