define: DUK_USE_UNDERSCORE_SETJMP
feature_enables: DUK_OPT_UNDERSCORE_SETJMP
introduced: 1.1.0
default: false
tags:
  - portability
description: >
  Use _setjmp/_longjmp for long control transfers.  This ensures signal
  mask is not saved which can be a lot faster if setjmp/longjmp saves the
  signal mask (this varies between platforms).  See comments in
  DUK_USE_SETJMP.

# FIXME: to be removed, DUK_SETJMP() is used instead?