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Fix a GNU Make macro bug that prevents
make use=dtrace
to workcorrectly on FreeBSD and Linux+SystemTap platforms. I don't
understand exactly why, but using
$(shell which dtrace 2> /dev/null)
inside of the
USE_CHECK
macro definition always results in theempty string.
When moved outside of the macro definition, plus using
+=
toupdate the value of
$(DTRACE)
, works correctly on bothFreeBSD's GNU Make 4.2.1 and Ubuntu Xenial/16.04's GNU Make 4.1.