The GNU make manual, section 10.5.3, mentions the use of the SysV-style
automatic variables $$@, $$(@D), and $$(@F), and that these "bizarre" uses
are not necessary ("there are other ways to accomplish the same results").
How?
For example, I need to do some stuff like what's shown below, where the
prereq names are determined by a semi-complex manipulation of the target
name (it's actually much more complex than this example). This doesn't
work, though.
# assume there are MANY targets of the form "build_all", and the
# ${FN1} function needs to work for all of them
# (comp_all, clobber_all, etc.)
# this will set ACTION to the target name without the "_all" on
# the end, and then push that value on to the FN2 variable for
# further manipulation.
FN1 = $(foreach ACTION,$(patsubst %_all,%,$$@),${FN2})
FN2 = _${ACTION}_actions_
# the ${FN1} prereq in the following case should ultimately become
# the string "_build_actions_"
build_all : ${FN1}
_build_actions_ : other stuff
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