Hi,
I try to use a template to generate a set of "other" variables based on a
existing set of "base" variables. The "other" variables do not appear to
be created, and show up as being empty. I use a combination of define,
foreach and eval, as explained in section 8.8 of the manual.
Here is my code:
# The default set of variables, base_first_args and base_second_args
base_first_args=one
base_args+=$(base_first_args)
key_list=first
base_second_args=two
base_args+=$(base_second_args)
key_list+=second
TARGETS=base_target
# Templating starts here
define copy_vars
$(1)_$(2)_args=$$(base_$(2)_args)
$(1)_args+=$$($(1)_$(2)_args)
endef
# From now on, users can copy the "base" variables into their own vars
$(foreach key,$(key_list),$(eval $(call copy_vars,other,$(key))))
TARGETS+=other_target
all: $(TARGETS)
%_target:
@echo RULE: target=$@ args=$*_args expanded_args=$($*_args)
When I type make, it builds both targets, but the echo shows that
$($*_args) value is empty for the variable generated with the template
(e.g. $(other_args) is empty???). Help!
Thanks,
Martin
Using make v3.79.1.
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