Follow-up Comment #3, bug #28456 (project make):
Update:
It seems current make behaviour is inconsisten with its manual. I quote
`Secondary Expansion of Implicit Rules':
"""
As `make' searches for an implicit rule, it substitutes the stem and
then performs secondary expansion for every rule with a matching target
pattern. The value of the automatic variables is derived in the same
fashion as for static pattern rules. As an example:
.SECONDEXPANSION:
foo: bar
foo foz: fo%: bo%
%oo: $$< $$^ $$+ $$*
When the implicit rule is tried for target `foo', `$$<' expands to
`bar', `$$^' expands to `bar boo', `$$+' also expands to `bar boo', and
`$$*' expands to `f'.
"""
So let's verify that:
$ cat se-manual.mk
.SECONDEXPANSION:
foo: bar
foo foz: fo%: bo%
show-vars =
$(info $$@ : $@)
$(info $$< : $<)
$(info $$^ : $^)
$(info $$+ : $+)
$(info $$* : $*)
%oo: $$(show-vars)
touch $@
$ touch bar && make -f se-manual.mk foo
$@ : foo
$< : foo
$^ : bar boo
$+ : bar boo
$* : f
$@ : boo
$< : boo
$^ :
$+ :
$* : b
touch foo
Take a closer look to first 5 output lines starting with `$@ : foo'. The
manual says "When the implicit rule is tried for
target `foo', `$$<' expands to `bar', `$$^' expands to `bar
boo', `$$+' also expands to `bar boo', and `$$*' expands to `f'"
But it seems we have $$< = foo (!= bar).
Could please anyone clarify, what is the right behaviour and how (if whether)
we need to fix it.
Thanks beforehand,
Kirill
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