Hi.
I have a question about $? behavior.
The manual says:
$?
The names of all the prerequisites that are newer than the target,
with spaces between them.
It does not explicitly explain about non-existing prerequisites,
but Paul explained the change in GNU Make 3.81 as follows:
http://lists.gnu.org/archive/html/bug-make/2006-03/msg00003.html
So, non-existing prerequisites are included in $?
and I agree this is the right thing to do.
However, I noticed the behavior is changed
when prerequisites are marked as .SECONDARY.
[Test Code 1]
------------------>8---------------
foo: bar FORCE
@echo newer prerequisites are: $?
bar:
.PHONY: FORCE
------------------>8---------------
Result:
$ touch foo; make
newer prerequisites are: bar FORCE
Good.
$? correctly contains 'bar' and 'FORCE'.
This is what we expect
because 'bar' and 'FORCE' do not exist.
If you add .SECONDARY:,
the behavior is different.
[Test Code 2]
------------------>8---------------
foo: bar FORCE
@echo newer prerequisites are: $?
bar:
.PHONY: FORCE
.SECONDARY:
------------------>8---------------
Result:
$ touch foo; make
newer prerequisites are:
Oh.
$? does not include 'bar' and 'FORCE' any more
despite they do not exist.
Why is $? affected by the .SECONDARY special target?
Is this intentional?
--
Best Regards
Masahiro Yamada
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