Follow-up Comment #2, bug #66073 (group make): I am interested in this topic because this affects Linux kernel build system (Kbuild).
If foo.q does not appear in $?, I do not know how to make the combination of
if_changed and the grouped target working.
foo.p foo.q &: foo.r FORCE
$(call if_changed,gen_both)
This code works only after GNU Make commit
fabb03eac412b5ea19f1a97be31dc8c6fa7fc047.
But, a pattern rule never works.
%.p %.q : %.r FORCE
$(call if_changed,gen_both)
This is because $? is used to determine if the build rule should be really
executed.
This code:
https://github.com/torvalds/linux/blob/v6.11-rc2/scripts/Kbuild.include#L188
It is true that FORCE is contained in $?, but it is always filtered out.
When foo.q is missing or outdated and GNU Make is building foo.p,
if_changed skips the recipe.
I do not come up with a solution on Kbuild side.
Paul, what do you think?
I believe you know what I am saying because you contributed this:
https://github.com/torvalds/linux/commit/4f1933620f57145212cdbb1ac6ce099eeeb21c5a
Oh, It was 18 years ago...
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