Re: Surprising pattern matching and .EXTRA_PREREQS behaviours

[Dmitry Goncharov]

On Mon, Nov 20, 2023 at 8:37 AM Daniel Gerber <dg@atufi.org> wrote:

> 1. Second expansion is not applied to .EXTRA_PREREQS

Thanks for your report. You can find a patch here
https://savannah.gnu.org/bugs/index.php?65006.


> 2. Setting .EXTRA_PREREQS as pattern-specific variable is not supported

A couple of years ago i implemented pattern-specific .EXTRA_PREREQS.
The impl is here
https://github.com/dgoncharov/make/tree/pattern_specific_extra_prereqs.
i wanted a more efficient impl and this impl is still not merged.


> 1. How to add a prerequisite to all targets matching some pattern - in
particular, their parent directory?


.SECONDEXPANSION:
%.ext:| $$(@D)/;
%/:; mkdir -p $@


Another option

obj/%.ext:| obj;
obj/:; mkdir -p obj


> 2. How to set a variable for all targets matching <dirs>/prefix_<stem>?

dirs/prefix_%: hello=world

regards, Dmitry