Re: [BUG] --warn-undefined-variable is not triggered in prerequisites

[Martin Dorey]

That already seems to have been fixed:

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ cat Makefile

MAKEFLAGS += --warn-undefined-variables

a: $(foo); touch $@

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ ~/download/make/make --version

GNU Make 4.3.90

Built for x86_64-pc-linux-gnu

Copyright (C) 1988-2020 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ ~/download/make/make

Makefile:3: warning: undefined variable 'foo'

touch a

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$

That's today's git... and wasn't actually the point I wanted to make, which was:

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ rm a

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ make --version

GNU Make 4.1

Built for x86_64-pc-linux-gnu

Copyright (C) 1988-2014 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ make

touch a

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ rm a

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$ make --warn-undefined-variables

Makefile:3: warning: undefined variable 'foo'

touch a

martind@sirius:~/tmp/make-undefined-variables-2022-01-27$

---

From: Bug-make <bug-make-bounces+martin.dorey=hds.com@gnu.org> on behalf of Alejandro Colomar (man-pages) <alx.manpages@gmail.com>
Sent: Thursday, January 27, 2022 16:09
To: bug-make@gnu.org <bug-make@gnu.org>
Subject: [BUG] --warn-undefined-variable is not triggered in prerequisites

 

***** EXTERNAL EMAIL *****

Hi,

Consider the following scenario:


$ ls
Makefile
$ cat Makefile
MAKEFLAGS += --warn-undefined-variables

a: $(foo)
        touch $@
$ make
touch a
$ ls
a  Makefile



I'd like make to warn about this.  It took me a while to debug a
Makefile bug, which I thought was not happening, since make should have
warned me.  Isn't this supposed to trigger the warning?

Thanks,

Alex

--
Alejandro Colomar
Linux man-pages comaintainer; https://nam04.safelinks.protection.outlook.com/?url="">
https://nam04.safelinks.protection.outlook.com/?url="">