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

[Alejandro Colomar (man-pages)]

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://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/