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....@gnu.org> on behalf of Alejandro Colomar (man-pages) <alx.manpa...@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%3A%2F%2Fwww.kernel.org%2Fdoc%2Fman-pages%2F&data=04%7C01%7CMartin.Dorey%40hitachivantara.com%7Cdb85b53f39a34294e34b08d9e1f2772c%7C18791e1761594f52a8d4de814ca8284a%7C0%7C0%7C637789253777309722%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=DujTmko3LBJ%2BC8v%2BMkT4F1%2Ff0ErpexYxaSkNSqajGiA%3D&reserved=0 https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.alejandro-colomar.es%2F&data=04%7C01%7CMartin.Dorey%40hitachivantara.com%7Cdb85b53f39a34294e34b08d9e1f2772c%7C18791e1761594f52a8d4de814ca8284a%7C0%7C0%7C637789253777309722%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=V%2FMNo%2B3sMYu4LA5qK6q4SiKGg1rKRBQTuKUzhXh%2Fshc%3D&reserved=0
