GNU bug report logs - #70716
flymake-cc creates `-.o` files

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Subject: bug#70716: closed (Re: bug#70716: flymake-cc creates `-.o` files)
Date: Wed, 28 Aug 2024 17:53:02 +0000

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Your bug report

#70716: flymake-cc creates `-.o` files

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 70716 <at> debbugs.gnu.org.

-- 
70716: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70716
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Spencer Baugh <sbaugh <at> janestreet.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 70716-done <at> debbugs.gnu.org,
 João Távora <joaotavora <at> gmail.com>
Subject: Re: bug#70716: flymake-cc creates `-.o` files
Date: Wed, 28 Aug 2024 19:50:00 +0200

28 aug. 2024 kl. 19.01 skrev sbaugh <at> catern.com:

> check-syntax:
> 	gcc -o /dev/null -S ${CHK_SOURCES} || true
> 
> So it seems like it would be better to add this -o /dev/null in your
> Makefile.

Actually not my Makefile but that of flymake-tests.
Anyway, now done on master, thank you!

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From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Emacs Bug Report <bug-gnu-emacs <at> gnu.org>
Cc: João Távora <joaotavora <at> gmail.com>
Subject: flymake-cc creates `-.o` files
Date: Thu, 2 May 2024 15:10:18 +0200

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`flymake-cc-use-special-make-target`, the standard value for `flymake-cc-command`, generates a command like

  make check-syntax CHK_SOURCES="-x c -c -"

which causes the compiler (at least Clang) to create the file `-.o` that is never cleaned up and whose name is mysterious and awkward to remove.

What about the patch below?

[flymake-cc-null-output.diff (application/octet-stream, attachment)]

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