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

[Eli Zaretskii]

> Cc: 70716@debbugs.gnu.org
> From: João Távora <joaotavora@gmail.com>
> Date: Thu, 2 May 2024 14:13:49 +0100
> 
> On Thu, May 2, 2024 at 2:10 PM Mattias Engdegård 
> <mattias.engdegard@gmail.com> wrote:
> 
>  `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?
> 
>  
> Copying in Spencer Baugh, the new Flymake maintainer. 

Spencer, any comments or suggestions or patches?

Thanks.