[Bug driver/36312] should refuse to overwrite input file with output file

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36312

--- Comment #16 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to carlos from comment #15)
> It would be sufficient if /dev/null were special cased in some way for Linux
> configurations.

There is a pre-approved patch here
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63837#c12) that I'm testing.
Unfortunately, there seems to be a problem with the machine in the compile farm
that I use for gcc development, and I'm not able to finish a
bootstrap&regression test. I always get:

couldn't create output pipe for command: too many open files

even for a pristine copy of GCC. This didn't happen a few days ago. I didn't
have time yet to investigate what is wrong.