[Bug driver/77576] gcc-ar doesn't work if all options are read from file

[costas.argyris at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77576

--- Comment #7 from Costas Argyris <costas.argyris at gmail dot com> ---
Implemented what Andrew said:

"I suspect we should expand the @file and then put it in a temp file and do the
correct thing."

Attached patch here but also sending to gcc-patches ML.