Re: [PATCH] gcc-ar: Handle response files properly [PR77576]

Re: [PATCH] gcc-ar: Handle response files properly [PR77576]

Problem: gcc-ar fails when a @file is passed to it:

$ cat rsp
--version
$ gcc-ar @rsp
/usr/bin/ar: invalid option -- '@'

This is because a dash '-' is prepended to the first
argument if it doesn't start with one, resulting in
the wrong call 'ar -@rsp'.

Fix: Expand argv to get rid of any @files and if any
expansions were made, pass everything through a
temporary response file.

$ gcc-ar @rsp
GNU ar (GNU Binutils for Debian) 2.35.2
...

gcc/
	PR driver/77576
	* gcc-ar.cc (main): Expand argv and use
	temporary response file to call ar if any
	expansions were made.