gcc for syntax check only (C): need to read source from stdin

[Zack Weinberg]

"Dave Korn" <dave.korn@artimi.com> writes:

>   Then the error message *really* ought to say
>
> gcc: -E or -x required when input is from standard input
>
> since it is thoroughly obtuse and non-explanatory as it stands.  The
> attached is against 4.0 RC1, but I imagine it'll apply cleanly to HEAD with
> just a little fuzz, if people feel it's the right thing.

Yes, I think this is the right thing.  Please test against mainline
and apply it there if successful.  I don't think it is important
enough to put into 4.0.0, but you should put it on the 4.0 branch
after the release, and maybe the 3.4 branch as well.

zw