contrib/gcc_update: silent mode

[Zack Weinberg]

"Kaveh R. Ghazi" <ghazi@caip.rutgers.edu> writes:

>  > From: Alexandre Oliva <aoliva at redhat dot com> 
>  > 
>  > On Mar 18, 2005, Zack Weinberg <zack@codesourcery.com> wrote:
>  > 
>  > > This patch adds a command-line option --silent to
>  > > contrib/gcc_update, which makes it not print any of its chatty
>  > > messages.
>  > 
>  > Unfortunately, ${silent+-Q} expands to -Q even if silent is blank.
>  > ${var+x} expands to x unless var is unset.  ${var:+x} would do what
>  > you meant, but it's not as portable, and unset isn't portable either.
>  > 
>  > How portable do we want gcc_update to be?
>
> Zack - instead of trying to find this elusive portable shell syntax,
> why not just set $silent to "-Q" instead of "t" and put $silent in the
> command line without any decoration?

Because it's not always "-Q".  See touch_files_reexec.

zw