[U-Boot] [PATCH] tools/Makefile: suppress "which swig" error output

[Simon Glass]

On 19 November 2016 at 05:04, Andre Przywara <andre.przywara at arm.com> wrote:
> The Makefile in tools/ tries to find the "swig" utility by calling "which".
> If nothing is found in the path, some versions of which will print an error
> message:
> $ make clean
> which: no swig in (/usr/local/bin:/usr/bin:/bin)
>
> This does not apply to all version of "which", though:
> $ echo $0
> bash
> $ type which
> which is aliased to `type -path'
> $ which foo                             <== this version is OK
> $ /usr/bin/which foo                    <== this one is chatty
> /usr/bin/which: no foo in (/usr/local/bin:/usr/bin:/bin)
> $ sh                                    <== make uses /bin/sh
> sh-4.3$ which foo                       <== no alias here
> which: no foo in (/usr/local/bin:/usr/bin:/bin)
>
> This error message is rather pointless in our case, since we just have
> this very check to care for this. So add stderr redirection to suppress
> the message.
>
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> ---
>  tools/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Simon Glass <sjg at chromium.org>