Re: [Qemu-devel] [PATCH v2 02/13] build-sys: silence make by default or V=0

[Eric Blake <eblake@redhat.com>]

On 12/15/2017 09:06 AM, Marc-André Lureau wrote:
> Move generic make flags in MAKEFLAGS (SUBDIR_MAKEFLAGS is more qemu specific).
> 
> Use --quiet to silence make 'is up to date' message.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
> ---
>   Makefile  | 2 +-
>   rules.mak | 2 ++
>   2 files changed, 3 insertions(+), 1 deletion(-)

Tested-by: Eric Blake <eblake@redhat.com>

I'd still like a second opinion from another make expert (Paolo?) on 
whether this makes sense.  Thus, even though it looks sane to me, I'm 
not (yet) giving R-b.

> 
> diff --git a/Makefile b/Makefile
> index 0331c182ed..199f39fde1 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -274,7 +274,7 @@ else
>   DOCS=
>   endif
>   
> -SUBDIR_MAKEFLAGS=$(if $(V),,--no-print-directory) BUILD_DIR=$(BUILD_DIR)
> +SUBDIR_MAKEFLAGS=BUILD_DIR=$(BUILD_DIR)
>   SUBDIR_DEVICES_MAK=$(patsubst %, %/config-devices.mak, $(TARGET_DIRS))
>   SUBDIR_DEVICES_MAK_DEP=$(patsubst %, %-config-devices.mak.d, $(TARGET_DIRS))
>   
> diff --git a/rules.mak b/rules.mak
> index 6e943335f3..5fb4951561 100644
> --- a/rules.mak
> +++ b/rules.mak
> @@ -131,6 +131,8 @@ modules:
>   # If called with only a single argument, will print nothing in quiet mode.
>   quiet-command = $(if $(V),$1,$(if $(2),@printf "  %-7s %s\n" $2 $3 && $1, @$1))
>   
> +MAKEFLAGS += $(if $(V),,--no-print-directory --quiet)
> +
>   # cc-option
>   # Usage: CFLAGS+=$(call cc-option, -falign-functions=0, -malign-functions=0)
>   
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org