linux-kernel - Re: [PATCH v2 2/2] kbuild: respect GNU Make -w flag

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Message-ID: <ZJBPNBrLSX+M2e4l@buildd.core.avm.de>
Date:   Mon, 19 Jun 2023 14:51:00 +0200
From:   Nicolas Schier <n.schier@....de>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH v2 2/2] kbuild: respect GNU Make -w flag

On Fri, Jun 16, 2023 at 11:57:51PM +0900, Masahiro Yamada wrote:
> Currently, -w (--print-directory) option is ignored, but it is better
> to respect the user's choice.
> 
> This commit changes the behavior of "Entering directory ..." logging.
> 
> If -w (or --print-directory) is given via the command line or the
> MAKEFLAGS environment variable, print "Entering directory ..." for every
> sub make.
> 
> If --no-print-directory is given via the command line or the MAKEFLAGS
> environment variable, suppress "Entering directory ..." completely.
> 
> If none of them is given, print "Entering directory ..." only when Kbuild
> changes the working directory. (default)
> 
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---

Tested-by: Nicolas Schier <n.schier@....de>

> 
> Changes in v2:
>   - new patch
> 
>  Makefile | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 916c1a7984b0..3867cdc3de5d 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -38,6 +38,12 @@ __all:
>  # descending is started. They are now explicitly listed as the
>  # prepare rule.
>  
> +ifeq ($(filter 3.%,$(MAKE_VERSION)),)
> +short-opts := $(firstword -$(MAKEFLAGS))
> +else
> +short-opts := $(filter-out --%,$(MAKEFLAGS))
> +endif
> +
>  ifneq ($(sub_make_done),1)
>  
>  # Do not use make's built-in rules and variables
> @@ -91,12 +97,6 @@ endif
>  # commands
>  # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
>  
> -ifeq ($(filter 3.%,$(MAKE_VERSION)),)
> -short-opts := $(firstword -$(MAKEFLAGS))
> -else
> -short-opts := $(filter-out --%,$(MAKEFLAGS))
> -endif
> -
>  ifneq ($(findstring s,$(short-opts)),)
>  quiet=silent_
>  override KBUILD_VERBOSE :=
> @@ -217,12 +217,16 @@ else
>  need-sub-make := 1
>  endif
>  
> +ifeq ($(findstring w, $(short-opts)),)
>  ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
>  # If --no-print-directory is unset, recurse once again to set it.
>  # You may end up with recursing into __sub-make twice. This is due to the
>  # behavior change for GNU Make 4.4.1.
>  need-sub-make := 1
>  endif
> +else
> +no-print-directory :=
> +endif
>  
>  ifeq ($(need-sub-make),1)
>  
> -- 
> 2.39.2
>