linux-kernel - Re: [PATCH] Revert "kbuild: merge scripts/mkmakefile to top Makefile"

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Message-ID: <CAK7LNASEqKwQeLPXedyut+ykSJGPuq3CO1g_fS=sVDaZrwBPBQ@mail.gmail.com>
Date:   Thu, 27 May 2021 03:56:41 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Michal Suchanek <msuchanek@...e.de>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Revert "kbuild: merge scripts/mkmakefile to top Makefile"

On Thu, May 27, 2021 at 2:39 AM Michal Suchanek <msuchanek@...e.de> wrote:
>
> This reverts commit 243b50c141d71fcf7b88e94474b3b9269f0b1f9d.
>
> When packaging the kernel it is built in different place from the one in
> which it will be installed. After build the makefile needs to be
> regenerated with the target location but with mkmakefile merged into
> Makefile tehre is no way to do that.
>
> Signed-off-by: Michal Suchanek <msuchanek@...e.de>

My patch was not working as expected
regardless of packaging.

Does the following fix-up work for you?


diff --git a/Makefile b/Makefile
index 54bb019a7da3..504327207d66 100644
--- a/Makefile
+++ b/Makefile
@@ -552,16 +552,13 @@ ifdef building_out_of_srctree
 # At the same time when output Makefile generated, generate .gitignore to
 # ignore whole output directory

-quiet_cmd_makefile = GEN     $@
+quiet_cmd_makefile = GEN     Makefile
       cmd_makefile = { \
        echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
        echo "include $(srctree)/Makefile"; \
-       } > $@
+       } > Makefile

-Makefile: FORCE
-       $(call cmd,makefile)
-
-outputmakefile: Makefile
+outputmakefile:
        $(Q)if [ -f $(srctree)/.config -o \
                 -d $(srctree)/include/config -o \
                 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
@@ -572,6 +569,7 @@ outputmakefile: Makefile
                false; \
        fi
        $(Q)ln -fsn $(srctree) source
+       $(call cmd,makefile)
        $(Q)test -e .gitignore || \
        { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
 endif















> ---
>  Makefile           | 15 +++------------
>  scripts/mkmakefile | 17 +++++++++++++++++
>  2 files changed, 20 insertions(+), 12 deletions(-)
>  create mode 100755 scripts/mkmakefile
>
> diff --git a/Makefile b/Makefile
> index 58b086b30144..462899c1b5d7 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -573,24 +573,14 @@ scripts_basic:
>         $(Q)rm -f .tmp_quiet_recordmcount
>
>  PHONY += outputmakefile
> -ifdef building_out_of_srctree
>  # Before starting out-of-tree build, make sure the source tree is clean.
>  # outputmakefile generates a Makefile in the output directory, if using a
>  # separate output directory. This allows convenient use of make in the
>  # output directory.
>  # At the same time when output Makefile generated, generate .gitignore to
>  # ignore whole output directory
> -
> -quiet_cmd_makefile = GEN     $@
> -      cmd_makefile = { \
> -       echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
> -       echo "include $(srctree)/Makefile"; \
> -       } > $@
> -
> -Makefile: FORCE
> -       $(call cmd,makefile)
> -
> -outputmakefile: Makefile
> +outputmakefile:
> +ifdef building_out_of_srctree
>         $(Q)if [ -f $(srctree)/.config -o \
>                  -d $(srctree)/include/config -o \
>                  -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
> @@ -601,6 +591,7 @@ outputmakefile: Makefile
>                 false; \
>         fi
>         $(Q)ln -fsn $(srctree) source
> +       $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
>         $(Q)test -e .gitignore || \
>         { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
>  endif
> diff --git a/scripts/mkmakefile b/scripts/mkmakefile
> new file mode 100755
> index 000000000000..1cb174751429
> --- /dev/null
> +++ b/scripts/mkmakefile
> @@ -0,0 +1,17 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# Generates a small Makefile used in the root of the output
> +# directory, to allow make to be started from there.
> +# The Makefile also allow for more convinient build of external modules
> +
> +# Usage
> +# $1 - Kernel src directory
> +
> +if [ "${quiet}" != "silent_" ]; then
> +       echo "  GEN     Makefile"
> +fi
> +
> +cat << EOF > Makefile
> +# Automatically generated by $0: don't edit
> +include $1/Makefile
> +EOF
> --
> 2.26.2
>


-- 
Best Regards
Masahiro Yamada