linux-kernel - [PATCH] kbuild: make Makefile|Kbuild in each directory optional

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Date:   Wed, 24 Jan 2018 17:41:19 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     linux-kbuild@...r.kernel.org, davem@...emloft.net
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH] kbuild: make Makefile|Kbuild in each directory optional

It is useful to be able to build single object files, e.g.:
$ make net/sched/cls_flower.o W=1 C=2

Currently kbuild does a hard include of a Kbuild or Makefile
for directory where that object would reside.  Kbuild doesn't
cater too well to multi-directory drivers, meaning such drivers
will usually only use a single central Makefile.  This in turn
means it will be impossible to build most of object files
individually for such drivers.

Make the include of $dir/{Makefile,Kbuild} optional.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@...ronome.com>
---
I must admit I have no idea whose tree I should send this to :(
Could it go via net-next if no one on linux-kbuild objects?

 scripts/Makefile.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 47cddf32aeba..178864f877d5 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -42,7 +42,7 @@ save-cflags := $(CFLAGS)
 # The filename Kbuild has precedence over Makefile
 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
-include $(kbuild-file)
+-include $(kbuild-file)
 
 # If the save-* variables changed error out
 ifeq ($(KBUILD_NOPEDANTIC),)
-- 
2.15.1