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Subject[PATCH] kbuild: add more hints about SUBDIRS replacement
Date
Commit 0126be38d988 ("kbuild: announce removal of SUBDIRS if used")
added a hint about the 'SUBDIRS' replacement, but it was not clear
enough.

Multiple people sent me similar questions, patches.

https://lkml.org/lkml/2019/1/17/456

I did not mean to suggest M= for building a subdirectory in the kernel
tree.

From the commit 669efc76b317 ("net: hns3: fix compile error"), people
already (ab)use M=... to do that because it seems to work to some extent.

Documentation/kbuild/kbuild.txt says M= and KBUILD_EXTMOD are used for
building external modules.

In fact, Kbuild supports the single target '%/' for this purpose, but
this may not be noticed much.

Kindly add more hints.

Makefile:213: ================= WARNING ================
Makefile:214: 'SUBDIRS' will be removed after Linux 5.3
Makefile:215:
Makefile:216: If you are building an individual subdirectory
Makefile:217: in the kernel tree, you can do like this:
Makefile:218: $ make path/to/dir/you/want/to/build/
Makefile:219: (Do not forget the trailing slash)
Makefile:220:
Makefile:221: If you are building an external module,
Makefile:222: Please use 'M=' or 'KBUILD_EXTMOD' instead
Makefile:223: ==========================================

Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Makefile | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/Makefile b/Makefile
index 7a7c17eb0cbf..823a39d940c6 100644
--- a/Makefile
+++ b/Makefile
@@ -212,6 +212,13 @@ endif
ifdef SUBDIRS
$(warning ================= WARNING ================)
$(warning 'SUBDIRS' will be removed after Linux 5.3)
+ $(warning )
+ $(warning If you are building an individual subdirectory)
+ $(warning in the kernel tree, you can do like this:)
+ $(warning $$ make path/to/dir/you/want/to/build/)
+ $(warning (Do not forget the trailing slash))
+ $(warning )
+ $(warning If you are building an external module,)
$(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
$(warning ==========================================)
KBUILD_EXTMOD ?= $(SUBDIRS)
--
2.17.1
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