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kbuild: announce removal of SUBDIRS if used

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SUBDIRS has been kept as a backward compatibility since
commit ("[PATCH] kbuild: external module support") in 2002.

We do not need multiple ways to do the same thing, so I will remove
SUBDIRS after the Linux 5.3 release. I cleaned up in-tree code, and
updated the document so that nobody would try to use it.

Meanwhile, display the following warning if SUBDIRS is used.

Makefile:189: ================= WARNING ================
Makefile:190: 'SUBDIRS' will be removed after Linux 5.3
Makefile:191: Please use 'M=' or 'KBUILD_EXTMOD' instead
Makefile:192: ==========================================

Signed-off-by: Masahiro Yamada <[email protected]>
Acked-by: Boris Brezillon <[email protected]> # for scx200_docflash.c
Acked-by: Guenter Roeck <[email protected]> # for scx200_wdt.c
This commit is contained in:
Masahiro Yamada 2018-11-21 00:04:18 +09:00
commit 0126be38d9
5 changed files with 6 additions and 21 deletions
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4
Makefile
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@ -186,6 +186,10 @@ endif
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
$(warning ================= WARNING ================)
$(warning 'SUBDIRS' will be removed after Linux 5.3)
$(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
$(warning ==========================================)
KBUILD_EXTMOD ?= $(SUBDIRS)
endif