Current kbuild will build the target again if we run "make M=dir" and "make
M=dir/" by turns, since if_changed will see the prerequisite is changed.
The behavior may confuse the user a little, since actually we are building
the same target and no difference.
According to current implementation in scripts/Makefile.build, the obj
passed to next level is a directory name with last slash stripped. This
patch strips the last slash in KBUILD_EXTMOD which is assigned from "M=".
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
---
Makefile | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index b1037774e8e8..db6ed60928ab 100644
--- a/Makefile
+++ b/Makefile
@@ -184,13 +184,15 @@ endif
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
- KBUILD_EXTMOD ?= $(SUBDIRS)
+ __KBUILD_EXTMOD ?= $(SUBDIRS)
endif
ifeq ("$(origin M)", "command line")
- KBUILD_EXTMOD := $(M)
+ __KBUILD_EXTMOD := $(M)
endif
+KBUILD_EXTMOD = $(patsubst %/,%,$(__KBUILD_EXTMOD))
+
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
--
2.11.0
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