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authorMasahiro Yamada <yamada.m@jp.panasonic.com>2014-09-09 20:02:24 +0900
committerMichal Marek <mmarek@suse.cz>2014-10-01 22:44:21 +0200
commitaa55c8e2f7a395dfc9e67fc6637321e19ce9bfe1 (patch)
tree23fc4ca0d100904325701042b95ec406802e7daa /Makefile
parent745a254322c898dadf019342cd7140f7867d2d0f (diff)
downloadlinux-aa55c8e2f7a395dfc9e67fc6637321e19ce9bfe1.tar.gz
kbuild: handle C=... and M=... after entering into build directory
This commit avoids processing C=... and M=... twice when O=... is also given. Besides, we can also remove KBUILD_EXTMOD="$(KBUILD_EXTMOD)" in the sub-make target. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Acked-by: Peter Foley <pefoley2@pefoley.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile60
1 files changed, 29 insertions, 31 deletions
diff --git a/Makefile b/Makefile
index edc1269ee24..36723905368 100644
--- a/Makefile
+++ b/Makefile
@@ -95,34 +95,6 @@ endif
export quiet Q KBUILD_VERBOSE
-# Call a source code checker (by default, "sparse") as part of the
-# C compilation.
-#
-# Use 'make C=1' to enable checking of only re-compiled files.
-# Use 'make C=2' to enable checking of *all* source files, regardless
-# of whether they are re-compiled or not.
-#
-# See the file "Documentation/sparse.txt" for more details, including
-# where to get the "sparse" utility.
-
-ifeq ("$(origin C)", "command line")
- KBUILD_CHECKSRC = $(C)
-endif
-ifndef KBUILD_CHECKSRC
- KBUILD_CHECKSRC = 0
-endif
-
-# Use make M=dir to specify directory of external module to build
-# Old syntax make ... SUBDIRS=$PWD is still supported
-# Setting the environment variable KBUILD_EXTMOD take precedence
-ifdef SUBDIRS
- KBUILD_EXTMOD ?= $(SUBDIRS)
-endif
-
-ifeq ("$(origin M)", "command line")
- KBUILD_EXTMOD := $(M)
-endif
-
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
@@ -138,7 +110,6 @@ endif
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.
-
# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)
@@ -172,8 +143,7 @@ $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
sub-make: FORCE
$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
- KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
- $(filter-out _all sub-make,$(MAKECMDGOALS))
+ -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
# Leave processing to above invocation of make
skip-makefile := 1
@@ -188,6 +158,34 @@ ifeq ($(skip-makefile),)
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory
+# Call a source code checker (by default, "sparse") as part of the
+# C compilation.
+#
+# Use 'make C=1' to enable checking of only re-compiled files.
+# Use 'make C=2' to enable checking of *all* source files, regardless
+# of whether they are re-compiled or not.
+#
+# See the file "Documentation/sparse.txt" for more details, including
+# where to get the "sparse" utility.
+
+ifeq ("$(origin C)", "command line")
+ KBUILD_CHECKSRC = $(C)
+endif
+ifndef KBUILD_CHECKSRC
+ KBUILD_CHECKSRC = 0
+endif
+
+# Use make M=dir to specify directory of external module to build
+# Old syntax make ... SUBDIRS=$PWD is still supported
+# Setting the environment variable KBUILD_EXTMOD take precedence
+ifdef SUBDIRS
+ KBUILD_EXTMOD ?= $(SUBDIRS)
+endif
+
+ifeq ("$(origin M)", "command line")
+ KBUILD_EXTMOD := $(M)
+endif
+
# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all