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Subject[PATCH 07/11] kbuild: unset variables in top Makefile instead of setting 0
Date
There is no need to set 0 to variables such as config-targets,
mixed-targets, etc.

Unset instead of setting 0 in order to use 'ifdef' to test them.

I also renamed:

config-targets -> config-build
mixed-targets -> mixed-build
dot-config -> need-config

to clarify what we are doing.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Makefile | 46 +++++++++++++++++++++++-----------------------
1 file changed, 23 insertions(+), 23 deletions(-)

diff --git a/Makefile b/Makefile
index 3c186f59f152..706ca0d633df 100644
--- a/Makefile
+++ b/Makefile
@@ -272,32 +272,32 @@ no-dot-config-targets := $(clean-targets) \
no-sync-config-targets := $(no-dot-config-targets) install %install \
kernelrelease

-config-targets := 0
-mixed-targets := 0
-dot-config := 1
-may-sync-config := 1
+config-build :=
+mixed-build :=
+need-config := 1
+may-sync-config := 1

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
- dot-config := 0
+ need-config :=
endif
endif

ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
- may-sync-config := 0
+ may-sync-config :=
endif
endif

ifneq ($(KBUILD_EXTMOD),)
- may-sync-config := 0
+ may-sync-config :=
endif

ifeq ($(KBUILD_EXTMOD),)
ifneq ($(filter config %config,$(MAKECMDGOALS)),)
- config-targets := 1
+ config-build := 1
ifneq ($(words $(MAKECMDGOALS)),1)
- mixed-targets := 1
+ mixed-build := 1
endif
endif
endif
@@ -305,18 +305,18 @@ endif
# For "make -j clean all", "make -j mrproper defconfig all", etc.
ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
- mixed-targets := 1
+ mixed-build := 1
endif
endif

# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
- mixed-targets := 1
+ mixed-build := 1
endif
endif

-ifeq ($(mixed-targets),1)
+ifdef mixed-build
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.
@@ -332,7 +332,7 @@ __build_one_by_one:
$(MAKE) -f $(srctree)/Makefile $$i; \
done

-else
+else # !mixed-build

include scripts/Kbuild.include

@@ -544,7 +544,7 @@ endif
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)

-ifeq ($(config-targets),1)
+ifdef config-build
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target
@@ -561,7 +561,7 @@ config: scripts_basic outputmakefile FORCE
%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@

-else
+else #!config-build
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.
@@ -604,7 +604,7 @@ endif

export KBUILD_MODULES KBUILD_BUILTIN

-ifeq ($(dot-config),1)
+ifdef need-config
include include/config/auto.conf
endif

@@ -652,8 +652,8 @@ ARCH_AFLAGS :=
ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile

-ifeq ($(dot-config),1)
-ifeq ($(may-sync-config),1)
+ifdef need-config
+ifdef may-sync-config
# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
# because some architectures define CROSS_COMPILE there.
@@ -676,7 +676,7 @@ $(KCONFIG_CONFIG):
# The syncconfig should be executed only once to make all the targets.
%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
-else
+else # !may-sync-config
# External modules and some install targets need include/generated/autoconf.h
# and include/config/auto.conf but do not care if they are up-to-date.
# Use auto.conf to trigger the test
@@ -692,7 +692,7 @@ include/config/auto.conf:
/bin/false)

endif # may-sync-config
-endif # $(dot-config)
+endif # need-config

KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
@@ -1809,9 +1809,9 @@ existing-targets := $(wildcard $(sort $(targets)))

-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)

-endif # ifeq ($(config-targets),1)
-endif # ifeq ($(mixed-targets),1)
-endif # need-sub-make
+endif # config-targets
+endif # mixed-build
+endif # need-sub-make

PHONY += FORCE
FORCE:
--
2.17.1
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