tools/kconfig: add kconfiglib support

Reference:
https://github.com/ulfalizer/Kconfiglib

Setup:
pip install kconfiglib

Signed-off-by: chao an <anchao@xiaomi.com>

Author: anchao

tools/Unix.mk

@@ -605,44 +605,74 @@ pass2dep: context tools/mkdeps$(HOSTEXEEXT) tools/cnvwindeps$(HOSTEXEEXT)
 KCONFIG_ENV  = APPSDIR=${CONFIG_APPS_DIR} EXTERNALDIR=$(EXTERNALDIR)
 KCONFIG_ENV += APPSBINDIR=${CONFIG_APPS_DIR} BINDIR=${TOPDIR}
 
+KCONFIG_LIB = $(shell command -v menuconfig 2> /dev/null)
+
+# Prefer "kconfiglib" if host OS supports it
+
+ifeq ($(KCONFIG_LIB),)
+  KCONFIG_OLDCONFIG     = kconfig-conf --oldconfig Kconfig
+  KCONFIG_OLDDEFCONFIG  = kconfig-conf --olddefconfig Kconfig
+  KCONFIG_MENUCONFIG    = kconfig-mconf Kconfig
+  KCONFIG_NCONFIG       = kconfig-nconf Kconfig
+  KCONFIG_QCONFIG       = kconfig-qconf Kconfig
+  KCONFIG_GCONFIG       = kconfig-gconf Kconfig
+  KCONFIG_SAVEDEFCONFIG = kconfig-conf Kconfig --savedefconfig
+define kconfig_tweak_disable
+	kconfig-tweak --file $1 -u $2
+endef
+else
+  KCONFIG_OLDCONFIG     = oldconfig
+  KCONFIG_OLDDEFCONFIG  = olddefconfig
+  KCONFIG_MENUCONFIG    = menuconfig
+  KCONFIG_NCONFIG       = guiconfig
+  KCONFIG_QCONFIG       = ${KCONFIG_NCONFIG}
+  KCONFIG_GCONFIG       = ${KCONFIG_NCONFIG}
+  KCONFIG_SAVEDEFCONFIG = savedefconfig --out
+define kconfig_tweak_disable
+	sed -i '/$2/d' $1
+endef
+endif
+
+KCONFIG_CONF = kconfig-conf
+
 config:
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-conf Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_CONF}
 
 oldconfig:
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-conf --oldconfig Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_OLDCONFIG}
 
 olddefconfig:
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-conf --olddefconfig Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_OLDDEFCONFIG}
 
 menuconfig:
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-mconf Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_MENUCONFIG}
 
 nconfig: apps_preconfig
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-nconf Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_NCONFIG}
 
 qconfig: apps_preconfig
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-qconf Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_QCONFIG}
 
 gconfig: apps_preconfig
 	$(Q) $(MAKE) clean_context
 	$(Q) $(MAKE) apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-gconf Kconfig
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_GCONFIG}
 
 savedefconfig: apps_preconfig
-	$(Q) ${KCONFIG_ENV} kconfig-conf --savedefconfig defconfig.tmp Kconfig
-	$(Q) kconfig-tweak --file defconfig.tmp -u CONFIG_APPS_DIR
+	$(Q) ${KCONFIG_ENV} ${KCONFIG_SAVEDEFCONFIG} defconfig.tmp
+	$(Q) $(call kconfig_tweak_disable,defconfig.tmp,CONFIG_APPS_DIR)
 	$(Q) grep "CONFIG_ARCH=" .config >> defconfig.tmp
 	$(Q) grep "^CONFIG_ARCH_CHIP_" .config >> defconfig.tmp; true
 	$(Q) grep "CONFIG_ARCH_CHIP=" .config >> defconfig.tmp; true