makefile: break out SUB_MAKE and UNSET_VARS

allows adding more flexibility in PRIVATE_DIR private.mk files

Signed-off-by: Øyvind Harboe <[email protected]>

Author: oharboe

flow/Makefile

@@ -509,7 +509,9 @@ else ifneq ($(FOOTPRINT_TCL),)
 IS_CHIP = 1
 endif
 
-UNSET_AND_MAKE = @bash -c 'for var in $(UNSET_VARIABLES_NAMES); do unset $$var; done; $(MAKE) --no-print-directory DESIGN_CONFIG=$(DESIGN_CONFIG) $$@' --
+UNSET_VARS = for var in $(UNSET_VARIABLES_NAMES); do unset $$var; done
+SUB_MAKE = $(MAKE) --no-print-directory DESIGN_CONFIG=$(DESIGN_CONFIG)
+UNSET_AND_MAKE = @bash -c '$(UNSET_VARS); $(SUB_MAKE) $$@' --
 
 # Separate dependency checking and doing a step. This can
 # be useful to retest a stage without having to delete the

flow/util/utils.mk

@@ -86,7 +86,7 @@ define \n
 endef
 
 define get_variables
-$(foreach V, $(.VARIABLES),$(if $(filter-out $(1), $(origin $V)), $(if $(filter-out .% %QT_QPA_PLATFORM% %TIME_CMD% KLAYOUT% GENERATE_ABSTRACT_RULE% do-step% do-copy% OPEN_GUI% OPEN_GUI_SHORTCUT%, $(V)), $V$ )))
+$(foreach V, $(.VARIABLES),$(if $(filter-out $(1), $(origin $V)), $(if $(filter-out .% %QT_QPA_PLATFORM% %TIME_CMD% KLAYOUT% GENERATE_ABSTRACT_RULE% do-step% do-copy% OPEN_GUI% OPEN_GUI_SHORTCUT% SUB_MAKE% UNSET_VARS%, $(V)), $V$ )))
 endef
 
 export UNSET_VARIABLES_NAMES := $(call get_variables,command% line environment% default automatic)