supress silence quiet Makefile warning: overriding commands for target warning: ignoring old commands for target

include.mk

# Makefile utility for including other Makefiles only once

# Function that includes a Makefile if it hasn't been included before
#
# Usage:
#   $(call include_makefile_once, <filename>)
#
#   where <filename> is the name of the Makefile to include
define include_makefile_once
ifeq ($(filter %$(1),$(MAKEFILE_LIST)),)
	include $(1)
endif
endef

# Macro that includes multiple Makefiles only once
#
# Usage:
#   $(call include_makefiles_once, <filenames>)
#
#   where <filenames> is a space-separated list of filenames to include
#
# Example:
#   $(call include_makefiles_once, git.mk otherlib.mk thirdlib.mk)
#
# This will include the Makefiles git.mk, otherlib.mk, and thirdlib.mk
# only once each, if they exist.
define include_makefiles_once
	$(foreach FILE,$(1),$(eval $(call include_makefile_once,$(FILE))))
endef

Makefile

include lib/include.mk
MAKEFILES_INCLUDES = help.mk print.mk git.mk
$(call include_makefiles_once,$(MAKEFILES_INCLUDES))