Automake-style Silent Rules support for GNU Make.

silent_rules.mk

SR_PREFIX ?= SR

# Manual automake silent rule stuff
$(SR_PREFIX)_DEFAULT_VERBOSITY = 0
$(SR_PREFIX)_SILENT_VERBOSITY = -1

V ?= $($(SR_PREFIX)_DEFAULT_VERBOSITY)

SILENT := $(and $(filter $($(SR_PREFIX)_SILENT_VERBOSITY),$(V)),silent)
DEFAULT := $(and $(filter $($(SR_PREFIX)_DEFAULT_VERBOSITY),$(V)),default)
VERBOSE := $(and $(filter-out $($(SR_PREFIX)_SILENT_VERBOSITY) $($(SR_PREFIX)_DEFAULT_VERBOSITY),$(V)),verbose)

VERBOSITY_MODE := $(or $(SILENT),$(DEFAULT),$(VERBOSE))

NOT_SILENT := $(filter-out silent, $(VERBOSITY_MODE))
NOT_DEFAULT := $(filter-out default, $(VERBOSITY_MODE))
NOT_VERBOSE := $(filter-out verbose, $(VERBOSITY_MODE))

define vrule
$(SR_PREFIX)_V_$(1) = $$($(SR_PREFIX)_V_$(1)_$$(V))
$(SR_PREFIX)_V_$(1)_ = $$($(SR_PREFIX)_V_$(1)_$$($(SR_PREFIX)_DEFAULT_VERBOSITY))
$(SR_PREFIX)_V_$(1)_$($(SR_PREFIX)_DEFAULT_VERBOSITY) = @echo $(2);
$(SR_PREFIX)_V_$(1)_$($(SR_PREFIX)_SILENT_VERBOSITY) := @
ifndef $(SR_PREFIX)_V_$(1)_$(V)
    $(SR_PREFIX)_V_$(1)_$(V) :=
endif
endef

# -n prevents echo from printing an empty line.
$(eval $(call vrule,AT,-n))

$(eval $(call vrule,GEN,GEN $$@))