mod.am.description = Support for Automake variables (systemd specific)
mod.am.depends += gnuconf

am.inst2noinst_DATA = $(notdir \
        $(patsubst $(sysusersdir)/%.conf,%.sysusers,\
        $(patsubst $(sysctldir)/%.conf,%.sysctl,\
        $1)))
am.var_PROGRAMS    = $1_SOURCES nodist_$1_SOURCES $1_CFLAGS $1_CPPFLAGS $1_LDFLAGS $1_LDADD
am.var_LTLIBRARIES = $1_SOURCES nodist_$1_SOURCES $1_CFLAGS $1_CPPFLAGS $1_LDFLAGS $1_LIBADD

am.INSTALL_PROGRAM   ?= $(INSTALL_PROGRAM) $< $@
am.INSTALL_SCRIPT    ?= $(INSTALL) $< $@
am.INSTALL_LTLIBRARY ?= $(INSTALL) $< $@
am.INSTALL_DATA      ?= $(INSTALL_DATA) $< $@

########################################################################

# this list of primaries is based on the Automake 1.15 manual
am.primaries ?= PROGRAMS LIBRARIES LTLIBRARIES LISP PYTHON JAVA SCRIPTS DATA HEADERS MANS TEXINFOS
$(eval $(foreach p,$(am.primaries),am.inst2noinst_$p ?= $$(notdir $$1)$(at.nl)))

am.primary2dirs = $(filter $(patsubst %dir,%,$(filter %dir,$(.VARIABLES))),\
                           $(patsubst %_$1,%,$(filter %_$1,$(.VARIABLES))))
am.inst2dirs = $(sort $(dir $(foreach p,$(am.primaries),$(am.inst_$p))))

am.file2var = $(subst -,_,$(subst .,_,$1))
am.file2sources  = $(addprefix $(srcdir)/,$(notdir $($(am.file2var)_SOURCES)))
am.file2sources += $(addprefix $(outdir)/,$(notdir $(nodist_$(am.file2var)_SOURCES)))
am.file2.o  = $(patsubst $(srcdir)/%,$(outdir)/%,$(patsubst %.c,%.o ,$(filter %.c,$(am.file2sources))))
am.file2.lo = $(patsubst %.o,%.lo,$(am.file2.o))
am.file2lib = $(foreach l,   $($(am.file2var)_$2),$(if $(filter lib%.la,$l), $($(l:.la=).DEPENDS)  , $l ))
am.file2cpp = $(foreach l,$1 $($(am.file2var)_$2),$(if $(filter lib%.la,$l), $($(l:.la=).CPPFLAGS) ,    ))

define _am.per_primary
noinst_$1 ?=
check_$1 ?=

am.inst_$1 := $$(foreach d,$$(call am.primary2dirs,$1),$$($$d_$1))
am.noinst_$1 := $$(noinst_$1)
am.check_$1 := $$(check_$1)
$(foreach d,$(call am.primary2dirs,$1) noinst check,undefine $d_$1$(at.nl))
ifneq ($$(am.inst_$1),)
$$(am.inst_$1): private am.INSTALL = $$(am.INSTALL_$1)
endif
am.$1 = $$(am.check_$1) $$(am.noinst_$1) $$(call am.inst2noinst_$1,$$(am.inst_$1))
endef
########################################################################
# TODO: I'm not in love with how _am.per_PROGRAM figures out am.subdirs
# $1 = filename
# $2 = varname
define _am.per_PROGRAM
$(foreach var,_am.depends $(call am.var_PROGRAMS,$2),$(var) ?=$(at.nl))
_am.depends += $$(call at.path,$$(call am.file2.o,$1)  $$(call am.file2lib,$1,LDADD))
am.CPPFLAGS +=                 $$($2_CPPFLAGS)         $$(call am.file2cpp,$1,LDADD)
am.CFLAGS   +=                 $$($2_CFLAGS)
$$(outdir)/$1: private ALL_LDFLAGS += $$($2_LDFLAGS)
$$(outdir)/$1: $$(_am.depends)
am.subdirs := $$(sort $$(am.subdirs)\
                      $$(filter-out $$(abspath $$(srcdir)),\
                                    $$(abspath $$(dir $$(filter-out -l% /%,$$(_am.depends))))))
am.CPPFLAGS := $$(am.CPPFLAGS)
am.CFLAGS := $$(am.CFLAGS)
$(foreach var,_am.depends $(call am.var_LTLIBRARIES,$2),undefine $(var)$(at.nl))
endef
########################################################################
# TODO: I'm not in love with how _am.per_LTLIBRARY figures out am.subdirs
# $1 = filename
# $2 = varname
define _am.per_LTLIBRARY
$(foreach var,_am.depends $(call am.var_LTLIBRARIES,$2),$(var) ?=$(at.nl))
_am.depends += $$(call at.path,$$(call am.file2.lo,$1) $$(call am.file2lib,$1,LIBADD))
am.CPPFLAGS +=                 $$($2_CPPFLAGS)         $$(call am.file2cpp,$1,LIBADD)
am.CFLAGS   +=                 $$($2_CFLAGS)
$$(outdir)/$1: private ALL_LDFLAGS += $$($2_LDFLAGS)
$$(outdir)/$1: $$(_am.depends)
am.subdirs := $$(sort $$(am.subdirs)\
                      $$(filter-out $$(abspath $$(srcdir)),\
                                    $$(abspath $$(dir $$(filter-out -l% /%,$$(_am.depends))))))
am.CPPFLAGS := $$(am.CPPFLAGS)
am.CFLAGS := $$(am.CFLAGS)
$(foreach var,_am.depends $(call am.var_LTLIBRARIES,$2),undefine $(var)$(at.nl))
endef
########################################################################
define _am.per_directory
$$(DESTDIR)$1/%: $$(outdir)/%
	@$$(NORMAL_INSTALL)
	$$(am.INSTALL)
$$(DESTDIR)$1/%: $$(srcdir)/%
	@$$(NORMAL_INSTALL)
	$$(am.INSTALL)
endef