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O := build
src := $(abspath .)
obj = $(O)/$(rule_top)/$(rule_target)-$(build_id)
build_id = $(call per_target,build_id)
build_vars = $(foreach var,$(1),$(call add_build_var,$(var))$(newline))
add_build_var = \
$(call target_var,build_id_text) += $$(let val,$$($(1)),$$(if $$(val),$(1)="$$(strip $$(val))"))
build_makefiles := $(wildcard mk/*.mk)
$(build_makefiles):
build_makefiles += Makefile
build_stack :=
define enter_build
build_stack += $$(rule_target);$$(rule_top)
rule_top := $(1)
rule_target := $(if $(2),$(2),$(target))
$$(call target_var,build_id_text) =
endef
define exit_build
last_build := $$(lastword $$(build_stack))
build_stack := $$(filter-out $$(last_build),$$(build_stack))
last_build := $$(subst ;,$(space),$$(last_build))
rule_top := $$(lastword $$(last_build))
rule_target := $$(firstword $$(last_build))
endef
define setup_obj
export build_id_text := $$(strip $$(call per_target,build_id_text))
$$(call target_var,build_id) := $$(shell echo -n "$$$$build_id_text" | sha1sum | head -c8)
unexport build_id_text
$$(obj): export CONTENTS := $$(build_id_text)
$$(obj):
@mkdir -p $$@ && echo -n "$$$$CONTENTS" >$$@/build-vars
endef
define find_command_lazy
$(2)_cmdline := $$($(2))
override $(call defer,$(2),$$(call find_command,$(1),$(2)))
endef
define find_command
override $(2) := $$($(2)_cmdline)
ifeq (,$$($(2)))
override $(2) := $(1)
endif
which_out := $$(shell which $$($(2)) 2>/dev/null)
ifneq (0,$$(.SHELLSTATUS))
which_out :=
endif
ifeq (,$$(which_out))
$$(error $(1) ($$($2)) not found)
endif
endef
shell_defer = $(call defer,$(1),$(1) := $$(call shell_checked,$(2)))
shell_checked = $(shell $(1))$(if $(filter-out 0,$(.SHELLSTATUS)),$(error Command failed: $(1)))
define find_with_pkgconfig
pkgs := $(strip $(1))
ifneq (,$$(pkgs))
ifeq (undefined,$$(origin pkgconfig_cflags/$$(pkgs)))
$$(eval $$(run_pkgconfig))
endif
$(2) += $$(pkgconfig_cflags/$$(pkgs))
$(3) += $$(pkgconfig_libs/$$(pkgs))
endif
endef
define run_pkgconfig
pkgconfig_cflags/$$(pkgs) := $$(shell $$(PKG_CONFIG) --cflags $$(pkgs))
ifeq (0,$$(.SHELLSTATUS))
pkgconfig_libs/$$(pkgs) := $$(shell $$(PKG_CONFIG) --libs $$(pkgs))
endif
ifneq (0,$$(.SHELLSTATUS))
$$(error pkg-config failed for package list: $$(pkgs))
endif
endef
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