# Copyright © Tavian Barnes <tavianator@tavianator.com>
# SPDX-License-Identifier: 0BSD

# Makefile fragment that implements `make config`

include config/prelude.mk
include config/exports.mk

# All configuration steps
config: ${CONFIG} ${GEN}/config.h
.PHONY: config

# Makefile fragments generated by `make config`
MKS := \
    ${GEN}/vars.mk \
    ${GEN}/flags.mk \
    ${GEN}/deps.mk \
    ${GEN}/pkgs.mk

# The main configuration file, which includes the others
${CONFIG}: ${MKS}
	${MSG} "[ GEN] ${TGT}"
	@printf '# %s\n' "${TGT}" >$@
	@printf 'include $${GEN}/%s\n' ${MKS:${GEN}/%=%} >>$@
	${VCAT} ${CONFIG}
.PHONY: ${CONFIG}

# Saves the configurable variables
${GEN}/vars.mk::
	@${MKDIR} ${@D}
	${MSG} "[ GEN] ${TGT}"
	@printf '# %s\n' "${TGT}" >$@
	@printf 'PREFIX := %s\n' "$$XPREFIX" >>$@
	@printf 'MANDIR := %s\n' "$$XMANDIR" >>$@
	@printf 'OS := %s\n' "$${OS:-$$(uname)}" >>$@
	@printf 'CC := %s\n' "$$XCC" >>$@
	@printf 'INSTALL := %s\n' "$$XINSTALL" >>$@
	@printf 'MKDIR := %s\n' "$$XMKDIR" >>$@
	@printf 'PKG_CONFIG := %s\n' "$$XPKG_CONFIG" >>$@
	@printf 'RM := %s\n' "$$XRM" >>$@
	@printf 'PKGS :=\n' >>$@
	${VCAT} $@

# Sets the build flags.  This depends on vars.mk and uses a recursive make so
# that the default flags can depend on variables like ${OS}.
${GEN}/flags.mk: ${GEN}/vars.mk
	@+${MAKE} -sf config/flags.mk $@
.PHONY: ${GEN}/flags.mk

# Check for dependency generation support
${GEN}/deps.mk: ${GEN}/flags.mk
	@+${MAKE} -sf config/deps.mk $@
.PHONY: ${GEN}/deps.mk

# Auto-detect dependencies and their build flags
${GEN}/pkgs.mk: ${GEN}/flags.mk
	@+${MAKE} -sf config/pkgs.mk $@
.PHONY: ${GEN}/pkgs.mk

# Compile-time feature detection
${GEN}/config.h: ${CONFIG}
	@+${MAKE} -sf config/header.mk $@
.PHONY: ${GEN}/config.h