# SPDX-License-Identifier: GPL-2.0-only
.SUFFIXES:
MAKEFLAGS += -Rr
ifeq ("$(origin CC)", "default")
        CC := cc
endif
ifeq ("$(origin V)", "command line")
	SAY =
else
	SAY = @echo '$(strip $(1))'
endif

PACKAGE := micoforia
DEFINES = \
	$(call DEFINE,PACKAGE,$(PACKAGE)) \
	$(call DEFINE,AUTHOR,Andre Noll) \
	$(call DEFINE,COPYRIGHT_YEAR,2019) \
	$(call DEFINE,SLOGAN,Minimal Containers for Instant Access) \
	$(call DEFINE,EMAIL,maan@tuebingen.mpg.de) \
	$(call DEFINE,URL,https://people.tuebingen.mpg.de/maan/$(PACKAGE)/) \
	$(call DEFINE,CLONE_URL,https://git.tuebingen.mpg.de/$(PACKAGE)) \
	$(call DEFINE,GITWEB_URL,https://git.tuebingen.mpg.de/$(PACKAGE).git) \
	$(call DEFINE,HOME_URL,https://people.tuebingen.mpg.de/maan/) \
	$(call DEFINE,LICENSE,GNU GPL version 3) \
	$(call DEFINE,LICENSE_URL,https://www.gnu.org/licenses/gpl-3.0-standalone.html)
DEFINE = -D$(1)='"$(2)"'
# LOGLEVELS is special because it is defined unquoted
LOGLEVELS := LL_DEBUG,LL_INFO,LL_NOTICE,LL_WARNING,LL_ERROR,LL_CRIT,LL_EMERG
CPP_DEFINES := $(DEFINES) -DLOGLEVELS='$(LOGLEVELS)'
DEFINE = -D "$(1)=$(2)"
M4_DEFINES := $(DEFINES)

.ONESHELL:
.SHELLFLAGS := -ec
PREFIX ?= /usr/local
INSTALL ?= install
MKDIR_P := mkdir -p
RM := rm -f
CHMOD := chmod
B := build
all := micoforia micoforia.8
all: $(all)
www := $(B)/index.html
www: $(www)

units := micoforia util version micoforia.lsg
deps := $(addprefix $(B)/, $(addsuffix .d, $(units)))
objs := $(addprefix $(B)/, $(addsuffix .o, $(units)))

ifeq ($(findstring clean, $(MAKECMDGOALS)),)
-include $(deps)
-include $(B)/config.mak
endif

M4 += $(M4_DEFINES) defs.m4

XCPPFLAGS := $(CPP_DEFINES) -I$(B) -Wunused-macros

XCFLAGS :=
XCFLAGS += -fno-strict-aliasing
XCFLAGS += -g
XCFLAGS += -Os
XCFLAGS += -Wundef -W -Wuninitialized
XCFLAGS += -Wchar-subscripts
XCFLAGS += -Werror-implicit-function-declaration
XCFLAGS += -Wmissing-noreturn
XCFLAGS += -Wbad-function-cast
XCFLAGS += -Wredundant-decls
XCFLAGS += -Wno-sign-compare -Wno-unknown-pragmas
XCFLAGS += -Wdeclaration-after-statement
XCFLAGS += -Wformat -Wformat-security -Wmissing-format-attribute
XCFLAGS += -fsanitize=undefined
XCFLAGS += -fdata-sections -ffunction-sections
XCFLAGS += -Wstrict-prototypes
XCFLAGS += -Wshadow
XCFLAGS += -Wunused -Wall
XCFLAGS += -Wformat-signedness
XCFLAGS += -Wdiscarded-qualifiers

XLDFLAGS := -lubsan -Wl,--gc-sections
version_file := $(B)/version.c
GIT_VERSION := $(shell $(MKDIR_P) $(B) && ./version-gen.sh $(PACKAGE) $(version_file))

CC_CMD = $(CC) -c -o $@ $(XCPPFLAGS) $(CPPFLAGS) \
	$(XCFLAGS) $(CFLAGS) -MMD -MP -MF $(B)/$(*F).d -MT $@

$(objs): m7a.h $(B)/micoforia.lsg.h

$(B):
	@$(MKDIR_P) $@

$(B)/config.h.in: configure.ac | $(B)
	$(call SAY, AH $<)
	cd $(B)
	autoheader -f ../configure.ac
$(B)/configure.sh: configure.ac | $(B)
	$(call SAY, AC $<)
	cd $(B)
	autoconf ../configure.ac > configure.sh
	$(CHMOD) 755 configure.sh
$(B)/config.status: $(B)/configure.sh | $(B)
	$(call SAY, SH $<)
	cd $(B)
	if test -x config.status; then \
		./config.status --quiet --recheck; \
	else \
		./configure.sh --no-create; \
	fi
$(B)/config.mak $(B)/config.h: $(B)/config.status config.mak.in $(B)/config.h.in
	$(call SAY, CS $@)
	cd $(B)
	ln -f ../config.mak.in
	./config.status -q
	test -f config.h && touch config.h

$(B)/index.html $(B)/micoforia.suite: $(B)/%: %.m4 Makefile $(B)/config.mak
	$(call SAY, M4 $<)
	$(M4) $< > $@
$(B)/%.lsg.c: $(B)/%.suite
	$(call SAY, LSGC $<)
	$(LOPSUBGEN) --gen-c --output-dir $(B) < $<
$(B)/%.lsg.h: $(B)/%.suite
	$(call SAY, LSGH $<)
	$(LOPSUBGEN) --gen-header --output-dir $(B) < $<
%.8: $(B)/%.suite $(B)/version.c
	$(call SAY, LSGM $<)
	$(LOPSUBGEN) --gen-man=$(*F).8 --version-string $(GIT_VERSION) < $<

$(B)/%.o: %.c | $(B)
	$(call SAY, CC $<)
	$(CC_CMD) $<
$(B)/%.o: $(B)/%.c
	$(call SAY, CC $<)
	$(CC_CMD) $<
micoforia: $(objs)
	$(call SAY, LD $@)
	$(CC) -o $@ $^ $(XLDFLAGS) $(LDFLAGS) -llopsub -lmnl -lutil -lcap

mandir := $(datarootdir)/man/man8
INSTALL ?= install
INSTALL_PROGRAM ?= $(INSTALL) -m 755
INSTALL_DATA ?= $(INSTALL) -m 644
ifneq ($(findstring strip, $(MAKECMDGOALS)),)
	strip_option := -s
endif
install install-strip: all
	$(MKDIR_P) $(DESTDIR)$(sbindir) $(DESTDIR)$(mandir)
	$(INSTALL_PROGRAM) $(strip_option) micoforia $(DESTDIR)$(sbindir)
	$(INSTALL_DATA) micoforia.8 $(DESTDIR)$(mandir)

clean:
	$(RM) $(B)/*.o $(all) $(www)
distclean: clean
	$(RM) -r $(B)
maintainer-clean:
	git clean -dfqx > /dev/null 2>&1

README: README.m4 Makefile $(B)/config.mak
	@$(M4) $<

.PRECIOUS: $(B)/%.lsg.c $(B)/%.lsg.h $(B)/%.8
.PHONY: all www clean install distclean maintainer-clean README
-include Makefile.local