.POSIX:
.SUFFIXES:

VERSION  = 0.1.0
PREFIX   = /usr/local
LIBDIR   = $(PREFIX)/lib
INCDIR   = $(PREFIX)/include

AS       = gcc
CC       = gcc
ASFLAGS  = -Isrc -Wa,--fatal-warnings
CFLAGS   = -std=c11 -O2 -Wall -Wextra -Iinclude
LDLIBS   = -lcurl

BUILD    = build
SRC      = src/util.S src/cep.S src/json.S src/csv.S src/models.S \
           src/http.S src/client.S
OBJ      = $(BUILD)/util.o $(BUILD)/cep.o $(BUILD)/json.o $(BUILD)/csv.o \
           $(BUILD)/models.o $(BUILD)/http.o $(BUILD)/client.o
LIB      = $(BUILD)/libcepis.a
SO       = $(BUILD)/libcepis.so.$(VERSION)
DRIVER   = $(BUILD)/test_cepis
DEMO     = $(BUILD)/cepis-demo

.PHONY: help test lint build check clean format install valgrind asan demo

help:
	@echo 'cepis $(VERSION) - x86-64 assembly client for https://cep.is'
	@echo
	@echo 'targets:'
	@echo '  build     assemble the static and shared libraries'
	@echo '  test      run the suite against a local HTTP server'
	@echo '  valgrind  run the same suite under valgrind'
	@echo '  asan      run the same suite under AddressSanitizer'
	@echo '  lint      read-only checks: assemble with warnings fatal,'
	@echo '            compile the header and driver with -Wall -Wextra,'
	@echo '            reject tabs/trailing whitespace/over-long lines'
	@echo '  check     lint, then test, then build'
	@echo '  demo      build the example command-line client'
	@echo '  clean     remove $(BUILD)'
	@echo '  install   install the library and header under $(PREFIX)'

build: $(LIB) $(SO)

$(BUILD)/util.o: src/util.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/util.S

$(BUILD)/cep.o: src/cep.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/cep.S

$(BUILD)/json.o: src/json.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/json.S

$(BUILD)/csv.o: src/csv.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/csv.S

$(BUILD)/models.o: src/models.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/models.S

$(BUILD)/http.o: src/http.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/http.S

$(BUILD)/client.o: src/client.S src/abi.inc src/defs.inc
	@mkdir -p $(BUILD)
	$(AS) $(ASFLAGS) -c -o $@ src/client.S

$(LIB): $(OBJ)
	@mkdir -p $(BUILD)
	ar rcs $@ $(OBJ)

$(SO): $(OBJ)
	$(CC) -shared -Wl,-soname,libcepis.so.0 -o $@ $(OBJ) $(LDLIBS)

$(DRIVER): tests/test_cepis.c tests/abi_probe.S $(LIB) include/cepis.h
	$(CC) $(CFLAGS) -o $@ tests/test_cepis.c tests/abi_probe.S $(LIB) \
	    $(LDLIBS)

$(BUILD)/test_cepis_asan: tests/test_cepis.c tests/abi_probe.S $(LIB) include/cepis.h
	$(CC) $(CFLAGS) -g -fsanitize=address,undefined -fno-omit-frame-pointer \
	    -o $@ tests/test_cepis.c tests/abi_probe.S $(LIB) $(LDLIBS)

$(DEMO): examples/demo.c $(LIB) include/cepis.h
	$(CC) $(CFLAGS) -o $@ examples/demo.c $(LIB) $(LDLIBS)

demo: $(DEMO)

test: $(DRIVER)
	sh tests/run.sh $(DRIVER)

asan: $(BUILD)/test_cepis_asan
	sh tests/run.sh $(BUILD)/test_cepis_asan

valgrind: $(DRIVER)
	sh tests/run.sh $(DRIVER) valgrind --error-exitcode=9 --leak-check=full \
	    --show-leak-kinds=definite,indirect --errors-for-leak-kinds=definite

lint: $(OBJ) $(DRIVER)
	$(CC) $(CFLAGS) -fsyntax-only -x c include/cepis.h
	sh tools/style.sh

check: lint test build

format:
	@echo 'no formatter for assembly; tools/style.sh is the style check'

clean:
	rm -rf $(BUILD)

install: build
	mkdir -p $(DESTDIR)$(LIBDIR) $(DESTDIR)$(INCDIR)
	cp $(LIB) $(DESTDIR)$(LIBDIR)/libcepis.a
	cp $(SO) $(DESTDIR)$(LIBDIR)/libcepis.so.$(VERSION)
	ln -sf libcepis.so.$(VERSION) $(DESTDIR)$(LIBDIR)/libcepis.so.0
	ln -sf libcepis.so.0 $(DESTDIR)$(LIBDIR)/libcepis.so
	cp include/cepis.h $(DESTDIR)$(INCDIR)/cepis.h