#
# c-ares Makefile for djgpp/gcc/Watt-32.
# Copyright (C) Gisle Vanem <gvanem@yahoo.no>
# SPDX-License-Identifier: MIT
#
include src/lib/Makefile.inc

CSOURCES := $(addprefix src/lib/, $(CSOURCES))
CSOURCES := $(filter-out src/lib/windows_port.c, $(CSOURCES))

VPATH = src/lib src/tools

#
# Root directory for Waterloo tcp/ip.
# WATT_ROOT should be set during Watt-32 install.
#
WATT32_ROOT = $(realpath $(WATT_ROOT))
WATT32_LIB  = $(WATT32_ROOT)/lib/libwatt.a

OBJ_DIR = djgpp

CFLAGS = -g -O2 -I./include -I./src/lib \
         -I$(WATT32_ROOT)/inc -Wall \
         -DWATT32 -DHAVE_CONFIG_H   \
         -Dselect=select_s

LDFLAGS = -s

ifeq ($(OS),Windows_NT)
  #
  # Windows hosted djgpp cross compiler. Get it from:
  #   https://github.com/andrewwutw/build-djgpp/releases
  #
  DJ_PREFIX ?= c:/some-path/djgpp/bin/i586-pc-msdosdjgpp-
  CC = $(DJ_PREFIX)gcc

else
  #
  # The normal djgpp 'gcc' for MSDOS.
  #
  CC = gcc
endif

OBJECTS = $(addprefix $(OBJ_DIR)/, \
            $(notdir $(CSOURCES:.c=.o)))

GENERATED = src/lib/ares_config.h \
            include/ares_build.h

TARGETS = libcares.a adig.exe ahost.exe

.SECONDARY: $(OBJ_DIR)/ares_getopt.o

all: $(OBJ_DIR) $(GENERATED) $(TARGETS)
	@echo Welcome to c-ares.

libcares.a: $(OBJECTS)
	ar rs $@ $(OBJECTS)

src/lib/ares_config.h: src/lib/config-dos.h
	cp --update $< $@

include/ares_build.h: include/ares_build.h.dist
	cp --update $< $@

%.exe: src/tools/%.c $(OBJ_DIR)/ares_getopt.o libcares.a
	$(call compile_and_link, $@, $^ $(WATT32_LIB))

# Clean generated files and objects.
#
clean:
	- rm -f depend.dj $(GENERATED) $(OBJ_DIR)/*.o
	- rmdir $(OBJ_DIR)

# Clean everything
#
realclean vclean: clean
	- rm -f $(TARGETS) $(TARGETS:.exe=.map)

$(OBJ_DIR):
	- mkdir $@

$(OBJ_DIR)/%.o: %.c
	$(CC) $(CFLAGS) -o $@ -c $<
	@echo

define compile_and_link
  $(CC) -o $(1) $(CFLAGS) $(LDFLAGS) -Wl,--print-map,--sort-common $(2) > $(1:.exe=.map)
  @echo
endef

DEP_REPLACE = sed -e 's@\(.*\)\.o: @\n$$(OBJ_DIR)\/\1.o: @' \
                  -e 's@$(WATT32_ROOT)@$$(WATT32_ROOT)@g'

#
# One may have to do 'make -f Makefile.dj clean' first in case
# a foreign 'curl_config.h' is making trouble.
#
depend: $(GENERATED) Makefile.dj
	$(CC) -MM $(CFLAGS) $(CSOURCES) | $(DEP_REPLACE) > depend.dj

-include depend.dj