ConfIO

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export CFLAGS CPPFLAGS LDFLAGS LDLIBS DEBUG ASAN O

SRCDIR ?= src
INCDIR ?= include
OBJDIR ?= obj
OUTDIR ?= lib

ifneq ($(DEBUG),y)
    OBJDIR := $(OBJDIR)/release
else
    OBJDIR := $(OBJDIR)/debug
endif
ifeq ($(ASAN),y)
    OBJDIR := $(OBJDIR)_asan
endif
OBJDIR_STATIC := $(OBJDIR)/static
OBJDIR_DYNAMIC := $(OBJDIR)/dynamic

SOURCES := $(wildcard $(SRCDIR)/*.c)
OBJECTS_STATIC := $(patsubst $(SRCDIR)/%.c,$(OBJDIR_STATIC)/%.o,$(SOURCES))
OBJECTS_DYNAMIC := $(patsubst $(SRCDIR)/%.c,$(OBJDIR_DYNAMIC)/%.o,$(SOURCES))

VER_MAJOR := $(shell grep -m 1 '#define CONFIO_VER_MAJOR ' $(INCDIR)/confio/version.h | sed 's/#define .* //')
VER_MINOR := $(shell grep -m 1 '#define CONFIO_VER_MINOR ' $(INCDIR)/confio/version.h | sed 's/#define .* //')
VER_PATCH := $(shell grep -m 1 '#define CONFIO_VER_PATCH ' $(INCDIR)/confio/version.h | sed 's/#define .* //')
VER := $(VER_MAJOR).$(VER_MINOR).$(VER_PATCH)

BIN ?= confio
BIN_STATIC := lib$(BIN).a
BIN_DYNAMIC := lib$(BIN).so

TARGET_STATIC := $(OUTDIR)/$(BIN_STATIC)
TARGET_DYNAMIC := $(OUTDIR)/$(BIN_DYNAMIC).$(VER)

SYSROOT ?= /usr
SYSINC ?= $(SYSROOT)/include
SYSLIB ?= $(SYSROOT)/lib

CC ?= gcc
LD := $(CC)
AR ?= ar
_CC := $(TOOLCHAIN)$(CC)
_LD := $(TOOLCHAIN)$(LD)
_AR := $(TOOLCHAIN)$(AR)

_CFLAGS := $(CFLAGS) -std=c99 -Wall -Wextra -Wuninitialized -Wundef
_CPPFLAGS := $(CPPFLAGS) -I$(INCDIR)
_LDFLAGS := $(LDFLAGS)
_LDLIBS := $(LDLIBS)

ifeq ($(DEBUG),y)
    _CFLAGS += -g -fsanitize=address -fno-omit-frame-pointer -Wdouble-promotion
    #_CFLAGS += -Wconversion
    _LDFLAGS += -fsanitize=address
    O ?= g
else
    _CPPFLAGS += -DNDEBUG
    O ?= 2
endif
_CFLAGS += -O$(O)
ifeq ($(ASAN),y)
    _CFLAGS += -fsanitize=address
    _LDFLAGS += -fsanitize=address
endif

.SECONDEXPANSION:

define mkdir
if [ ! -d '$(1)' ]; then echo 'Creating $(1)/...'; mkdir -p '$(1)'; fi; true
endef
define rm
if [ -f '$(1)' ]; then echo 'Removing $(1)...'; rm -f '$(1)'; fi; true
endef
define rmdir
if [ -d '$(1)' ]; then echo 'Removing $(1)/...'; rm -rf '$(1)'; fi; true
endef

deps.filter := %.c %.h
deps.option := -MM
define deps
$$(filter $$(deps.filter),,$$(shell $(_CC) $(_CFLAGS) $(_CPPFLAGS) -E $(deps.option) $(1)))
endef

build: $(TARGET_STATIC) $(TARGET_DYNAMIC)
	@:

static: $(TARGET_STATIC)
	@:

dynamic: $(TARGET_DYNAMIC)
	@:

$(OUTDIR):
	@$(call mkdir,$@)

$(OBJDIR_STATIC):
	@$(call mkdir,$@)

$(OBJDIR_DYNAMIC):
	@$(call mkdir,$@)

$(OBJDIR_STATIC)/%.o: $(SRCDIR)/%.c $(call deps,$(SRCDIR)/%.c) | $(OBJDIR_STATIC) $(OUTDIR)
	@echo Compiling $<...
	@$(_CC) $(_CFLAGS) $(_CPPFLAGS) $< -c -o $@
	@echo Compiled $<

$(OBJDIR_DYNAMIC)/%.o: $(SRCDIR)/%.c $(call deps,$(SRCDIR)/%.c) | $(OBJDIR_DYNAMIC) $(OUTDIR)
	@echo Compiling $<... '(dynamic)'
	@$(_CC) $(_CFLAGS) -fPIC $(_CPPFLAGS) -DCONFIO_DYNAMIC $< -c -o $@
	@echo Compiled $< '(dynamic)'

$(TARGET_STATIC): $(OBJECTS_STATIC) | $(OUTDIR)
	@echo Creating $@...
	@$(_AR) rcs $@ $^
	@echo Created $@

$(TARGET_DYNAMIC): $(OBJECTS_DYNAMIC) | $(OUTDIR)
	@echo Linking $@...
	@$(_LD) $(_LDFLAGS) -shared $^ $(_LDLIBS) -o $@
	-@cd -- $(OUTDIR) && [ -e $(BIN_DYNAMIC).$(VER_MAJOR) ] || ln -s -- $(BIN_DYNAMIC).$(VER) $(BIN_DYNAMIC).$(VER_MAJOR)
	-@cd -- $(OUTDIR) && [ -e $(BIN_DYNAMIC) ] || ln -s -- $(BIN_DYNAMIC).$(VER_MAJOR) $(BIN_DYNAMIC)
	@echo Linked $@

clean:
	@$(call rmdir,$(OBJDIR))

distclean: clean
	@$(call rm,$(TARGET_STATIC))
	@$(call rm,$(OUTDIR)/$(BIN_DYNAMIC))
	@$(call rm,$(OUTDIR)/$(BIN_DYNAMIC).$(VER_MAJOR))
	@$(call rm,$(TARGET_DYNAMIC))

tests:
	@$(MAKE) -C tests

clean-tests:
	@$(MAKE) -C tests clean

distclean-tests:
	@$(MAKE) -C tests distclean

install:
	@echo Installing headers...
	@cp -r $(INCDIR)/* $(SYSINC)/
	@echo Installing libraries...
	@cp -r $(OUTDIR)/* $(SYSLIB)/
	@echo Done

.PHONY: build static dynamic clean distclean tests clean-tests distclean-tests install