MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
SERENITY_BASE_DIR := $(patsubst %/,%,$(dir $(MAKEFILE_PATH)))

CXX_STANDARD_FLAGS = -std=c++2a
CXX_WARNING_FLAGS = -Werror -Wextra -Wall -Wno-nonnull-compare -Wno-deprecated-copy -Wno-address-of-packed-member -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough -Wno-expansion-to-defined
CXX_FLAVOR_FLAGS = -fno-exceptions -fno-rtti -fstack-protector
#CXX_SUGGEST_FLAGS = -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override #-Wsuggest-attribute=noreturn 

C_STANDARD_FLAGS =
C_WARNING_FLAGS = -Werror -Wextra -Wall -Wno-nonnull-compare -Wno-address-of-packed-member -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough -Wno-expansion-to-defined
C_FLAVOR_FLAGS = -fstack-protector

ARCH_FLAGS =
OPTIMIZATION_FLAGS = -Os

INCLUDE_FLAGS += \
    -I. \
    -I$(SERENITY_BASE_DIR)/DevTools \
    -I$(SERENITY_BASE_DIR) \
    -I$(SERENITY_BASE_DIR)/Libraries \
    -I$(SERENITY_BASE_DIR)/Servers

VERBOSE = 0

UNAME_S := $(shell uname -s)

ifneq ($(USE_HOST_CXX),)
    ifeq ($(UNAME_S),OpenBSD)
        HOST_CXX ?= clang++
    endif

    ifeq '' '$(findstring clang++,$(CXX))'
        C_WARNING_FLAGS += -Wno-unknown-warning-option
        CXX_WARNING_FLAGS += -Wno-unknown-warning-option
    endif
    ifeq ($(HOST_CXX),)
        CXX = $(PRE_CXX) c++
    else
        CXX = $(HOST_CXX)
    endif
    AS = as
    LINK = ld
    OBJ_SUFFIX ?= .host
    ARCH = $(shell arch -s)
else
    ifeq ($(UNAME_S),SerenityOS)
        TOOLCHAIN_PREFIX =
    else
        TOOLCHAIN_PATH = $(SERENITY_BASE_DIR)/Toolchain/Local/bin
        TOOLCHAIN_PREFIX = $(TOOLCHAIN_PATH)/i686-pc-serenity-
    endif

    CXX = $(PRE_CXX) $(TOOLCHAIN_PREFIX)g++
    CC = $(PRE_CC) $(TOOLCHAIN_PREFIX)gcc
    AS = $(TOOLCHAIN_PREFIX)as
    LINK = $(TOOLCHAIN_PREFIX)ld
    RANLIB = $(TOOLCHAIN_PREFIX)ranlib
    AR = $(TOOLCHAIN_PREFIX)ar
    ARCH = i386

    DEFINES += -DDEBUG

    INCLUDE_FLAGS += \
    	-I$(SERENITY_BASE_DIR)/Libraries/LibC \
    	-I$(SERENITY_BASE_DIR)/Libraries/LibM \
    	-I$(SERENITY_BASE_DIR)/Libraries/LibPthread

    ifdef KERNEL
        DEFINES += -DKERNEL
    else ifdef BOOTSTRAPPER
        DEFINES += -DBOOTSTRAPPER
    else
        # everything else gets -lc -lm
        LIB_DEPS := C M $(LIB_DEPS)
    endif

    # turn "LIB_DEPS=C Core Thread" into "-lc -lcore -lthread -L.../LibC ..."
    LDFLAGS += $(foreach lib,$(LIB_DEPS),\
        -l$(shell echo $(lib) | tr A-Z a-z))
    LDFLAGS += $(foreach lib,$(LIB_DEPS),\
        -L$(SERENITY_BASE_DIR)/Libraries/Lib$(lib))

    STATIC_LIB_DEPS = $(foreach lib,$(LIB_DEPS),\
        $(SERENITY_BASE_DIR)/Libraries/Lib$(lib)/lib$(shell echo $(lib) | tr A-Z a-z).a)

    OBJ_SUFFIX ?=
endif

#CXX = clang $(CLANG_FLAGS)
#CLANG_FLAGS = -Wconsumed -m32 -ffreestanding -march=i686

CXXFLAGS = -MMD -MP $(CXX_WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(CXX_FLAVOR_FLAGS) $(ARCH_FLAGS) $(CXX_STANDARD_FLAGS) $(CXX_SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES) $(SUBPROJECT_CXXFLAGS)
CFLAGS = -MMD -MP $(C_FLAVOR_FLAGS) $(ARCH_FLAGS) $(C_STANDARD_FLAGS) $(C_SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES) $(SUBPROJECT_CXXFLAGS)

DEFINES += -DSANITIZE_PTRS

SUFFIXED_OBJS = $(patsubst %.o,%$(OBJ_SUFFIX).o,$(OBJS))

ifeq ($(VERBOSE),1)
    QUIET =
else
    QUIET = @
endif

-include $(SUFFIXED_OBJS:%.o=%.d)

.SUFFIXES:

%$(OBJ_SUFFIX).o: %.cpp $(EXTRA_SOURCES)
	@echo "$(notdir $(CURDIR)): C++ $@"
	$(QUIET) $(CXX) $(CXXFLAGS) -o $@ -c $<

%$(OBJ_SUFFIX).o: %.c
	@echo "$(notdir $(CURDIR)): C $@"
	$(QUIET) $(CC) $(CFLAGS) -o $@ -c $<

%.ao: %.S
	@echo "$(notdir $(CURDIR)): AS $@"
	$(QUIET) $(AS) -o $@ $<

$(PROGRAM): $(STATIC_LIB_DEPS) $(SUFFIXED_OBJS) $(EXTRA_OBJS)
	@echo "$(notdir $(CURDIR)): LINK $(PROGRAM)"
	$(QUIET) $(CXX) -o $(PROGRAM) $(EXTRA_OBJS) $(SUFFIXED_OBJS) $(LDFLAGS)

$(LIBRARY): $(SUFFIXED_OBJS) $(EXTRA_OBJS)
	@echo "$(notdir $(CURDIR)): LIB $@"
	$(QUIET) $(AR) rcs $@ $(OBJS) $(EXTRA_OBJS) $(LIBS)
	$(POST_LIBRARY_BUILD)

#.PHONY: $(STATIC_LIB_DEPS)
$(STATIC_LIB_DEPS):
	@flock $(dir $(@)) $(MAKE) -C $(dir $(@))

IPCCOMPILER = $(SERENITY_BASE_DIR)/DevTools/IPCCompiler/IPCCompiler
IPCCOMPILER: $(IPCCOMPILER)
$(IPCCOMPILER):
	@flock $(dir $(@)) $(MAKE) -C $(dir $(@))

FORMCOMPILER = $(SERENITY_BASE_DIR)/DevTools/FormCompiler/FormCompiler
FORMCOMPILER: $(FORMCOMPILER)
$(FORMCOMPILER):
	@flock $(dir $(@)) $(MAKE) -C $(dir $(@))

.DEFAULT_GOAL := all

all: $(PROGRAM) $(LIBRARY)

EXTRA_CLEAN ?=

clean:
	@echo "$(notdir $(CURDIR)): CLEAN"
	$(QUIET) rm -f $(PROGRAM) $(LIBRARY) $(SUFFIXED_OBJS) $(EXTRA_OBJS) $(patsubst %.o,%.d,$(SUFFIXED_OBJS) $(EXTRA_OBJS)) $(EXTRA_CLEAN)

install:

.DELETE_ON_ERROR:

.PHONY: all clean install