#Build architecture/variant string, possible values: x86, armv7le, etc...
PLATFORM ?= PSX

#Build profile, possible values: release, debug, profile, coverage
BUILD_DIR     ?= bin
BUILD_PROFILE ?= debug

CONFIG_NAME ?= $(PLATFORM)-$(BUILD_PROFILE)
OUTPUT_DIR   = $(BUILD_DIR)/$(CONFIG_NAME)
TARGET       = $(OUTPUT_DIR)/$(ARTIFACT)

#Compiler definitions
HAS_LINUX_MIPS_GCC = $(shell which mipsel-linux-gnu-gcc > /dev/null 2> /dev/null && echo true || echo false)
ifeq ($(HAS_LINUX_MIPS_GCC),true)
PREFIX ?= mipsel-linux-gnu
FORMAT ?= elf32-tradlittlemips
else
PREFIX ?= mipsel-none-elf
FORMAT ?= elf32-littlemips
endif

CC  = $(PREFIX)-gcc-10
CXX = $(PREFIX)-g++-10
LD  = $(CXX)
AR  = ar

#architecture flags
ARCHFLAGS  = -march=mips1 -mabi=32 -EL -fno-pic -mno-shared -mno-abicalls -mfp32
ARCHFLAGS += -fno-stack-protector -nostdlib -ffreestanding

#Compiler flags for build profiles
CCFLAGS_release += -O3
CCFLAGS_debug   += -O0

CXXFLAGS += -fno-exceptions -fno-rtti

USE_FUNCTION_SECTIONS ?= true
ifeq ($(USE_FUNCTION_SECTIONS),true)
CCFLAGS_all += -ffunction-sections
endif
CCFLAGS_all += -mno-gpopt -fomit-frame-pointer
CCFLAGS_all += -fno-builtin -fno-strict-aliasing -Wno-attributes
CCFLAGS_all += $(ARCHFLAGS)

CCFLAGS_all += $(CCFLAGS_$(BUILD_PROFILE))

#Linker flags
LDFLAGS_release += -Os

LDFLAGS_all += -Wl,-Map=$(TARGET).map -nostdlib -T$(LDSCRIPT) -static -Wl,--gc-sections -Wl,--build-id=none
LDFLAGS_all += $(ARCHFLAGS) -Wl,--oformat=$(FORMAT)
LDFLAGS_all += $(LDFLAGS_$(BUILD_PROFILE))

LIBS_all    += $(LIBS_$(BUILD_PROFILE))

DEPS = -Wp,-MMD,$(@:%.o=%.d),-MT,$@

#Object files list
OBJS = $(addprefix $(OUTPUT_DIR)/,$(addsuffix .o, $(subst ..,!super,$(basename $(SRCS)))))

#Compiling rule
$(OUTPUT_DIR)/%.o: %.c
	@mkdir -p $(dir $@)
	$(CC) -c $(DEPS) -o $@ $(CCFLAGS_all) $(CCFLAGS) $<

$(OUTPUT_DIR)/%.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) -c $(DEPS) -o $@ $(CCFLAGS_all) $(CXXFLAGS) $<

.SECONDEXPANSION:
$(OUTPUT_DIR)/%.o: $$(subst !super,..,%.s)
	@mkdir -p $(dir $@)
	$(CC) $(ARCHFLAGS) -I$(PCSX_REDUX) -g -c -o $@ $<

#Linking rule
$(TARGET).a: $(OBJS)
	@mkdir -p $(dir $@)
	$(AR) rcs $(TARGET).a $(OBJS)


$(TARGET).elf: $(OBJS)
	$(LD) -o $(TARGET).elf $(LDFLAGS_all) $(LDFLAGS) $(OBJS) $(LIBS_all) $(LIBS)

#Strips the psexe
$(TARGET).psexe: $(TARGET).elf
	$(PREFIX)-objcopy $(addprefix -R , $(OVERLAYSECTION)) -O binary $< $@

#Rules section for default compilation and linking
rebuild: 
	$(MAKE) clean 
	$(MAKE) all

#Inclusion of dependencies (object files to source and includes)
-include $(OBJS:%.o=%.d)