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#
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# File: BuildEnvironment.mk
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# Copyright (c) 2019, Dornerworks Ltd.
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#
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BUILD_DIR = ./build
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CROSS_COMPILE_PREFIX = riscv32-unknown-elf
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SDK_DIR = ./freedom-e-sdk
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LINKER_SCRIPT = $(SDK_DIR)/env/freedom-e300-hifive1/flash.lds
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#-----------------------------------------------------------
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GCC = $(CROSS_COMPILE_PREFIX)-gcc
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OBJCOPY = $(CROSS_COMPILE_PREFIX)-objcopy
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OBJDUMP = $(CROSS_COMPILE_PREFIX)-objdump
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AR = $(CROSS_COMPILE_PREFIX)-ar
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RANLIB = $(CROSS_COMPILE_PREFIX)-ranlib
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GDB = $(CROSS_COMPILE_PREFIX)-gdb
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# if using the multi-arch (riscv64-unknown-elf-gcc):
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ARCH_FLAGS = -march=rv32imac -mabi=ilp32 -mcmodel=medany
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# Basic CFLAGS:
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CFLAGS = -Wall -Wextra -O0 -g3 -msmall-data-limit=8 -std=gnu11
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CFLAGS += -ffunction-sections -fdata-sections -fno-builtin-printf
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CFLAGS += -DDONT_USE_PLIC -DDONT_USE_M_TIME
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CFLAGS += -include sys/cdefs.h
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CFLAGS += $(ARCH_FLAGS)
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# These flags are for outputing *.d dependency files for make
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CFLAGS += -MT"$@" -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@)"
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ASMFLAGS = -O0 -g3
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ASMFLAGS += $(ARCH_FLAGS)
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ASMFLAGS += -DportasmHANDLE_INTERRUPT=handle_trap
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ASMFLAGS += -msmall-data-limit=8
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ASMFLAGS += -ffunction-sections -fdata-sections
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ASMFLAGS += -x assembler-with-cpp
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ASMFLAGS += -MT"$@" -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@)"
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# Linker arguments __________________________________________
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LDFLAGS := -Xlinker --gc-sections -Xlinker --defsym=__stack_size=1K
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LDFLAGS += -O0 -g3
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LDFLAGS += -ffunction-sections -fdata-sections --specs=nano.specs
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LDFLAGS += -nostartfiles
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LDFLAGS += -T $(LINKER_SCRIPT)
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LDFLAGS += -L../
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LDFLAGS += -Wl,--start-group -Wl,--end-group
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LDFLAGS += -Wl,--wrap=malloc -Wl,--wrap=free -Wl,--wrap=open -Wl,--wrap=lseek -Wl,--wrap=read -Wl,--wrap=write
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LDFLAGS += -Wl,--wrap=fstat -Wl,--wrap=stat -Wl,--wrap=close -Wl,--wrap=link -Wl,--wrap=unlink -Wl,--wrap=execve
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LDFLAGS += -Wl,--wrap=fork -Wl,--wrap=getpid -Wl,--wrap=kill -Wl,--wrap=wait -Wl,--wrap=isatty -Wl,--wrap=times
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LDFLAGS += -Wl,--wrap=sbrk -Wl,--wrap=_exit -Wl,--wrap=puts -Wl,--wrap=_malloc -Wl,--wrap=_free -Wl,--wrap=_open
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LDFLAGS += -Wl,--wrap=_lseek -Wl,--wrap=_read -Wl,--wrap=_write -Wl,--wrap=_fstat -Wl,--wrap=_stat -Wl,--wrap=_close
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LDFLAGS += -Wl,--wrap=_link -Wl,--wrap=_unlink -Wl,--wrap=_execve -Wl,--wrap=_fork -Wl,--wrap=_getpid -Wl,--wrap=_kill
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LDFLAGS += -Wl,--wrap=_wait -Wl,--wrap=_isatty -Wl,--wrap=_times -Wl,--wrap=_sbrk -Wl,--wrap=__exit -Wl,--wrap=_puts
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