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make: Ensure main object file is first

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Per the SDCC manual, the object that declares main must be passed first
to the linker. The resulting binary is identical, and this has not
caused a problem yet, so I'm unsure how "required" this is.

Ref: Section 3.2.3 Projects with Multiple Source Files
Signed-off-by: Tim Crawford <tcrawford@system76.com>
This commit is contained in:
Tim Crawford
2023-01-11 09:21:57 -07:00
committed by Tim Crawford
parent 7ebec4f7b1
commit f46360fb45
1 changed files with 6 additions and 1 deletions
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7
src/arch/8051/toolchain.mk
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@ -5,6 +5,11 @@ CC = sdcc -mmcs51 --model-large --code-size $(CODE_SIZE) --xram-size $(SRAM_SIZE
AS = sdas8051
ASFLAGS = -plosgff
# XXX: SDCC "requires" main() to be in the first item passed to the linker.
# Ref: SDCC Manual 4.2.8; Section 3.2.3 Projects with Multiple Source Files
MAIN_SRC = $(filter %/main.c, $(SRC))
MAIN_OBJ = $(sort $(patsubst src/%.c, $(BUILD)/%.rel, $(MAIN_SRC)))
# NOTE: sdas *must* be used for assembly files as sdcc cannot compile them
# itself. They must use an extension of `.asm` so they can be filtered here.
@ -14,7 +19,7 @@ ASM_OBJ = $(sort $(patsubst src/%.asm, $(BUILD)/%.rel, $(ASM_SRC)))
C_SRC = $(filter %.c, $(SRC))
C_OBJ = $(sort $(patsubst src/%.c, $(BUILD)/%.rel, $(C_SRC)))
OBJ = $(sort $(ASM_OBJ) $(C_OBJ))
OBJ = $(MAIN_OBJ) $(sort $(ASM_OBJ) $(C_OBJ))
# Run EC rom in simulator
sim: $(BUILD)/ec.rom