CODEWITHSUNDEEP
c++gccmakefile
AnonBird
AnonBird

Reputation: 656

What difference between my compilation line and my makefile could cause the error?

I have previously write a compilation line which is working. Howewer, my Makefile, which generates more or less the same thing, isn't successfully compiling.

Command line (working) :

sh3eb-elf-gcc -m3 -mb -ffreestanding -nostdlib -T addin.ld src/crt0.s src/BTKOM.cpp src/bluetooth.cpp src/syscall.s -o addin.elf -Iinclude -L libs/ -lgcc -lmonochrome -lfx -O2 -fno-exceptions

Makefile :

CC = sh3eb-elf-gcc
SRCDIR = src
INCLDIR = include
LIBDIR = libs
EXTENSIONS = c cpp s
LIBS = -lgcc -lmonochrome -lfx
WFLAGS = -Wall
CFLAGS = -I $(INCLDIR) $(WFLAGS)
LFLAGS = -m3 -mb -ffreestanding -nostdlib -T addin.ld -L $(LIBDIR) $(LIBS) -O2 -fno-exceptions
SRCS := $(SRCS) $(foreach EXT,$(EXTENSIONS),$(wildcard $(SRCDIR)/*.$(EXT)))
OBJS := $(OBJS) $(foreach EXT,$(EXTENSIONS),$(patsubst $(SRCDIR)/%.$(EXT),%.o,$(wildcard $(SRCDIR)/*.$(EXT))))
OUT = addin

all : $(OUT).elf

$(OUT).elf : $(OBJS)
    $(CC) $(LFLAGS) -o $@ $^

$(OBJS) : $(SRCDIR)/$(SRCS)
    $(CC) $(CFLAGS) -c $(SRCS)

clean:
    rm -f *.o

cleaner:
    rm -f *.o $(OUT).elf $(OUT).g1a $(OUT).bin

Generated lines from makefile :

sh3eb-elf-gcc -I include -Wall -c  src/MonochromeLib.c src/BTKOM.cpp src/bluetooth.cpp src/syscall.s src/crt0.s
sh3eb-elf-gcc -m3 -mb -ffreestanding -nostdlib -T addin.ld -L libs -lgcc -lmonochrome -lfx -O2 -fno-exceptions -o addin.elf MonochromeLib.o BTKOM.o bluetooth.o syscall.o crt0.o

Output :

BTKOM.o: In function `_main':
BTKOM.cpp:(.text+0xc4): undefined reference to `_memset'
BTKOM.cpp:(.text+0xec): undefined reference to `_GetKey'
bluetooth.o: In function `Bluetooth::Bluetooth()':
bluetooth.cpp:(.text+0xa0): undefined reference to `_srand'
bluetooth.cpp:(.text+0xa4): undefined reference to `_rand'
bluetooth.cpp:(.text+0xac): undefined reference to `_memcpy'
...

Upvotes: 1

Views: 91

Answers (1)

user657267
user657267

Reputation: 21020

There's a reason the built-in linking rule is defined as

$(LINK.o) $^ $(LOADLIBES) $(LDLIBS) -o $@

LINK.o is

$(CC) $(LDFLAGS) $(TARGET_ARCH)

You should find it works by rewriting your makefile as 

LDLIBS  := -lgcc -lmonochrome -lfx
LDFLAGS := -nostdlib -T addin.ld -L libs

$(OUT).elf: $(OBJS)
    $(LINK.o) $^ $(LDLIBS) -o $@

Note that -O2, ffreestanding and -fno-exceptions are compilation options, not linking options (and I think -m3 and -mb are as well).

Upvotes: 2

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