Homebrew Compiling homebrew with make throws error from linker

[JackMacWindows]

I have been working on porting a game I made with a friend to the 3DS. Now I am debug-compiling the port to see how many errors there are. It took me a while to find a makefile, but now when I run make, it throws the error .../armv6k/fpu/3dsx_crt0.o: In function 'ClrLoop'(.crt0+0x8c): undefined reference to 'main'. Here is the makefile:

Spoiler: Makefile

#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------

ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif

TOPDIR ?= $(CURDIR)
include $(DEVKITARM)/3ds_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# DATA is a list of directories containing data files
# INCLUDES is a list of directories containing header files
#
# NO_SMDH: if set to anything, no SMDH file is generated.
# APP_TITLE is the name of the app stored in the SMDH file (Optional)
# APP_DESCRIPTION is the description of the app stored in the SMDH file (Optional)
# APP_AUTHOR is the author of the app stored in the SMDH file (Optional)
# ICON is the filename of the icon (.png), relative to the project folder.
# If not set, it attempts to use one of the following (in this order):
# - <Project name>.png
# - icon.png
# - <libctru folder>/default_icon.png
#---------------------------------------------------------------------------------
TARGET := $(notdir $(CURDIR))
BUILD := build
SOURCES := source
DATA := data
INCLUDES := include

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH := -march=armv6k -mtune=mpcore -mfloat-abi=hard

CFLAGS := -g -Wall -O2 -mword-relocations \
-fomit-frame-pointer -ffast-math \
$(ARCH)

CFLAGS += $(INCLUDE) -DARM11 -D_3DS

CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions -std=gnu++11

ASFLAGS := -g $(ARCH)
LDFLAGS = -specs=3dsx.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)

LIBS := -lctru -lm

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS := $(CTRULIB)


#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT := $(CURDIR)/$(TARGET)
export TOPDIR := $(CURDIR)

export VPATH := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
$(foreach dir,$(DATA),$(CURDIR)/$(dir))

export DEPSDIR := $(CURDIR)/$(BUILD)

CFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
export LD := $(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
export LD := $(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES := $(addsuffix .o,$(BINFILES)) \
$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export INCLUDE := $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
-I$(CURDIR)/$(BUILD)

export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)

ifeq ($(strip $(ICON)),)
icons := $(wildcard *.png)
ifneq (,$(findstring $(TARGET).png,$(icons)))
export APP_ICON := $(TOPDIR)/$(TARGET).png
else
ifneq (,$(findstring icon.png,$(icons)))
export APP_ICON := $(TOPDIR)/icon.png
endif
endif
else
export APP_ICON := $(TOPDIR)/$(ICON)
endif

ifeq ($(strip $(NO_SMDH)),)
export _3DSXFLAGS += --smdh=$(CURDIR)/$(TARGET).smdh
endif

.PHONY: $(BUILD) clean all

#---------------------------------------------------------------------------------
all: $(BUILD)

$(BUILD):
@[ -d $@ ] || mkdir -p $@
@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile

#---------------------------------------------------------------------------------
clean:
@Echo clean ...
@rm -fr $(BUILD) $(TARGET).3dsx $(OUTPUT).smdh $(TARGET).elf


#---------------------------------------------------------------------------------
else

DEPENDS := $(OFILES:.o=.d)

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
ifeq ($(strip $(NO_SMDH)),)
$(OUTPUT).3dsx : $(OUTPUT).elf $(OUTPUT).smdh
else
$(OUTPUT).3dsx : $(OUTPUT).elf
endif

$(OUTPUT).elf : $(OFILES)

#---------------------------------------------------------------------------------
# you need a rule like this for each extension you use as binary data
#---------------------------------------------------------------------------------
%.bin.o : %.bin
#---------------------------------------------------------------------------------
@Echo $(notdir $<)
@$(bin2o)

# WARNING: This is not the right way to do this! TODO: Do it right!
#---------------------------------------------------------------------------------
%.vsh.o : %.vsh
#---------------------------------------------------------------------------------
@Echo $(notdir $<)
@python $(AEMSTRO)/aemstro_as.py $< ../$(notdir $<).shbin
@bin2s ../$(notdir $<).shbin | $(PREFIX)as -o $@
@Echo "extern const u8" `(echo $(notdir $<).shbin | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(notdir $<).shbin | tr . _)`.h
@Echo "extern const u8" `(echo $(notdir $<).shbin | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(notdir $<).shbin | tr . _)`.h
@Echo "extern const u32" `(echo $(notdir $<).shbin | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(notdir $<).shbin | tr . _)`.h
@rm ../$(notdir $<).shbin

-include $(DEPENDS)

#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------

I have OS X, if that matters, with Xcode and devkitPro installed to /opt/devkitPro. What is wrong, and how is it fixed? (If you need the source code to identify the problem, please tell me.)

 

[JackMacWindows]

The 3dsx_crt0.o comes from the 3dsx_crto.s file that is with the standard libctru download. I also tried this on another Mac with no success. I will try Windows...

 

[Rinnegatamante]

The 3dsx_crt0.o comes from the 3dsx_crto.s file that is with the standard libctru download. I also tried this on another Mac with no success. I will try Windows...

Navigate to \devkitPro\devkitARM\arm-none-eabi\lib and launch "make CRT=3dsx" with terminal.

 

[JackMacWindows]

It seems like something happened, but I still get the same error.

Spoiler: Output

make CRT=3dsx
arm-none-eabi-gcc -x assembler-with-cpp -marm -c 3dsx_crt0.s -o3dsx_crt0.o
arm-none-eabi-gcc -x assembler-with-cpp -mthumb -c 3dsx_crt0.s -o thumb/3dsx_crt0.o

 

[Slashcash]

It seems like something happened, but I still get the same error.

Spoiler: Output

make CRT=3dsx
arm-none-eabi-gcc -x assembler-with-cpp -marm -c 3dsx_crt0.s -o3dsx_crt0.o
arm-none-eabi-gcc -x assembler-with-cpp -mthumb -c 3dsx_crt0.s -o thumb/3dsx_crt0.o

Just a random thought: are the c/cpp files in a folder called source? If not: that's the reason

 

[MasterFeizz]

Its not a problem with 3dsx_crt0.o, its a problem with your sources. You haven't defined the main() function, or you are not compiling the file in which its defined.

 

[JackMacWindows]

int main(int argc, char** argv[]) {

Right after the function definitions. Is that the wrong type for argv? It also didn't work without the arguments.

EDIT: I tried somebody else's (int argc, char **argv), but it didn't work either.

 

[MasterFeizz]

int main(int argc, char** argv[]) {

Right after the function definitions. Is that the wrong type for argv? It also didn't work without the arguments.

char** argv[] is wrong.
It should be one of the following

char** argv
char* argv[]

or main could also take no argument

int main(void)

 

[JackMacWindows]

Still not right, error is still occurring.

--------------------- MERGED ---------------------------

Just a random thought: are the c/cpp files in a folder called source? If not: that's the reason

No, they are not in a source folder. And it worked. Thanks!

 

[Slashcash]

No, they are not in a source folder. And it worked. Thanks!

Take a look at this line of the Makefile:

SOURCES := source

The compiler will scan the folder listed after the := symbol for source files. You could add multiple folders by adding paths separated by a space

 

[Zer0Entry]

Just a random thought: are the c/cpp files in a folder called source? If not: that's the reason

What do you mean by "are the c/cpp files in a folder called source?" and how would I do that?