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Beginners > Undefined Main

#92966 - Azenris - Sun Jul 16, 2006 2:44 am

I looked at this thread http://forum.gbadev.org/viewtopic.php?t=9652&highlight=compile+errors But i couldn't work out how it was fixed.

Could I have an explanation or Link to a similar thread please.

Im using the template MakeFile

Code:


#---------------------------------------------------------------------------------
# Clear the implicit built in rules
#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------
ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM)
endif

include $(DEVKITARM)/gba_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output, if this ends with _mb a multiboot image is generated
# 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
#---------------------------------------------------------------------------------
TARGET      :=   $(shell basename $(CURDIR))
BUILD      :=   build
SOURCES      :=   source
DATA      :=   
INCLUDES   :=

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH   :=   -mthumb -mthumb-interwork

CFLAGS   :=   -g -Wall -O3\
      -mcpu=arm7tdmi -mtune=arm7tdmi\
       -fomit-frame-pointer\
      -ffast-math \
      $(ARCH)

CFLAGS   +=   $(INCLUDE)

CXXFLAGS   :=   $(CFLAGS) -fno-rtti -fno-exceptions -fno-rtti -fnoexceptions

ASFLAGS   :=   $(ARCH)
LDFLAGS   =   -g $(ARCH) -Wl,-Map,$(notdir $@).map,-specs=gba.specs

#---------------------------------------------------------------------------------
# path to tools - this can be deleted if you set the path to the toolchain in windows
#---------------------------------------------------------------------------------
export PATH   :=   $(DEVKITARM)/bin:$(PATH)

#---------------------------------------------------------------------------------
# any extra libraries we wish to link with the project
#---------------------------------------------------------------------------------
LIBS   :=   -lgba

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

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

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

#---------------------------------------------------------------------------------
# automatically build a list of object files for our project
#---------------------------------------------------------------------------------
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)

#---------------------------------------------------------------------------------
# build a list of include paths
#---------------------------------------------------------------------------------
export INCLUDE   :=   $(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
         $(foreach dir,$(LIBDIRS),-I$(dir)/include) \
         -I$(CURDIR)/$(BUILD)

#---------------------------------------------------------------------------------
# build a list of library paths
#---------------------------------------------------------------------------------
export LIBPATHS   :=   $(foreach dir,$(LIBDIRS),-L$(dir)/lib)

.PHONY: $(BUILD) clean

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

all   : $(BUILD)
#---------------------------------------------------------------------------------
clean:
   @echo clean ...
   @rm -fr $(BUILD) $(TARGET).elf $(TARGET).gba

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

DEPENDS   :=   $(OFILES:.o=.d)

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(OUTPUT).gba   :   $(OUTPUT).elf

$(OUTPUT).elf   :   $(OFILES)

-include $(DEPENDS)

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


I tried adding the -specs=gba.specs (though im not sure the purpose of it) Not Sure I even need this.

When I run this makefile I get an output of

Code:

C:\Documents and Settings\Azenris>cd C:\Att2
C:\Att2>make
linking cartridge
c:\devkitpro\devkitarm\arm-eabi\bin\ld.real.exe: warning: cannot find entry symb
ol cs=gba.specs; defaulting to 08000234
c:/devkitpro/devkitarm/bin/../lib/gcc/arm-eabi/4.1.1/../../../../arm-eabi/lib/th
umb/gba_crt0.o: In function `start_vector':
gba_crt0.s:(.init+0x224): undefined reference to `main'
collect2: ld returned 1 exit status
make[1]: *** [/c/Att2/Att2.elf] Error 1
make: *** [build] Error 2
C:\Att2>


Without the gba.specs thingy its
Code:

C:\Att2>make
linking cartridge
c:/devkitpro/devkitarm/bin/../lib/gcc/arm-eabi/4.1.1/../../../../arm-eabi/lib/th
umb/gba_crt0.o: In function `start_vector':
gba_crt0.s:(.init+0x224): undefined reference to `main'
collect2: ld returned 1 exit status
make[1]: *** [/c/Att2/Att2.elf] Error 1
make: *** [build] Error 2

C:\Att2>


It do not have a function called AgbMain()

I also found in another thread about renaming ld.real.exe etc etc, that didnt work so I changed it back.

Anyway, if you could help I'll spend everyday trying to answer other peoples problems ! :p[/code]

#94423 - wintermute - Mon Jul 24, 2006 8:27 pm

copy the gba template folder found in the gba examples. Place your source files in the source folder. At the very least you need

Code:

// main.c
int main() {
  while(1);
}


This will do nothing but it will link.
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#94611 - sgeos - Tue Jul 25, 2006 2:38 pm

I have fussy coding standards. Use this instead. It should compile anywhere without warnings:
Code:
int main(void)
{
  while (1)
  {
    /" do nothing "/
  }
  return 0;
}


-Brendan

#94614 - wintermute - Tue Jul 25, 2006 2:51 pm

If you're going to claim fussy coding standards it's probably worth writing code that *will* compile :P
_________________
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devkitPro IRC support
Personal Blog

#94624 - sgeos - Tue Jul 25, 2006 3:15 pm

Darn Korean keyboard. =) Found splat. =P
Code:
int main(void)
{
  while (1)
  {
    /* do nothing */
  }
  return 0;
}


-Brendan