Re: [Gumstix-users] Error In function `__bad_interrupt' when compiling program

[Dave H. <dhy...@gm...>]

Hi Daniel,

On 6/13/07, fo...@it... <fo...@it...> wrote:
> I am trying to compile a program for the robostix with I2C support, and I
> am getting the following error:
>
> +++++++
> [fokumdt@iodine i2c-Sensor]$ make
> Creating svn-version.h ...
> make: Circular i2c-Sensor.elf <- i2c-Sensor dependency dropped.

This warning is significant. It suggests that you somehow have a
circular dependency.

> In function `__bad_interrupt':
> ../../../../crt1/gcrt1.S:123: undefined reference to `main'
> make: *** [i2c-Sensor.elf] Error 1

There is a main function in i2c-io.c.

If you do "make v=1" it will show the complete command line being
used. If you're not linking in i2c-io.c and you're replacing it with
i2c-Sensor.c then it will need to proviode a main function which does
more or less the same stuff that i2c-io.c does.

You can find out whether your file is exporting the main function or
not by running:

avr-nm i2c-Sensor.o

I've done this for i2c-io.o below:

>avr-nm i2c-io.o
         U __do_clear_bss
         U __do_copy_data
0000003e a __SP_H__
0000003d a __SP_L__
0000003f a __SREG__
         U __stack
00000000 a __tmp_reg__
00000090 T __vector_33
00000001 a __zero_reg__
0000000e D gDDR
00000000 D gPIN
0000001c D gPORT
         U gTickCount
         U I2C_SlaveBootHandler
         U I2C_SlaveBootInit
         U I2C_SlaveBootProcessCommand
         U InitHardware
00000000 T main
000000e2 T ProcessCommand

The symbols with numbers beside them are actually defined.

T = public function
t = static function
U = undefined (i.e. a reference to an external function or variable).
D = public variable
d = static variable

As you can see main is listed.

So, do an avr-nm on i2c-Sensor.o and also do the following:

make clean
make v=1

and show us the output. If you want to send me the Makefile, I can
figure out what the circular reference is about.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/