Is the error regarding r2dintcall something like as shown below?
Error: unknown operand r2dintcall#__umulsi3hwpopr2
That seemed to be a compiler build problem... from the quick google
search I did.
Something about incorrect CR/LF settings in cygwin.. not sure entirely.
It might pay to examine the map file to see whether sin and sqrt are
actually present.
I'm not sure if the linker is smart enough to exclude them if they're
not actually reference, but it's worth a look anyway.
Bevan
I understand. Thank you. I didn't know that about printf.
As for sin and sqrt, yes I've compiled with -lm, and included math.h.
That's why I can't see what the problem could be.
And I don't know what r2dintcall is.
Thanks,
Oszkar
*Bevan Weiss <[email protected]>*
Sent by: [email protected]
07/18/2007 01:20 PM
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Re: [Mspgcc-users] undefined reference to ... ?
I'll have a go at this, though I'm sure Grant or Steve will also throw
in on the matter with much more authoritative answers.
printf relies on putchar to actually write the character string out to
the UART. printf doesn't know which UART you want it to be directed to,
so it just directly reference putchar and expects you to provide putchar
to output them.
If you've setup a simple polled serial port driver then it should be as
simple as having
void putchar(int c)
{ uart_tx(c);
}
or something like that. I can't remember if putchar is defined with an
int argument or just a char. Experimentation would tell you
As for sqrt, are you linking in the math library? -lm
The same might apply to sin, though I might actually be wrong on both of
these.
I believe the math functions also require you to compile against the
math header file math.h..
Bevan
>
> Hi,
>
> I keep getting these error messages: "undefined reference to ...."
> When I try to use printf, it's undefined reference to putchar.
> When I use sqrt, it's undefined reference to sqrt.
> When I use sin, it's undefined reference to r2dintcall (???).
>
> Is there a solution, or is this normal? (can't imagine it to be)
>
>
> Thanks,
> Oszkar
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