Hi,
the problem is that you use a double function but mspgcc has only float
functions.
It works when you use floats:
#include<math.h>
main()
{
float num = 40.0;
float res;
res = sqrtf(num);
}
> msp430-gcc -O2 -mmcu=msp430x149 -o main.elf main.c -lm
That's because 99 % of the programs do use no floating point code and from the
rest more than 99 %
(.99 %) uses only floats.
That's the reason why no MSP430 compiler has complex numbers (with complex
numbers up to
complex long double and complex NANs, complex infs) although it's in C99 and
although you can use
complex long double numbers on a PC with gcc.
In ANSI-C that's standard conform because mspgcc is a freestanding
implementation.
And because double (and long double, complex long double) operations would be
really slow on
MSP430 and require much Flash they don't make much sense.
Regards,
Rolf
mspgcc-users@lists.sourceforge.net schrieb am 07.07.05 15:21:53:
>
> We had reported a problem on 30 June 2005 regarding
> failing to link math routines in msp430-gcc on Windows
> platform.
>
> We have not been able to get a solution to that
> problem yet.
>
> We subsequently installed msp430-gcc on Linux (FC3)
> platform. We have the same problem that math routines
> don't get linked. Can anyone help?
>
> We are using msp430-gcc ver 3.4.2 on FC3. We could
> complile source code successfully, but could not link
> math library.
>
> ** The source code (main2.c) is below:
>
> #include<msp430x14x.h>
> #include<math.h>
> main()
> {
> double num = 40.0;
> double res;
> res = sqrt(num);
> }
>
> ** The command we tried:
>
> $msp430-gcc -mmcu=msp430x149 -o main main2.c -lm
>
> ** The error message we got:
>
> /tmp/cc4WCY3f.o(.text+0x1c): In function `main':
> undefined reference to `sqrt'
>
> Regards,
> Guruprasad
>
>
>
>
>
>
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