undefined reference to `floor`

[Peng Fan]

hi,

I want to use math function in rtems, and add such a function:
 77 int test(float a)
 78 {
 79     int b= floor(a);
 80     return b;
 81 }
When compiling, it tells 'undefined reference to `floor'
collect2: error: ld returned 1 exit status'

I do not know how to resolve this. I tried to pass `-lm` to gcc, but still
failed to link.

Thanks,
Peng.
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