Hi,
On Wed, Jul 19, 2000 at 04:03:26PM +0800, �⺮ wrote:
> I am programing a real-time application based on rtlinux1.1.
>
> I failed in using some fp functions such as asin(),sqrt() in my rt module.
> I named the source file nc_module.c, and I tried to link the math library like this:
>
> nc_module_tmp.o: nc_module.c
> $(CC) ${INCLUDE} ${CFLAGS} -c -o nc_module_tmp.o nc_module.c
> nc_module.o: nc_module_tmp.o
> ld -r -static -o nc_module.o nc_module_tmp.o -L/usr/lib -lm
>
> In fact, I just imitated a example application, I donot exactly know why I can not
>simply do like this:
>
> nc_module.o: nc_module.c
> $(CC) ${INCLUDE} ${CFLAGS} -c -o nc_module_tmp.o nc_module.c-lm
>
Using -c flag, you say "don't do linking."
> when I insmoded the nc_module.o, errors happened:
>
> ./nc_module.o: unresolved symbol __isnan
> ./nc_module.o: unresolved symbol __isnan
> ...
The trouble is, __isnan is defined in libc, _not_ in libm. The source
name is s_isnan.c. Get it + includes and add it to your sources, it
should work. Drop me a line if more help needed.
Regards,
pa
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Pavel Andris | tel: +421 7 5941 2167
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