Question to math.h

Reinhard

Sorry if I have a new question

During the port of the NMEA Lib I get problems with __isnan( double) from math.h

so I tried to reduce the problem to this snippet

#include <math.h>
// math.h ->  int __isnan(double);

// propeller-elf-gcc -mlmm  -o isnan_test.elf  isnan_test.c -lm

void main ()
{
    double x;
    
    if(__isnan(x))
    {
        ;
    }

}

and get linker error :
\myC\propeller_chip\gcc\isnan>propeller-elf-gcc -mlmm -o isnan_test.elf isnan_test.c -lm
C:\DOKUME~1\Reinhard\LOKALE~1\Temp\cckHbArR.o: In function `_main':
(.text+0x2c): undefined reference to `___isnan'
collect2: ld returned 1 exit status

I have no problem to compile and link this snippet with dev-cpp

best Regards
Reinhard

ersmith

Thank you for the bug report. That appears to be a build issue with our math library.

We're working on a fix. You can work around it for now by using GCC's __builtin_isnan() in place of __isnan() or isnan(), e.g. by adding

#if defined(__propeller__)
#define __isnan(x) __builtin_isnan(x)
#endif

after the include of math.h.

Eric