Re: [gpsd-dev] ✘gpsd is now C99, really.

[Hal Murray]

On Raspbian:

./libgpsd.a(libgpsd_core.o): In function `gpsd_poll':
libgpsd_core.c:(.text+0x2200): undefined reference to `isfinite'
libgpsd_core.c:(.text+0x2220): undefined reference to `isfinite'
libgpsd_core.c:(.text+0x223c): undefined reference to `isfinite'
libgpsd_core.c:(.text+0x2290): undefined reference to `isfinite'
collect2: error: ld returned 1 exit status
scons: *** [gpsd] Error 1

libgpsd_core.c: In function 'gpsd_error_model':
libgpsd_core.c:933:2: warning: implicit declaration of function 'isfinite' 
[-Wimplicit-function-declaration]
  if (isnan(fix->epx) != 0 && isfinite(session->gpsdata.dop.hdop) != 0)
  ^
libgpsd_core.c: In function 'gpsd_await_data':
libgpsd_core.c:1036:5: warning: implicit declaration of function 'pselect' 
[-Wimplicit-function-declaration]
     status = pselect(maxfd + 1, rfds, NULL, NULL, NULL, NULL);
     ^
man page says:
       fpclassify(), isfinite(), isnormal():
           _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
           _POSIX_C_SOURCE >= 200112L;
           or cc -std=c99

--------

On Fedora 24:

libgpsd_core.c: In function 'gpsd_await_data':
libgpsd_core.c:1036:14: warning: implicit declaration of function 'pselect' 
[-Wimplicit-function-declaration]
     status = pselect(maxfd + 1, rfds, NULL, NULL, NULL, NULL);

Man page says:
       pselect(): _POSIX_C_SOURCE >= 200112L


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