Experimental Physics and
Industrial Control System

Relevant feature macros defined for our 3.14.12 build (unchanged I think)

> -D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500 -D_BSD_SOURCE

From the linux manpage on isfinite()

> fpclassify(), isfinite(), isnormal():
>            _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
>            or cc -std=c99

These conditions are not met.

I'd certainly support modernizing in any of these three areas (POSIX,
XOPEN, or even C99), but I'm sure this will draw the usual complains
from vx55 users (and MS users for C99).


On 07/22/2014 05:45 AM, Ralph Lange wrote:
> All,
> 
> Working on a patch for Base I am having trouble trying to use isfinite() 
> on Linux (gcc 4.9.0) - isinf() and isnan() work fine, but isfinite() 
> gets me an "implicit declaration" warning and a missing symbol when linking.
> 
> Any ideas? All these macros should be POSIX and defined in math.h, right?
> 
> Thanks a lot,
> ~Ralph
> 

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isfinite() on Linux Ralph Lange

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