FYI...

[Bonnie Madre <madre@cebaf.gov>]

> --- Begin Message ---
> For anyone who hasn't yet built EPICS on Linux 5.0, I found the problem 
> with many of the error messages I reported when trying to build the
> extensions, a few days ago. The answer was in the glibc FAQ (Thanks to 
> my supervisor for directing me to it):
>
> "_GNU_SOURCE:  glibc does not make the GNU extensions available 
> automatically.  If a program depends on the GNU extensions or some other
> non-standard functionality, it is necessary to compile it with the C 
> compiler option -D_GNU_SOURCE, or better to put #define _GNU_SOURCE at
> the beginning of your source files, before any C library header files 
> are included.  This difference normally manifests itself in the form
> of missing prototypes and/or data type definitions.  Thus, if you get
> such errors, the first thing you should do is try defining _GNU_SOURCE
> and see if that makes the problem go away."
>
> In most cases, it does.
>
> Many of you who have been working with Linux a long time, probably  knew
> this, but for those whose experience is as limited as mine, I figured
> I'd post this, and maybe it will help someone.
>
> --
> Bonnie Madre 
> Accelerator Development
> Integration and Assessment Group
>
> ANALOG ADDRESS:
> Thomas Jefferson National Accelerator Facility (TJNAF)
> MS 58
> 12000 Jefferson Avenue
> Newport News, VA  23606
> (757) 269-7059
>
> E-MAIL ADDRESS:
> madre@jlab.org
>
>
> --- End Message ---