Experimental Physics and
Industrial Control System

Bonnie Madre <[email protected]> · Fri, 10 Apr 1998 10:15:17 EDT

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

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System