Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Fri, 9 Sep 2011 17:22:45 -0500

Hi Jeff,

On 2011-09-08 Jeff Hill wrote:
> Agree with Eric that it may very well be OS specific, and even OS version
> specific, whether the OS headers provide their own conditional blocks for
> C++ specifying extern "C", or not. It seems odd that it's that way for all
> OS. Could also simply have been a mistake, or a bad assumption at the time
> that it was written. I'm not sure what the standard says about nested
>  extern "C" blocks?

I'm guessing it used to be necessary on some OS, and that osdSock.h file got 
copied to the other OSs.  I just committed the changes to delete these — I 
tested it on many but not all so it's possible I might have broken something 
which we can fix later if it comes up.

The problem with nesting extern "C" blocks is that the target has no way to 
know if it's inside one, and even if you can say extern "C++" nobody does.

- Andrew
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System