Experimental Physics and
Industrial Control System

Jeff Hill <[email protected]> · Fri, 08 Nov 1996 14:11:39 -0700

Nick Rees wrote:

3.13 and c++:

> 
> We don't use c++ much at all here so the latest releases are testing
> us... 
> I would dearly like someone to clarify all this because now it is
> impossible to compile base without a c++ compiler of some sort or
> other.

It is possible to build the 3.13 system without a C++ compiler if you
comment out the C++ codes in base/src/libCom/Makefile.Unix and you
comment out the "cas" and "gdd" lines in CONFIG_BASE. This is the
default in beta4 as I recall. You will of course be unable to use the 
ca server library and the data descriptor library.

> We don't have the c++ compiler from Sun and so are forced to use
> g++, and we are finding it has a problem with variable argument lists.
> 

Which version of g++ are you using? To find out type "g++ -v".
I frequently compile all of EPICS including Jim's gdd library 
with gcc/g++ 2.7.2 here at LANL. I suspect that gcc/g++ 2.6.x would 
also work but have not used this version for 9 months or so.

I have been using the GNU compilers on sunos4.
I just finished trying out the GNU build on solaris and it is unable to
compile the log server - something to do with the structures
for SIGHUP. I wil look into it and get back to you.

> 
> I did ask once which c++ compilers were to be supported but got no
> reply - I also know Jeff said at one point that he managed to compile
> base with gcc and g++, but I don't know whether it still does.
> How does all this
> effect our support for other hosts (Linux, HP etc?).
> 

We are attempting to write portable code. We have not tested all of the
compilers but certainly will be interested in reintegrating any
changes required to get the code to compile on other systems.

Any system that uses GNU compilers such as Linux should not 
present problems. HPUX needs to be investigated. 

> How
> about the situation that I have - is using Solaris c (because nominally
> we only support the vendor supplied C compilers) with GNU g++
> supported, or is there a library problem sometimes? 

It is possible to call sunPro compiled C code from gcc compiled code. 
I suspect that it would also be possible to call sunPro compiled C code 
from g++. I have not tried this combination (I will later this afternoon). 
It is impossible to call sunPro C++ code from g++ compiled C++ 
code because of C++ symbol name mangling.

Jeff

-- 
______________________________________________________________________
Jeffrey O. Hill                 Internet        [email protected]
LANL MS H820                    Voice           505 665 1831
Los Alamos, NM 87545 USA        FAX             505 665 5107

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System