objc/666: mistaken compiler warnings:"objc_class_name" not defined

[pauljohn at ukans dot edu]

>Number:         666
>Category:       objc
>Synopsis:       mistaken compiler warnings:"objc_class_name" not defined
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 20 23:06:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Paul E. Johnson
>Release:        gcc-2.95.2 (as well as egcs 1.1x and newer gcc)
>Organization:
>Environment:
RedHat Linux
>Description:
I use the Swarm Toolkit (www.swarm.org) which depends on some gcc-2.95.2 features.  WHen I compile programs against swarm using gcc-2.95.2, I get these annoying warnings.  We have determined that these are just noise, there is nothing to worry about.

usr/bin/ld: warning: type and size of dynamic symbol 

`__objc_class_name_SwarmObject' are not defined 

/usr/bin/ld: warning: type and size of dynamic symbol 

`__objc_class_name_ZoomRaster' are not defined 

/usr/bin/ld: warning: type and size of dynamic symbol 

`__objc_class_name_CustomProbeMap' are not define 

/usr/bin/ld: warning: type and size of dynamic symbol 

`__objc_class_name_GUISwarm' are not defined 


I've attached a file called gcc-objc.diff that makes the problem go away.  I got it from someone who knows tons more about this than I do, I can't explain it.  His point was that there is something dubious about the current approach for objc, and his patch just clears up one misconception in a larger misconception.  I don't really care what you do, if you can make these erroneous warnings go away. They are distracting the user community. 
>How-To-Repeat:
build Swarm against gcc-2.95.2 and the compile a swarm application, such as heatbugs.
>Fix:
apply the gcc-objc.diff, recompile gcc, problem vanishes.
>Release-Note:
>Audit-Trail:
>Unformatted:
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