Re: Libtool 1.5.8 problems on OSX: ${wl} evaluation [#9382]

[Peter O'Gorman]

George Feinberg wrote:
> Note that ALL 3 of these libraries load all of the core DB .o files, and 
> therefore
> duplicate those symbols.

This is the problem. Tcl, for some reason, uses NSAddImage to load objects 
at runtime on darwin/Mac OS X. NSAddImage, and NSAddLibrary, are unable to 
load objects privately, so for flat_namespace images you will get conflicts 
and the library will fail to load. I have no idea why the Tcl folks went 
with loading objects of type MH_DYLIB, not MH_BUNDLE, it makes no sense. It 
also means that Tcl can not work on the original Mac OS X 10.0.x, that api 
was not available then. Note that the file which does this is (c) Apple 
Computer and atributed to Wilfredo Sanchez, but Wilfredo left Apple before 
the NSAddImage api became available, so it isn't his fault :)

If you rebuild all your libraries with MACOSX_DEPLOYMENT_TARGET set to 10.3, 
it should cause you to get two level namespace libraries, which may be 
capable of being simultaneously loaded by Tcl.

Alternatively, you could try and ensure that libdb_cxx is not loaded by Tcl 
at the same time as libdb_tcl or libdb.

I don't really have time until the weekend, maybe next week, but if you send 
me some info on how to replicate this issue, I'll try and give you some more 
alternatives.

Peter
--
Peter O'Gorman - http://www.pogma.com