[Tcl-bugs] [ tcl-Bugs-3033027 ] load: loaded shared libraries don't export symbols (OS X)

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Bugs item #3033027, was opened at 2010-07-22 14:47
Message generated for change (Settings changed) made by petasis
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Category: 40. Dynamic Loading
Group: current: 8.6b1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Georgios Petasis (petasis)
>Assigned to: Daniel A. Steffen (das)
Summary: load: loaded shared libraries don't export symbols (OS X)

Initial Comment:
I have observed that under OS X 10.6 (at least), libraries loaded with Tcl's load are not visible from other libraries, also loaded with load.
Thus if you load a library A, and then load a library B that depends on A, library B is not loaded if A does not resides on a directory the dynamic linker searches for libraries. It is not recognised that library A is already loaded in the process.
This seems OS X specific, as I cannot reproduce at least under windows & linux.

I know that load calls dlopen(..., RTLD_GLOBAL); which does not seem to do as advertised.
I had to call NSAddImage(NSADDIMAGE_OPTION_RETURN_ON_ERROR |
NSADDIMAGE_OPTION_WITH_SEARCHING |
NSADDIMAGE_OPTION_MATCH_FILENAME_BY_INSTALLNAME ), after I loaded lib A, to be able to load lib B.
However, NSAddImage is already deprecated in 10.6.

The relevant thread is here:

http://groups.google.gr/group/comp.lang.tcl/browse_thread/thread/87266afd63143a11/f9b735ee56100d57

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