Using Stub Libraries
One problem with extensions is that they get compiled for a particular version of Tcl. As new Tcl releases occur, you find yourself having to recompile extensions. This was necessary for two reasons. First, the Tcl C library tended to changes its APIs from release to release. Changes in its symbol table tie a compiled extension to a specific version of the Tcl library. Another problem occurred if you compiled tclsh statically, and then tried to dynamically load a library. Some systems do not support back linking in this situation, so tclsh would crash. Paul Duffin created a stub library mechanism for Tcl that helps solve these problems.
The main idea is that Tcl creates two binary libraries: the main library (e.g., libtcl8.2.so ...
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