[gentoo-dev] tcl/tk-8.6 incompatibilities

[justin]

Hi,

some packages do not build against version 8.6 and show errors like this:

error: 'Tcl_Interp' has no member named 'result'

and

error: 'Tcl_Interp' has no member named 'errorline'

This is due to a removal of an old and deprecated (at least since 2004)
feature.

Here some simple fixes:


Version A (will stop working with tcl/tk-9.0):

append

-DUSE_INTERP_RESULT and/or -DUSE_INTERP_ERRORLINE

to the *FLAGS.



Version B (long lasting and better):

patch code (and send upstream) to use
Tcl_GetResult(), Tcl_GetStringResult(), Tcl_SetResult(),
Tcl_SetStringResult(), Tcl_GetErrorLine()

Examples:

@@ -1980,10 +1980,10 @@ void tcl_run(
     trace = (char *)Tcl_GetVar(interp, "errorInfo", 0);

     if (trace == NULL)
-      trace = interp->result;
+      trace = Tcl_GetStringResult(interp);

     fprintf(stderr, "%s: TCL error @ line %d: %s\n",
-            script, interp->errorLine, trace);
+            script, Tcl_GetErrorLine(interp), trace);
     }

   Tcl_DeleteInterp(interp);



Some more little facts:

* Please link against libtcl.so and libtk.so instead of libtcl8.6.so and
libtk8.6.
* Version 8.6 supports pkg-config
* Version 8.6 is subslotted.
* Reference bug https://bugs.gentoo.org/show_bug.cgi?id=451368

Thanks justin