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1. Directly reading interp->result is deprecated in Tcl 8.0 and later; you're supposed to use Tcl_GetStringResult. This code finally broke with Tcl 8.5, because Tcl_GetVar can now have side-effects on interp->result even though it preserves the logical state of the result. (There's arguably a Tcl issue here, because Tcl_GetVar could invalidate the pointer result of a just-preceding Tcl_GetStringResult, but I doubt the Tcl guys will see it as a bug.) 2. We were being sloppy about the encoding of the result: some places would push database-encoding data into the Tcl result, which should not happen, and we were assuming that any error result coming back from Tcl was in the database encoding, which is not a good assumption. 3. There were a lot of calls of Tcl_SetResult that uselessly specified TCL_VOLATILE for constant strings. This is only a minor performance issue, but I fixed it in passing since I had to look at all the calls anyway. #2 is a live bug regardless of which Tcl version you are interested in, so back-patch even to branches that are unlikely to be used with Tcl 8.5. I went back as far as 8.0, which is as far as the patch applied easily; 7.4 was using a different error processing scheme that has got its own problems :-( |
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