Tcl Source Code

There are several problems with auto_execok on Windows. See for example these tickets: 4ab2ccc4a2, 1244733, e21fc32c2a. Another issue is that the search path constructed by [auto_execok] is quite ad-hoc, while the path used by [exec] may be dependent on the OS version and even on registry values, as documented on http://msdn.microsoft.com/en-us/library/windows/desktop/aa365527(v=vs.85).aspx.

All this can be solved by aligning the search procedure of [auto_execok] with [exec]. To do this, a small helper proc is needed to do call the appropriate C functions from [auto_execok].

I'm attaching a patch to do this. Note that I didn't know where precisely to declare and create the helper functions, so this may require some review.