Tcl Source Code

When creating a child interpreter, environment variables are handled differently between Linux and Windows. While I find the behaviour under Linux logical, I don't understand the behaviour under Windows, especially the fact that creation of a child interpreter affects the environment variables in the parent interpreter.

The attached file exercise.tcl demonstrates the issue when I run it under the two mentioned OS's. My observations:

> tclsh exercise.tcl
unix
1
0
0
0

> tclsh exercise.tcl
windows
1
0
1
1

I believe that this is more severe than "Minor". So I take the liberty to increase the severity level. Also, making the questionable behaviour under windows more conspicuous by presenting it here in the ticket body (instead of an attachment).

% set tcl_platform(platform)
windows
% info exists env(HOME)
1
% unset env(HOME)
% info exists env(HOME)
0
% interp create child
child
interp eval child {info exists env(HOME)}
1
% info exists env(HOME)
1