Re: [MACTCL] Setting environment vars from tcl

[James B. <jk...@mr...>]

OK, in a follow up to my own findings, I now see that there's still a few
other tcl problems (and perhaps system problems) involving environment
variables.

The first is that exec seems to clear all of them. Eg try "exec zsh" and then
printenv. I can get this to work in a test C application using NSGetEnviron
and execl, so it looks like it's a tcl specific bug.

The second is that although setting environment variables does appear to work
correctly changing the value of DYLD_LIBRARY_PATH appears to have no
effect. I've tried changing PATH by using "exec prog", set env(PATH), and then 
exec prog once more. This demonstrates that the environment really is being
set correctly. However I can't get "load" to work by changing
DYLD_LIBRARY_PATH within wish.

If I change it outside of wish (in zsh say) then load within subsequent wishes
works fine (thus demonstrating that the recent patch to fix this works fine -
cheers). I can't see any mention of DYLD_LIBRARY_PATH in tcl, so does this
imply that the NSAddImage function uses a copy of DYLD_LIBRARY_PATH inherited
at application startup and not the copy found in the current environment
variable?

I'm not sure how much further I can go with my changes to this code as I'm a
complete Mac newbie really. I'm still finding it virtually impossible to
find documentation. Anyone know where _NSGetEnviron is documented? I did a
systemwide grep and failed to find it. Google finds little else other than the 
tcl source itself. Come on Apple! Either gives us docs or the source for the
libraries themselves. Please?

(This is no reflection on you Jim - you've done a stirling job and I thank
both you and Apple for allowing you the time and resources. Thanks.)

James

-- 
James Bonfield (jk...@mr...)   Fax: (+44) 01223 213556
Medical Research Council - Laboratory of Molecular Biology,
Hills Road, Cambridge, CB2 2QH, England.
Also see Staden Package WWW site at http://www.mrc-lmb.cam.ac.uk/pubseq/