Re: [Plplot-devel] Help needed in setting global Tcl variables for the PLplot case

[Maurice L. <mj...@br...>]

On Monday, October 28, 2013 at 14:44:48 (-0700) Alan W. Irwin writes:
 > On 2013-10-28 14:23-0700 Alan W. Irwin wrote:
 > 
 > > The goal here is to make it easy for the user to choose between
 > > using either version 3 of [incr Tcl_tk] or version 4.  In fact, my
 > > testing of those two cases is being held up because I don't have
 > > an easy way to switch between them (without a lot of code editing).
 > > So some quick help on how to make this possible would be appreciated.
 > 
 > Soon after I sent the above appeal off, I discovered how our build
 > system set the macro TCL_DIR and how bindings/tcl/tclMain.c used that
 > macro to help determine the Tcl global variable $dir. Therefore, I
 > will try something similar to globally set itcl_package_name, etc.,
 > (unless you guys can think of a better method).

I think in order to avoid coding in package version dependencies where none
should exist, make sure your desired tcl package library directories are all
properly positioned in auto_path.  E.g. on my Kubuntu 12.04.3 box:

$ tclsh8.4
% puts $auto_path
/usr/share/tcltk/tcl8.4 /usr/lib /usr/local/lib/tcltk /usr/local/share/tcltk /usr/lib/tcltk /usr/share/tcltk

$ tclsh8.5
% puts $auto_path
/usr/share/tcltk/tcl8.5 /usr/lib /usr/local/lib/tcltk /usr/local/share/tcltk /usr/lib/tcltk /usr/share/tcltk

That first entry enables it to find the right packages.

-- 
Maurice LeBrun