[GRASS-dev] TclTk linking in GRASS 6.4

[William Kyngesburye]

On Apr 3, 2013, at 10:13 PM, Hamish wrote:

> no answer for you, just fyi see also 'd.what.vect -e' and
> 'g.mapsets -s' for common compiled C modules calling tcl/tk
> forms.

On Apr 4, 2013, at 6:16 AM, Glynn Clements wrote:

> William Kyngesburye wrote:
> 
>> Trying to understand the linking of TclTk in GRASS 6.4... I was poking
>> around and noticed that libgrass_form itself does not link TclTk, and
>> it appears it just creates form content in text and html. This content
>> can be displayed with TclTk by the "form" applet, which does link
>> TclTk, or in the console like with v.what, which does not link or use
>> TclTk.
>> 
>> Is this the general case then - none of the grass libraries link or
>> use TclTk directly, just some applets (like form) and modules (like
>> NVIZ) do?
> 
> Correct.
> 
> lib/form consists of the "form" program, a custom Tcl/Tk interpreter
> which adds a few commands for interfacing with the GRASS DBMI library,
> and a library which spawns the form program and feeds it a mixture of
> Tcl/Tk code and HTML.
> 
> NVIZ consists of a custom Tcl/Tk interpreter which adds commands for
> interfacing with the OGSF library, plus a significant amount of Tcl/Tk
> code which uses the custom interpreter.
> 
> v.digit also links against Tcl/Tk (note that it has its own embedded
> copy of the form library).
> 
>> If so, I need to rethink my OS X arch substitutions to handle
>> 32bit-only TclTk in 64bit GRASS.
> 
> In theory, it should suffice to build the two interpreters
> ($GISBASE/bin/nviz and $GISBASE/etc/form/form) plus v.digit as 32-bit
> executables.


I did a test (changing the makefiles) with a 64bit d.what.vect and libform and 32bit form.  Still works - 64bit d.what.vect/libform has no problem spawning a 32bit form.

The main change needed then is adding a custom form.o compile target to libform makefile so that it can have separate CFLAGS from the default .o target.  I hope this isn't a problem (I cut-n-paste from rules.make plus a couple changes).

-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/

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