[winGRASS] grass on cygwin first run

[Richard Greenwood]

Glynn,

As always - thank you for your untiring willingness to field these 
questions. I just build 5.0.3 on Cygwin (verifying that only the 8.3 
xtcltk was installed). The tcltkgrass menus appear to work, but 
unfortunately, on launching NVIZ, I get the following error almost 
immediately:

===============
child killed: segmentation violation
     while executing
"exec /usr/local/grass5/etc/nviz2.2/NVWISH2.2 -f 
/usr/local/grass5/etc/nviz2.2/scripts/nviz2.2_script dem_bulter_creek8ft 
vect=road_cl -name NVIZ >&@st..."
     ("eval" body line 1)
     invoked from within
"eval exec $env(GISBASE)/etc/nviz2.2/NVWISH2.2 -f 
$env(GISBASE)/etc/nviz2.2/scripts/nviz2.2_script $argv -name NVIZ >&@stdout"
     invoked from within
"if {$argv == ""} {
#no arguments
eval exec $env(GISBASE)/etc/nviz2.2/NVWISH2.2 -f 
$env(GISBASE)/etc/nviz2.2/scripts/nviz2.2_script -name NVIZ >&@stdo..."
     (file "/usr/local/grass5/bin/nviz" line 16)
===============

Best regards,
Rich

Glynn Clements wrote:
> Richard Greenwood wrote:
> 
> 
>>>>I can't run grass as described in 
>>>>http://grass.itc.it/grass5/binary/windows_cygnus/cygwin_grass50bininstall.html
>>>>
>>>>nviz elevation.dem vect=roads & can't run because it require tcl84.dll. 
>>>>I installed tcltk 8.4.4 from ActiveTcl, but nviz can't run with 
>>>>following errors:
>>>
>>>
>>>If NVIZ requires tcl84.dll, it hasn't been compiled correctly, and
>>>won't work. Did you get a binary GRASS package, or did you build it
>>>yourself?
>>
>>I believe I have seen that error when I had both the Cygwin 8.4 tcltk 
>>and the 'Grass' 8.3 tcltk installed. I think it is generally recommended 
>>that you use only the 'Grass' 8.3 tcltk available at:
>>http://grass.ibiblio.org/grass5/binary/windows_cygnus/wingrass_xserver/
> 
> 
> I'll add to that:
> 
> What matters is the Tcl/Tk implementation which is used at compile
> time. The xtcltk package only contains static libraries, so any
> version of NVIZ which is built with that version doesn't need any
> Tcl/Tk DLLs.
> 
> If NVIZ was built incorrectly (i.e. with Cygwin's Tcl/Tk), installing
> the xtcltk package won't make it work; the only solution is to rebuild
> NVIZ.
> 
> 
>>With that said, I have never got NVIZ working under Cygwin. But I have 
>>not tried very hard because I remember reading that NVIZ did not work on 
>>Cygwin (although I forget where and when I read that). Is it possible? 
>>And if so, can anyone (Glynn) offer any pointers?
> 
> 
> NVIZ can be compiled and run under Cygwin. At least, it worked the
> last time that I tried it.
> 
> [Note: I don't actually use Cygwin. I have occasionally built GRASS
> under Cygwin for testing purposes, although I haven't done so
> recently. My Windows drive tends to hover around 97% full (mostly with
> games, which is about the only reason I even have a Windows drive), so
> I usually have to uninstall some stuff to get enough disk space.]
> 
> As for pointers: the key factor is ensuring that GRASS finds the
> Unix/X11 version of both Tcl/Tk (either the xtcltk package from the
> GRASS site, or built from the stock Tcl/Tk source).
> 
> Using the wrong version of Tcl/Tk is quite common; typically, Cygwin's
> version gets found first. The easiest way to avoid this problem is to
> simply uninstall Cygwin's Tcl/Tk package while building. You may want
> to re-install it afterwards (e.g. because Cygwin's version of gdb
> won't work without it).
> 
> Apart from that, you need the X11 libraries and headers (i.e. the
> XFree86 package), and a Unix/X11 version of OpenGL (either the version
> which is included in XFree86 4.x, or Mesa). You need an X server to
> run it; if you used the OpenGL libraries from XFree86 4.x, the X
> server needs the GLX extension (this is true for the X server in
> Cygwin's XFree86 4.x), while Mesa will work with any X server.
> 


-- 
Richard Greenwood
www.greenwoodmap.com