[gecode-users] Adventures in installation

[Christian Schulte]

Dear David,

let me explain what happens here. I am a Cygwin user since a long time ;-(

 - The first thing you notice is that the gcc shipped with Cygwin rejects
legal code. We might fix that for the 
   next release, most likely (see below).
 - The other thing is a bug in Gecode 2.0.0 that has been fixed for 2.0.1
(it has to do with static linking, Guido is that true?).

But, actually, my recommendation is very simple: forget gcc on Cygwin as
there is no need whatsoever to use it.

As said, I use cygwin every day but together with the freely available
Express Edition of Microsoft's Visual C++ compiler. It works as follows:
download, install, set up the environment that cygwin can pick up the
necessary environment variables for the commandline version of the compiler
(easy, has been discussed before on this list) and then ./configure CC=cl
CXX=cl (the documentation discusses compiling for MSVC).

The benefits are enormous. Compilation is much much faster and so is the
generated code.

I stopped using gcc on cygwin completely as it is so outdated and any
improvement is not in sight. But I have to admit that even if a recent gcc
would be available on cygwin I still would use MSVC.

I am not even sure that we should waste any effort on hacking around gcc's
bugs under cygwin, maybe the best would be to just say on the documentation
what I said in this email and state clearly that gcc is not supported on
cygwin (as dynamic linking is broken anyway).

Would that be a hardship for any of the users?

Thanks for the feedback!
Christian

--
Christian Schulte, www.ict.kth.se/~cschulte/


-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of David Barton
Sent: Tuesday, January 15, 2008 3:48 PM
To: users at gecode.org
Subject: [gecode-users] Adventures in installation

Gentle gecode users:

I have a virgin machine on which I am attempting to load gecode.  Because it

is a virgin, beautiful as it is, I downloaded a new cygwin installation, so 
it has the latest everything.  Downloading gecode and doing .configure, 
everything went splendidly.  When I did a make, I got a g++ compile error on

ranges-diff.icc --- the goto statement at line 94 gave me one of those 
strange C++ errors that you are branching to a label in a wrong dimension, 
or whatever they want to say.  I got that to work by putting a loop around 
the whole thing, moving the label down to the bottom of the loop, and 
sticking a nonsense statement after the loop.  Fine.

Now, when it gets to the final load statement of examples/bacp.exe, I am 
getting ten thousand undefined reference statements in 
minimodel/bool-expr.cc and int/var/bool.icc.  Most of these are of BoolVars 
of various sorts.  Those I *don't* know what to do about.  I suppose having 
an example not load won't kill me, but I'd like to know what is going on.

Any assistance would be greatly appreciated.....

David L. Barton
Director, Rosetta CoE
EDAptive Computing, Inc.
1245-G Lyons Road, Dayton, OH 45458
(937) 433-0477

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