From: thealmightydaev@... (Dave Dembinski)
Date: 2003-10-10T02:08:22+09:00
Subject: Re: LibNeural on OS X: undefined symbols

Akimichi Tatsukawa <akimichi@mbox.co.jp> wrote in message news:<87k7fhg42q.wl@tatsu.localdomain>...
> Hi, I'm Akimichi Tatsukawa, the author of LibNeural.
> It seems to me that linking to the standard C++ library is not properly done.
> In the file 'ext/LibNeural/extconf.rb', check out the following option
> if it is proper or not under your environment.
> 
> $LDFLAGS = "-L/usr/lib -lstdc++"
> 
> I don't know about Mac, so I might give your a wrong advice.
> 

Thanks, Akimichi!  I got it working, finally, but it took some doing. 
Apple doesn't include libruby.a in their standard distro, so I had to
build that and install it form 1.6.8, then make the following changes
to the extconf.rb file you pointed at:

$CFLAGS="-no-cpp-precomp" 
$LDFLAGS="-L/usr/lib -ltinfo -lgcc -lstdc++" 

I added this to the RubyOnMacintosh section of rubygarden.org, in case
anyone else could find it useful.

thanks again, 
_dave

> 
> At Sat, 1 Mar 2003 06:05:50 +0900,
> Dave Dembinski wrote:
> > 
> > Running OS X 10.2.4, trying to make use of Akimichi Tatsukawa's
> > LibNeural package.  I downloaded Swig 1.3.9 and built it from source
> > (it's the version listed on the LibNeural page as having been used to
> > test it), with no errors I could see.  The LibNeural package also
> > built with no errors, but when I ran the test scripts I got a whole
> > mess of undefined symbol errors like so:
> > 
> > ruby odd_even.rb
> > dyld: ruby Undefined symbols:
> > __ZNSi7getlineEPcic
> > __ZNSiC4EPSt15basic_streambufIcSt11char_traitsIcEE
> > __ZNSiD4Ev
> > __ZNSirsERf
> > __ZNSirsERi
> > __ZNSoC4EPSt15basic_streambufIcSt11char_traitsIcEE
> > __ZNSoD4Ev
> > __ZNSolsEPFRSoS_E
> > __ZNSolsEd
> > __ZNSolsEl
> > __ZNSolsEm
> > __ZNSt13basic_filebufIcSt11char_traitsIcEE4openEPKcSt13_Ios_Openmode
> > __ZNSt13basic_filebufIcSt11char_traitsIcEE5closeEv
> > __ZNSt13basic_filebufIcSt11char_traitsIcEEC1Ev
> > __ZNSt13basic_filebufIcSt11char_traitsIcEED4Ev
> > __ZNSt8ios_base4InitC1Ev
> > __ZNSt8ios_base4InitD1Ev
> > __ZNSt8ios_baseC2Ev
> > __ZNSt8ios_baseD2Ev
> > __ZNSt9basic_iosIcSt11char_traitsIcEE4initEPSt15basic_streambufIcS1_E
> > __ZNSt9basic_iosIcSt11char_traitsIcEE5clearESt12_Ios_Iostate
> > __ZNSt9basic_iosIcSt11char_traitsIcEED4Ev
> > __ZSt4cout
> > __ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_
> > __ZSt9terminatev
> > __ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc
> > __ZStrsIcSt11char_traitsIcEERSt13basic_istreamIT_T0_ES6_PS3_
> > __ZTTSt14basic_ifstreamIcSt11char_traitsIcEE
> > __ZTTSt14basic_ofstreaTrace/BPT trap
> > 
> > Has anyone run into anything similar on OS X or anywhere else for that
> > matter?  I searched the newsgroup but the only thing I found relating
> > to LibNeural was a release announcement.
> > 
> > Thanks, 
> > _dave
> > 
> >