create an octave-3.0.0 optional spkg

OK, I made a first attempt which I've posted here:

http://sage.math.washington.edu/home/was/build/octave-3.0.0.spkg

It builds for 70 minutes then dies with a mysterious C++ error:

m-sbm.o pic/op-b-sbm.o pic/op-cm-scm.o pic/op-cm-sm.o pic/op-cs-scm.o pic/op-cs-sm.o pic/op-m-scm.o pic/op-m-sm.o pic/op-s
bm-b.o pic/op-sbm-bm.o pic/op-sbm-sbm.o pic/op-scm-cm.o pic/op-scm-cs.o pic/op-scm-m.o pic/op-scm-s.o pic/op-scm-scm.o pic
/op-scm-sm.o pic/op-sm-cm.o pic/op-sm-cs.o pic/op-sm-m.o pic/op-sm-s.o pic/op-sm-scm.o pic/op-sm-sm.o pic/op-s-scm.o pic/o
p-s-sm.o pic/Array-os.o pic/Array-sym.o pic/Array-tc.o pic/oct-errno.o pic/builtins.o pic/ops.o ../libcruft/blas-xtra/pic/
xerbla.o -L../liboctave -loctave -L../libcruft -lcruft -lreadline  -lncurses -ldl -lz -lm  -L/home2/sage/build/sage-2.9/lo
cal/lib/ -L/home2/sage/build/sage-2.9/local/bin/../lib/gcc-lib/x86_64-unknown-linux-gnu/4.0.3/ -L/home2/sage/build/sage-2.
9/local/bin/../lib/gcc-lib/x86_64-unknown-linux-gnu/4.0.3 -L/home2/sage/build/sage-2.9/local/lib/../lib64 -L/home2/sage/bu
ild/sage-2.9/local/lib// -L/home2/sage/build/sage-2.9/local/lib -L/usr/lib/gcc// -L/lib/../lib64 -L/lib// -L/home2/sage/bu
ild/sage-2.9/local/bin/../lib/gcc-lib/x86_64-unknown-linux-gnu/4.0.3/// -L/usr/lib64/ -L/usr/lib64 -lz -lf95 -lm
rm -f liboctinterp.so.3.0.0
ln -s liboctinterp.so liboctinterp.so.3.0.0
gcc -c -I /home2/sage/build/sage-2.9/local/include/  -I. -I.. -I../liboctave -I../src -I../libcruft/misc  -DHAVE_CONFIG_H 
 -Wall -W -Wshadow -g -O2 main.c -o main.o
g++ -I /home2/sage/build/sage-2.9/local/include/  -I. -I.. -I../liboctave -I../src -I../libcruft/misc  -DHAVE_CONFIG_H  -W
all -W -Wshadow -Wold-style-cast -g -O2 -rdynamic \
        -L..  -fPIC -L /home2/sage/build/sage-2.9/local/lib/  -o octave \
        main.o  \   
        -L../liboctave -L../libcruft -L../src -Wl,-rpath -Wl,/home2/sage/build/sage-2.9/local/lib/octave-3.0.0 \
        -loctinterp -loctave  -lcruft   \
             \
           -llapack -lcblas -lf77blas -latlas \
         -lreadline  -lncurses -ldl -lz -lm  -L/home2/sage/build/sage-2.9/local/lib/ -L/home2/sage/build/sage-2.9/local/bi
n/../lib/gcc-lib/x86_64-unknown-linux-gnu/4.0.3/ -L/home2/sage/build/sage-2.9/local/bin/../lib/gcc-lib/x86_64-unknown-linu
x-gnu/4.0.3 -L/home2/sage/build/sage-2.9/local/lib/../lib64 -L/home2/sage/build/sage-2.9/local/lib// -L/home2/sage/build/s
age-2.9/local/lib -L/usr/lib/gcc// -L/lib/../lib64 -L/lib// -L/home2/sage/build/sage-2.9/local/bin/../lib/gcc-lib/x86_64-u
nknown-linux-gnu/4.0.3/// -L/usr/lib64/ -L/usr/lib64 -lz -lf95 -lm
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/libstdc++.so: undefined reference to `_Unwind_GetIPInfo@GCC_4.2.0'
collect2: ld returned 1 exit status
make[2]: *** [octave] Error 1
make[2]: Leaving directory `/home2/sage/build/sage-2.9/spkg/build/octave-3.0.0/src/src'
make[1]: *** [src] Error 2
make[1]: Leaving directory `/home2/sage/build/sage-2.9/spkg/build/octave-3.0.0/src'
make: *** [all] Error 2
Error building octave.

real    70m21.139s  
user    40m31.256s  
sys     3m42.858s   
sage: An error occurred while installing octave-3.0.0

I probably won't work on this further, so I hope somebody else will try.

> 
> Looking at the linker failure it indicates that you have a gcc 4.2
> somewhere (maybe installed into $SAGE_LOCAL via my gcc-4.2.1 spkg :))
> and the linker gets confused because it also links against a gcc 4.0.3
> runtime. If that is the case I can have a closer look. It seems that
> the build failed right at the end.

You're right; it's some sort of conflict like that though I don't think it's
gcc-4.2 versus gcc-4.0.3, but gcc-4.2.1 versus gcc 4.0.3 stuff that's
coming from the g95 binaries that we ship with Sage.   So probably
the way to build the Octave package would be to build Sage
using gfortran/gcc from your gcc-4.2.1.spkg, then build Octave. 
I don't know if there is a way around having to do that, which basically
means no optional Octave package.  

I don't think having an optional Octave package is critical since
it takes > 1 hour to build, and the Octave developers are extremely
good at making it easy to get Octave binaries for a wide range
of platforms. 

 -- William