Problems building Sage with gcc 4.6.0

[Dr. David Kirkby]

I thought I'd try Sage with gcc 4.6.0, which was released a few days ago. After
installing gcc on my Sun Ultra 27 and trying to compile sage-4..7.alpha2, I get
3 failures. I run "make -k" to skip over errors. I'm hoping these are the only
three.

I suspect the PolyBoRi issue will only effect Solaris/OpenSolaris, but the lcalc
and singular issues will probably affect Linux and OS X too.

1) lcalc - no great surprise to me, as the Sun compiler has always refused to
build this code.

http://trac.sagemath.org/sage_trac/ticket/11086

This is only confirmed on OpenSolaris. Perhaps others can report on the ticket
if this is an issue on Linux or OS X with gcc 4.6.0. I'll test later with
Solaris 10.

2) Singular
http://trac.sagemath.org/sage_trac/ticket/11084
Only confirmed on OpenSolaris. Perhaps others can report on the ticket if this
is an issue on Linux or OS X with gcc 4.6.0. I'll test later with Solaris 10.

3) PolyBoRi
http://trac.sagemath.org/sage_trac/ticket/11083
Only confirmed on OpenSolaris. I expect the same to be true on Solaris 10, but I
don't believe this will be an issue on Linux or OS X, as the problem is caused
by a Sun-specific compiler flag that gcc has ignored in the past, but now
reports as an error.

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Dave