[Bug bootstrap/51072] Build with --disable-bootstrap fails in libitm

[gary at intrepid dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51072

--- Comment #7 from Gary Funck <gary at intrepid dot com> 2011-11-21 02:53:42 UTC ---
(In reply to comment #6)
> On Thu, 10 Nov 2011, rguenth at gcc dot gnu.org wrote:
> 
> > Shouldn't libitm be built with the "stage1" g++ as it is a target library,
> > even with --disable-bootstrap?
> 
> Yes, as I said in 
> <http://gcc.gnu.org/ml/gcc-patches/2011-11/msg01382.html> building it with 
> a pre-installed compiler is wrong.

Isn't it also an error to build libitm unless: (1) --enable-languages=c++ is
asserted, or (2) --enable-libitm is asserted?  For (2) arguably it should imply
that c++ will be built, or disallowed.

We're seeing two failure modes noted in comment #1 and comment #2 for systems
with not-so-modern versions of g++ installed.