gmp-4.1.3-rc1

[Kevin Ryde]

Roberto Bagnara <bagnara at cs.unipr.it> writes:
>
> It is a pity that --enable-cxx does not default to
> `yes' when an adequate C++ compiler is available.

"detect" would probably be the best default, if it could be made to
work.

> What are the reasons behind
> the current default?

Notes from configure.in:

# IMPROVE ME: The default for C++ is disabled.  The tests currently
# performed below for a working C++ compiler are not particularly strong,
# and in general can't be expected to get the right setup on their own.  The
# most significant problem is getting the ABI the same.  Defaulting CXXFLAGS
# to CFLAGS takes only a small step towards this.  It's also probably worth
# worrying whether the C and C++ runtimes from say gcc and a vendor C++ can
# work together.  Some rather broken C++ installations were encountered
# during testing, and though such things clearly aren't GMP's problem, if
# --enable-cxx=detect were to be the default then some careful checks of
# which, if any, C++ compiler on the system is up to scratch would be
# wanted.