Why are mpfr, mpc and gmp needed for gcc?

[Ian Lance Taylor]

Jose-Marcio Martins da Cruz <Jose-Marcio.Martins@mines-paristech.fr>
writes:

> Is there a big difference when using these libraries from system
> available math library ? Is this difference more noticeable in some
> platforms than in other ones ?

When cross-compiling to a system that does not use the same floating
point format as the host, the system math libraries will not do the
right thing.

Ian