On Fri, 12 Aug 2016, Bernd Edlinger wrote:
> > + # MPFR v3.1.0 moved the sources into a src sub-directory.
> > + if ! test -d ${srcdir}/mpfr/src; then
> > + as_fn_error "Building GCC with MPFR in the source tree is only handled
> > for MPFR 3.1.0+." "$LINENO" 5
> > + fi
>
> I think it is a good idea to detect this situation, but you should advise the
> user
> that he has to use exactly the same version(s) that
> contrib/download_prerequisites
> installs.
We're not doing an exhaustive check for the GMP/MPFR/MPC dependencies
here, so I think it's enough to point out the outright incompatibility.
It might make sense though to have an additional check in the component
requiring these libraries and issue a warning if a mismatch is detected
with in-tree versions.
Maciej
