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Re: [PATCH] Fix web/60933

On Thu, 24 Apr 2014, Rainer Orth wrote:

> Richard Biener <> writes:
> > The GMP people complained that we "advertise" outdated versions
> > in our install instructions.  I tried to address that by not
> > explicitely listing a "good" version but only mention the version
> > that is the minimum requirement.  I also added a reference to
> > contrib/download_prerequesites as the recommended way to do
> > in-tree builds (so we don't get random bugreports for that
> > with untested combinations of gmp/mpfr/mpc versions).
> >
> > We probably should try to bump the versions used by that script
> > to something more recent though (should we do that for the 4.9
> > branch even?).  Any idea what to choose here?  I'd say mpc
> > 1.0.2 is fine, so is mpfr 3.1.2, but should we avoid the 6.0.0 version
> > of gmp?  We shouldn't change those versions too often, otherwise
> > we end up with a lot of garbage in gcc/infrastructure (we don't
> > want to break old versions of the script).
> >
> > Meanwhile is does the patch look ok?
> I'd strongly advise against it: in the past we've had serious problems
> with versions newer than advertised in install.texi on some platforms.
> Until we have positive evidence that specific newer versions work on a
> wide range of platforms, we shouldn't suggest to our users that they
> might.  Many users tried with the then-current versions in the past, and
> the failures are often quite hard to trace back to this.

Note that I explicitely added the reference to download_prerequesites
for the case the user wants/needs to build the libraries together
with GCC.  That should address this concern, no?

> For the 4.9 branch, we should leave this as is: the benefit is almost
> certainly not worth the trouble.

Of course.  Though the version referenced from
is the one from trunk.


Richard Biener <>
SUSE LINUX Products GmbH - Nuernberg - AG Nuernberg - HRB 16746
GF: Jeff Hawn, Jennifer Guild, Felix Imend"orffer

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