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Re: Support Library Requirements for GCC 7.1

On 3 May 2017 at 16:09, Joel Sherrill wrote:
> That's right. I was asking about the minimum. I didn't know
> about download_prerequisites but that is downloading versions
> significantly about the minimum documented. And they are bug
> fix releases from the current versions. That leads me to believe
> that script is arbitrary.

No, they're not arbitrary.

> What's the justification/testing that
> leads to an update of that script.

Sufficient testing :-)

For example, if all the major distros ship with ISL 0.16 and build
with that, and have done for some time, then that provides pretty good
testing and justifies bumping the version in the script from 0.15 to

> Someone asked for details on what failed along my effort, so I
> am repeating it and capturing details.
> I started with the same versions we used with gcc 6.3.0.
> %define mpfr_version   2.4.2
> %define mpc_version    0.8.1
> %define gmp_version    4.3.2
> This failed as follows:
> configure: error: Building GCC with MPFR in the source tree is only handled
> for MPFR 3.1.0+.
> **Issue**: That contradicts the minimum of MPFR 2.4.2 in
> INSTALL/prerequisites.html

The minimum for "MPFR in the source tree" is higher.

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