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Re: [RFC] Update gmp/mpfr/mpc minimum versions


On April 26, 2016 8:39:28 PM GMT+02:00, Marc Glisse <marc.glisse@inria.fr> wrote:
>On Tue, 26 Apr 2016, Bernd Edlinger wrote:
>
>> as we all know, it's high time now to adjust the minimum supported
>> gmp/mpfr/mpc versions for gcc-7.
>>
>> So this attached patch is now targeting at only supporting the
>currently
>> latest relased gmp-6.1.0, mpfr-3.1.4 and mpc-1.0.3, instead of trying
>> to support all previous versions, especially in-tree, but also
>without the
>> in-tree configuration the previously used versions are really
>creating
>> trouble nowadays.
>
>For in-tree builds, requiring the latest version makes sense to me.
>When 
>building gcc with a pre-installed gmp/mpfr/mpc (say the one provided by
>
>your linux distribution), that's much more painful, and the benefit is
>not 
>as clear. What "trouble" do you have in mind?
>
>> To support gmp-6.1.0 in-tree we have to set AM_CFLAGS=-DNO_ASM
>> as already done with mpfr.  This was already discussed recently on
>this list.
>
>Note that gmp-6.1.1 is supposed to be out any day now and will not
>require 
>-DNO_ASM anymore.

I agree with Marc here - we should only update the version used by download prerequisites and document that this is the only supported version for in-tree builds.

Richard.


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