Can't build Ada

[Iain Sandoe]

Hi Paul,

> On 25 Nov 2022, at 20:08, Paul Koning via Gcc <gcc@gcc.gnu.org> wrote:
> 
>> On Nov 25, 2022, at 3:03 PM, Andrew Pinski <pinskia@gmail.com> wrote:
>> 
>> On Fri, Nov 25, 2022 at 11:59 AM Paul Koning via Gcc <gcc@gcc.gnu.org> wrote:
>>> 
>>> I'm trying to use fairly recent GCC sources (the gcc-darwin branch to be precise) to build Ada, starting with the latest (2020) release of Gnat from Adacore.
>> 
>> Are you building a cross compiler or a native compiler?
>> If you are building a cross, you need to bootstrap a native compiler first.
> 
> I'm not sure.  The installed Gnat is x86_64-darwin; I want to build aarch64-darwin.

you are building a cross then.

> But in any case, how does that relate to the error messages I got?  They don't seem to have anything to do with missing compilers, but rather with the use of language features too new for the available (downloadable) Gnat.

Building a cross GNAT requires that the build compiler is from the same sources as the cross - so, as Andrew says, you need to bootstrap the current sources on x86_64 and then use that compiler to build the cross to aarch64.  I’m not sure exactly where this constraint is mentioned .. but, nevertheless, it is a constraint.

FWIW: I have not done this for a few weeks (using my arm64 prototype branch) but it was working fine then.

Iain