Can't build Ada

[Paul Koning]

> On Nov 26, 2022, at 10:58 AM, Iain Sandoe <idsandoe@googlemail.com> wrote:
> 
> Hi Paul,
> 
> I am part way through the exercise on both macOS 11 (X86) and 12 (Arm64).
> 
> ** However, I am using gcc-7.5 as the bootstrap compiler, not gcc-5.1.

I'm not using 5.1 -- I only quoted that version number because the install documentation mentions it.  The actual bootstrap compiler is 8.4.1:

pkoning:gcc-darwin-x86 pkoning$ /usr/local/gnat/bin/gcc --version
gcc (GCC) 8.4.1 20200430 (for GNAT Community 2020 20200818)

> You might find problems unless you actually start a Rosetta 2 shell - so 
> “ arch -x86_64 bash “ 
> and then go from there (this seems to ensure that sub-processes are started as x86_64)
> 
> (with this, bootstrap succeeded for both x86_64 Rosetta 2  and rebased Arm64 branch native - r13-4309-g309e2d95e3b9)
> 
> I will push the rebased arm64 branch when testing is done.
> 
>> So I'm guessing I'll have to do this in two parts, first build a newer but not-latest Gnat from a release that doesn't include the problematic constructs, then follow that by using the intermediate to build the current sources.
>> 
>> I wonder if this incompatibility was intentional.  If not it would be good for the Ada maintainers to fix these and ensure that the current code can still be built with the most recent public release of Gnat.  Conversely, if it is intentional, the documentation should be updated to explain how to build the current code.
> 
> The current statement  (https://gcc.gnu.org/install/prerequisites.html) is:
> 
> GNAT
> In order to build GNAT, the Ada compiler, you need a working GNAT compiler (GCC version 5.1 or later).
> 
> so, if 5.1 is not working, then perhaps a PR is in order.

I will do that, if the "shell in Rosetta" thing doesn't cure the problem.

	paul