Hi Paul, > On 26 Nov 2022, at 15:48, Paul Koning via Gcc <gcc@gcc.gnu.org> wrote:
>> On Nov 25, 2022, at 3:46 PM, Iain Sandoe <idsan...@googlemail.com> wrote: >> >>> On 25 Nov 2022, at 20:13, Andrew Pinski via Gcc <gcc@gcc.gnu.org> wrote: >>> >>> On Fri, Nov 25, 2022 at 12:08 PM Paul Koning <paulkon...@comcast.net> wrote: >>>> >>>>> On Nov 25, 2022, at 3:03 PM, Andrew Pinski <pins...@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 have to build a x86_64-darwin compiler first with the same sources >>> as you are building for aarch64-darwin. >> >> So .. >> 1/ if you are on arm64 Darwin, >> - the first step is to bootstrap the compiler using Rosetta 2 and the >> available x86_64 gnat. >> >> 2/ if you are on x86_64 Darwin… >> - the first step is to bootstrap the compiler using the available x86-64 >> gnat. > > Thanks all. > > I tried that (#1) and got the same failure. The trouble seems to be that the > current sources have Ada2020 constructs in them and the available Gnat > doesn't support that version. The commit that introduces these (or some of > them at least) is 91d68769419b from Feb 4, 2022. 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. 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. cheers Iain
