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. Thanks, Andrew Pinski > > It fails for several reasons. One is that two source files use [ ] for array > initializer brackets when ( ) is apparently supposed to be used instead. > Once I fix that, I get a pile of messages I don't know what to do about: > > s-imagei.ads:95:11: declare_expression is an Ada 2020 feature > s-valueu.ads:152:09: declare_expression is an Ada 2020 feature > s-valueu.ads:160:09: declare_expression is an Ada 2020 feature > s-valueu.ads:184:06: "Subprogram_Variant" is not a valid aspect identifier > s-valuei.ads:80:11: declare_expression is an Ada 2020 feature > s-valuei.ads:95:08: declare_expression is an Ada 2020 feature > s-valuei.ads:141:06: "Subprogram_Variant" is not a valid aspect identifier > s-widthu.ads:84:09: declare_expression is an Ada 2020 feature > s-widthu.ads:93:11: run-time library configuration error > s-widthu.ads:93:11: file s-imgint.ads had parser errors > s-widthu.ads:93:11: entity "System.Img_Int.Image_Integer" not available > compilation abandoned > make[2]: *** [ada/contracts.o] Error 1 > > Given that the current open source Gnat is from 2020, so (apparently) it > doesn't support Ada 2020 features, how is someone supposed to build the > current GCC? I looked in the prerequisites listing on the webpage, but it > says that the Gnat that is built on GCC 5.1 is sufficient. That seems to be > wrong; the GCC in Gnat 2020 is 8.4.1 and it is apparently too old to work. > > paul >
