On Wed, 21 Dec 2016 23:00:47 +0100 Alfredo Tupone <tup...@gentoo.org> wrote:
> I would like to revive the Ada support in gentoo. > > One ada compiler is produced by AdaCore and is provided in three > versions, in the order starting from the best supported : > > 1) GnatPro, available with a contract support. > > 2) Gnat-GPL that can only build GPL-3 product > > 3) The gnat included in the gcc tree that is GPL-3 with exception. > > Gnat-GPL is very like the gnat in the gcc-tree so it can be built in > the same way of sys-devel/gcc > > To be compiled from source the gcc compiler needs a C, C++, and Ada > Compiler. I will provide one with the gnat-gpl-bin tar that could be > installed under /opt . When the gcc is properly compiled we don't need > it any more. Do I correctly understand that this is also true for gnat-gpl? Is there any Ada compiler that could be used to bootstrap Ada on platforms that lack prebuilt binaries? > I would like to start including, in the gentoo tree, GNAT-GPL > built in the same way as sys-devel-gcc and selectable with gcc-config 1. Does this mean that GNAT-GPL build will include building a C compiler? If yes, will the C compiler be installed? 2. Will it be possible to combine GNAT-GPL with a different version of regular gcc C/C++ compilers? > As for instance gnat-gpl-2014 is based on gcc-4.7.4 they cannot coexist > and gnat-gpl-2014 will block sys-devel/gcc-4.7.4 Block the whole sys-devel/ or just sys-devel/gcc[ada]? > As a reference I have my overlay on https://github.com/atupone/overlay > and a pull request at https://github.com/gentoo/gentoo/pull/3186 > > To start I need to change the toolchain.eclass > > - tc_version_is_at_least 4.7 && IUSE+=" go" > + tc_version_is_at_least 4.7 && IUSE+=" go ada" > > - # We do NOT want 'ADA support' in here! > - # is_ada && GCC_LANG+=",ada" > + # We do want 'ADA support' here! > + is_ada && GCC_LANG+=",ada" > > - for x in cpp gcc g++ c++ gcov g77 gcj gcjh gfortran gccgo ; do > + for x in cpp gcc g++ c++ gcov g77 gcj gcjh gfortran gccgo gnatbind; do > > Thats all for that. > > Then, to not change the behaviour of the gcc-compiler, we could mask the > ada use flag for sys-devel/gcc, at least temporarily > > --------------------- > > I would like to have comments on that, particularly because: > a) it is going to add a use flag to sys-devel/gcc that will bring gcc > to be rebuilt on most system, That's a minor problem. Toolchain people do this on us all the time, so... > b) the gnat-gpl, if selected with gcc-config, can be used to recompile > all the system, and maybe is not so good ? I don't really understand what you mean here. But it's probably related to the questions I asked above. -- Best regards, Michał Górny <http://dev.gentoo.org/~mgorny/>
pgp9CB2oTWDBu.pgp
Description: OpenPGP digital signature
