> On 19 Jan 2017, at 12:31, Richard Biener <richard.guent...@gmail.com> wrote: > > On Thu, Jan 19, 2017 at 12:04 PM, Tristan Gingold <ging...@adacore.com> wrote: >> >>> On 19 Jan 2017, at 11:46, Richard Biener <richard.guent...@gmail.com> wrote: >>> >>> On Thu, Jan 19, 2017 at 11:11 AM, Tristan Gingold <ging...@adacore.com> >>> wrote: >>>> Is it ok to require gcc 4.9 (3 years old) or later to build GNAT ? >>>> >>>> We plan to use gcc exceptions within the GNAT front-end (previously we >>>> were using a FE specific exception mechanism). >>>> This requires a matching implementation in the runtime, which was last >>>> changed for gcc 4.9 >>>> Our idea is to completely remove in GNAT the support of the FE specific >>>> exception mechanism. >>>> >>>> Is anyone opposed to such a change ? >>> >>> But as you are bootstrapping you should always have a matching >>> runtime, no? >> >> Yes for stage-2 and stage-3, but not always for stage-1. >> >> To clarify: the gnat1 and gnatbind binaries are not linked with libgnat, but >> are built in a standalone way. GNAT1_OBJS contains both the objects for the >> compiler sources and the objects for the needed runtime sources. > > Oh, I can see how that breaks then... the stage1 gnat1/gnatbind > should use the host Ada compiler runtime
That's a possibility we are also discussing, but it is much more difficult. Maybe for later (Eric strongly supports that idea). > (does bootstrapping GNAT with > a non-GNAT Ada compiler work? It really should!), I could work on that if you (or someone else) gives me a non-GNAT Ada compiler for my machine :-) Tristan.
