On Nov 13, 2018, Richard Biener <richard.guent...@gmail.com> wrote: > Reworking gnattools build to always use host CC/CXX in "stage1" (or for > crosses) > rather than doing sth different.
> Yeah, but gnattools is bootstrapped, right? No, it's not built in stage1, it's a post-bootstrap host subpackage. > For --disable-bootstrap you get binaries built with the host compiler > throughout and that's good. I guess it *could* be built with the host compiler, and linked with that runtime. Then, in order to run it, you might still need the previous gnat rts shared libs. Just like for a non-bootstrapped compiler front-end, yeah. Whereas for a bootstrapped compiler, you'd want to use what, the stage2 compiler, that built other final host tools, to build gnattools as well? All doable, but not without additional complexity. I'm afraid I fail to see the upside. Unfortunately we don't have a lot of other post-bootstrap host tools linked (on native builds) with target libraries to draw parallels. I guess we could reason about them as if they were part of the gcc/ subdir, and this would lead down the path you suggest. I will then point to the complications arising from using a just-built libstdc++ in subsequent stages, and in later target builds in the same stage, and conclude it's far from trivial, it's actually quite error-prone and hardly glitch-free, and so it's not too hard to understand why gnat, that had to take care of this before we even thought of bootstrapping libstdc++, took a different path. Anyway... I won't take your suggestion as an objection to the proposed patch, but I will say that I still have a lot to learn about the Ada build machinery to be able to grasp the impact your suggestion might have on existing uses, so, as much as I like uniformity and symmetry, I'm not jumping right onto it ;-) -- Alexandre Oliva, freedom fighter https://FSFLA.org/blogs/lxo Be the change, be Free! FSF Latin America board member GNU Toolchain Engineer Free Software Evangelist Hay que enGNUrecerse, pero sin perder la terGNUra jamás-GNUChe
