On Tue, 1 Dec 2015 15:46:26 +0100 Björn Persson <Bjorn@xxxxxxxxxxxxxxxxxxxx> wrote: > So the L source package shall temporarily contain two versions of the > source tarball and build them both, and then install one as usual and > extract only the binary library from the other? That would complicate > the spec quite a bit even in an otherwise simple package, and when the > spec is already big and complex ... > > Time to get specific. L is libgnat, a subpackage of GCC. B is > GPRbuild, the builder that builds the Ada packages. GPRbuild is > linked to XMLada, and both GPRbuild and XMLada are linked to libgnat, > as are all other Ada programs and libraries. > > With every major GCC upgrade the soname of libgnat changes, and all > the Ada packages stop working until they get rebuilt. But rebuilding > requires a working GPRbuild. > > Previously a catch-22 was avoided because XMLada and GPRbuild were > built with Gnatmake, which is built as a part of GCC. Now they're both > built with GPRbuild instead, and Gnatmake is emitting warnings that > it's going to lose support for the project files that control the > build. The next GCC upgrade will make the problem acute. How are others supposed to handle this? > So now you're saying that the GCC package, whose spec is already 3000 > lines long, needs to contain an entire additional GCC and build large > parts of it, just to work around a limitation in Koji? I can of course > ask the GCC maintainer, but I fully expect that he'll refuse. I'm just explaining how koji works here, don't shoot me. ;) So, ideally here, there's a new gcc upgrade, the gcc maintainer would build with a compat-libgnat subpackage that installs libgnat in another place. Then they build the new gcc without it. You then can buildrequire that compat-libgnat so you can rebuild other things, then finally do another rebuild without compat-libgnat to bring everything up on the current gcc. > And then XMLada must be rebuilt before GPRbuild can be rebuilt. This > XMLada build will have to provide a compatibility instance of XMLada > linked to the old libgnat, because otherwise both versions of libgnat > would be loaded into GPRbuild the next time it runs. > > For that to be possible, the compatibility version of libgnat must > include not only the binary library, but also the old version of the > entire content of libgnat-devel, so that the compatibility instance of > XMLada can be linked. That in turn means that the old version of the > compiler itself must be provided, because GNAT performs consistency > checks and won't link code compiled with one version of GNAT to a > library compiled with another version of GNAT. > > In short, this seem like an enormous amount of trouble, mostly in the > GCC pacakage. It would be so much easier if the already existing > libraries could remain available for a limited time. I don't see any way to do that with the current setup. kevin
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