On Fri, Dec 12, 2014 at 7:51 PM, Kevin Kofler <kevin.kofler@xxxxxxxxx> wrote: > Michael DePaulo wrote: >> I too come from an Ubuntu/Debian background. Like other major pieces >> of software, Ubuntu and Debian both make multiple 2.x or 3.x versions >> of LLVM available for each release of their OS. They do the >> following: >> 1. The major version is specified in the package name. For example, >> "llvm-3.4" and "llvm-3.5" are the names of separate packages. The >> actual package versions are like "3.4.2-13" & "3.5-6" respectively >> >> 2. The package "llvm" is a small package that depends on the >> recommended major version for developers. For example, in Jessie, 3.5 >> is the recommended major version, and Jessie "llvm" contains symlinks >> such as: >> /usr/bin/llvm-extract -> /usr/bin/llvm-extract-3.5 >> >> Would Fedora permit someone like myself to contribute an LLVM >> packaging scheme like that? > > That would NOT be a good idea, for a simple reason: The version of LLVM Mesa > (i.e., libGL) links ends up linked into MANY executables. If you link some > other library against some other version of LLVM, and then an application > ends up directly or indirectly linking both that library and libGL, it ends > up indirectly linking the 2 incompatible versions of LLVM and crashing. We > have already had this happen, and other distributions too, see e.g.: > http://www.valdyas.org/fading/index.cgi/2011/10/08#llvm > and still, months later (when it was already long fixed in Fedora by using a > common shared LLVM, but apparently not on some other distributions): > http://mail.kde.org/pipermail/kimageshop/2012-September/011387.html > > (Now, to be fair, it turns out that OpenGTL has since been removed from > Fedora because Krita no longer uses it, but the exact same problem can > happen with any of the other consumers of LLVM.) > > There can be only one version of LLVM in the whole distribution at a time. > > This topic has already come up several times on this mailing list (basically > each time such a rebase was done), please read the archives, e.g., this > thread: > https://lists.fedoraproject.org/pipermail/devel/2014-March/197227.html > and my reply to a proposal essentially identical to yours: > https://lists.fedoraproject.org/pipermail/devel/2014-March/197278.html > > Kevin Kofler Understood, sorry for not searching the archives. -Mike -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
