On Tue, Mar 20, 2012 at 5:50 PM, Brendan Conoboy <blc@xxxxxxxxxx> wrote: > On 03/20/2012 09:37 AM, drago01 wrote: >>> >>> I'm a big fan of cross compilation, but introducing it into Fedora in >>> order >>> to support ARM seems unlikely to succeed for too many reasons to go into. >> >> >> The reasons are? .... > > > Okay, why not? > > The ones off the top of my head, and this is by no means exhaustive: > > 1. Fedora Policy (Which I imagine is based on the technical foundation of > the following 5+ points and others I'm unaware of). I said "technical" so lets take policy aside ... > 2. Many packages assume a native execution environment which will not exist. > Incredible undertaking to move 11000 packages to cross compilation > framework. qemu? Should be still faster then doing the whole build on arm. > 3. Absence of arm-linux cross compilers in the distribution. Err yeah but nothing that can't be fixed. > 4. If there were arm-linux cross compilers, how do you keep them in sync > with native gcc? Build from the same srpm. > 5. Where does the sys-root for an arm-linux cross compiler come from? > 6. Would koji then be native/cross ambidextrous? Who is going to do that? No real answers to them yet but fixing them seems to be easier then "make arm as fast as x86_64". > For all these reasons and more we're not proposing cross compilation for > ARM. Just doing so defies what it means to be PA. We should somehow define what a PA is then. I wouldn't have added "built on native hardware" because that does not really seem to matter. > >> The hardware is way slower ... so we can just build on faster hardware >> (x86_64). Which is the only sane way to do it. >> Trying to build on ARM directly is kind of a gimmick but nothing one >> can seriously use to build a whole operating system. (Yes it works but >> it is way to slow). > > > In couple years the hardware is going to be surprisingly comparable or > exceed to what you're see on x86, especially as the number of cores > skyrockets while the GHz continue to climb. Might be true might be not ... we are talking about the next couple of months not years. > It's not a gimmick, we're just > preparing for the future before it gets here. The only problem we face is > that those cores are in multiple CPUs so we can't 'make -j' our way out of > the build system problem. Huh? Not sure I follow here. Also I am not opposed to having ARM as PA, I just don't really think we should do it the way it is proposed here (build on hardware that is way slower then the rest of the builders). -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
