Re: [gentoo-alt] Crossdev in a prefix / bug 384167

[Greg Turner]

On Mon, Jun 10, 2013 at 1:04 PM, Jason Cooper <gentoo@××××××××××.net> wrote:
> Sorry, resending for the list.  forgot to swap aliases...
>
> On Mon, Jun 10, 2013 at 12:27:59PM -0700, Greg Turner wrote:
>> On Mon, Jun 10, 2013 at 4:16 AM, Jason Cooper <gentoo@××××××××××.net> wrote:
>> > On Mon, Jun 10, 2013 at 03:17:44AM -0700, gmt@×××××.us wrote:
>> > > I have crossdev starting to work in a prefix, via an overlay.
>> [snip]
>> > I'd be particularly interested on building arm and powerpc toolchains on
>> > OSX.
>>
>> Most likely these will require additional patching to sys-libs/uclibc
>> or whatever ELIBC corresponds to your particular targets/ARCH's of
>> interest.  Indeed, a quick test of crossdev
>> =cross-arm-linux-uclibc/uclibc-0.9.33.2-r4 confirms this ("Aborting
>> due to QA concerns: there are files installed outside the prefix").
>
> The C library isn't that critical to me, but it would eventually be
> useful.  On my gentoo system I currently have
>
>   arm-none-linux-gnueabi
>   powerpc-none-linux-gnueabi
>   i586-pc-linux-gnu

Unfortunately the libc ebuild is a semi-required part of the crossdev
build process, which makes sense when you consider that the gcc build
system needs to know how to link, i.e., libstdc++.a.

> I'd previously tried to do gentoo prefix on my macbook air as a
> replacement for macports and to get crossdev.  Didn't work out so well.
> :-/

Well you know what they say, 3333rd time's the charm :)

>> You sound like you have some real-world uses for this, Jason --
>
> I primarily putz around with kernel and bootloader development.  Which
> is why I'm not too worried about the C library.

For these purposes you might be able to get away with letting crossdev
build the stage1 gcc and then fail.  Even so, it's probably not
terribly hard to fix the libc stuff, and regardless, clearly, such
efforts fall under the general umbrella of "tasks needed to make
crossdev work in a prefix".

>> perhaps, once I have an overlay set up, you could do some
>> guinea-pigging for me?
>
> No problem, I can switch the MBA back to gentoo prefix if it means I
> might get crossdev on it ;-)

Groovy.  Unfortunately, ATM, I don't have access to any reasonable
bare-metal computers and am doing all my Gentoo development on the
gcc-compile-farm boxes via my surprisingly usable 8-year-old
ultrabook... anyhow, once I get back online with a real computer, I
can spin up an OSX vm, which should help tremendously with this --
although, admittedly, were it not for being forced to do everything on
the gcc-compile-farm, I probably wouldn't have gone to all this
trouble in the first place (A huge thank you is due to the gcc farm
and fsffrance for providing an amazing resource... I'd be dead in the
water, without them, while I sort out my ongoing perfect storm of --
not exaggerating -- quadruple simultaneous motherboard failures).

> I will have to put my trees into a dmg that is case-sensitive *and*
> case-preserving, by default OSX root filesystem isn't.

fyp, I've been playing with various windows ARCH's for a while and
have managed to break more than a few Windows installations by turning
on case-sensitivity.  Wish I'd thought of sticking it in a loopback
filesystem (which is what I presume you describe above) -- I probably
could have saved many lost hours that way.  Actually I'm surprised to
hear that OSX doesn't have case-sensitivity by default, given it's
BSDish roots.

>> Can you share some particulars of your use-case (bearing in mind that
>> I haven't played with embedded for quite a while and might not know
>> some things that seem quite obvious to someone who, i.e., owns a
>> raspberry pi or an android phone)?
>
> I primarily build kernels for the Marvell line of SoCs.  Kirkwood, dove,
> and new Armada.  Occasionally, omap.  You can find the Marvell SoCs in a
> lot of consumer-grade NAS's, and omap is in the Beaglebone Black, and a
> bunch of other stuff.
>
> Once you get an overlay acct, let me know what it is and I'll test away.

Will do, thanks in advance!  I may also bug you again to help decode
some of the above ;)  Thankfully I do at least still have access to
Google.

> If you haven't already, you may want to Cc Mike Frysinger
> (vapier@g.o), as he may be able to offer pointers on crossdev.
> He did write it and all. :)

ACK, although I think he reads or at least skims gentoo-alt.
Certainly, once I'm able to coherently ask for an evaluation of the
specific changes I've made to =sys-devel/crossdev-99999999, I'll make
sure he's aware of it.

-gmt