Re: [Patches] Update on the Cross-building instructions

On Thu, Mar 14, 2013 at 6:34 AM, Carlos O'Donell <carlos@xxxxxxxxxxxxxxxx> wrote:

On Tue, Mar 12, 2013 at 8:33 PM, Andrew Klofas <aklofas@xxxxxxxxx> wrote:
> Greetings,
>
> Just joined today (apologies if I don't follow the proper etiquette).
> There was a requirement at work to build a compiler that runs on an embedded
> linux ppc chipset. So, after hitting the webs for a few hours, the only
> tutorial on building a cross compiler that was remotely comprehensible was
> this one: http://www.eglibc.org/archives/patches/msg00078.html (thanks so
> much jimb!)

Nice to hear that!

> All the automated tools I could find (crosstool and crosstool-ng) were for
> sources that were woefully out of date. Additionally, I needed to build a
> "canadian cross" (hehe look it up), no easy task!

The crosstool and crosstool-NG configurations should be usable with
up-to-the-minute sources. Not to mention that crosstool-NG has no
sources per-se it just downloads them. You can build a configuration
that uses recent sources quite easily.

Well, shoot. My crosstool-ng only supported up to gcc 4.3. Now that I've gotten the latest version, it appears that you are correct.

> So up rolled my selves as I adopted jimb's directions. Here is the final
> result that seems to work for me (minimal testing so far...). Please let me
> know if there is any obvious configuration issues that stands out.
>
> The current sources I used are:
> binutils-2.23
> gcc-4.7.2
> linux-3.4.35 (headers)
> gperf-3.0.4 (not sure I really need that, but the compiler barfed without
> it)
> and finally:
> eglibc-2.14/libc (from svn)

Looks fine. I assume you only need a C compiler? I also assume you
used your local mpfr and gmp libraries for building the compiler.

Nope, I'm compiling c,c++,fortran. The mpfr/mpc/gmp libraries are downloaded using the script `gcc.../contrib/download_prerequisites`.

The ending of the script/tutorial needed a bit of work, but I think I've figured it out, so after testing I'll post the final draft.

> My build computer is:
> Linux Mint 14 x86_64
> gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
>
> And my directory structure looks like:
> ~/Build/cross/src
> |- binutils-2.23
> |- gcc-4.7.2
> |- gperf-3.0.4
> |- libc -> libc-all/libc
> |- libc-all
> |- linux-3.4.35 -> /home/aklofas/Build/linux
>
> If I get the green light from you guys/girls, I'll type up a nice article
> (or copy/paste most of jimb's article :) for the future cross-compilers
> (good luck futures!)

It would be nice to get this article onto the GNU C Library wiki here:
http://sourceware.org/glibc/wiki/.

The community is working towards merging the eglibc changes back into
glibc, so the glibc wiki is an appropriate place for this kind of
information.

Nice. I'll do that.

Cheers,
Carlos.