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curmudgeon
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PostPosted: Sat May 18, 2013 10:27 am    Post subject: getting started with crossdev Reply with quote

Want to install crossdev to take the compiling work off of older machines.

Search for "gentoo crossdev" - first link is: http://www.gentoo.org/proj/en/base/embedded/cross-development.xml

Last updated 20060822.

"This guide is outdated by the Embedded Handbook. Please use that from now on."

OK, go to: http://www.gentoo.org/proj/en/base/embedded/handbook/

Installed crossdev.

Based on this page: http://www.gentoo.org/proj/en/base/embedded/handbook/index.xml?part=1&chap=2, I tried selecting the target:

Code:

# crossdev -S -v -t i686-pc-linux-gnu
------------------------------------------------------------------------------------------------------------------------------------
 * crossdev version:      20120721
 * Host Portage ARCH:     amd64
 * Target Portage ARCH:   x86
 * Target System:         i686-pc-linux-gnu
 * Stage:                 4 (C/C++ compiler)
 * ABIs:                  default

 * binutils:              binutils-[stable]
 * gcc:                   gcc-[stable]
 * headers:               linux-headers-[stable]
 * libc:                  glibc-[stable]

 * CROSSDEV_OVERLAY:      /usr/local/portage
 * PORT_LOGDIR:           /var/log/portage
 * PORTAGE_CONFIGROOT:   
 * Portage flags:          -v
  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -  _  -  ~  -

 * please convert /etc/portage/package.env to a directory
 * If you file a bug, please attach the following logfiles:
 * /var/log/portage/cross-i686-pc-linux-gnu-info.log


Side question - how do I move CROSSDEV_OVERLAY to a different directory?

Nothing is mentioned about converting /etc/portage/package.env to a directory (I don't even like the idea behind /etc/portage/package.env - it seems like a kludge to overcome non-working implementations of the way other /etc/portage files should work).

The next chapter (http://www.gentoo.org/proj/en/base/embedded/handbook/index.xml?part=1&chap=3) has a link to a crossdev guide:

http://www.gentoo.org/proj/en/base/embedded/handbook/cross-compiler.xml

Looks like an older version of chapter two (why does chapter three refer there instead of to chapter two?). Last updated 20100413, and still nothing about /etc/portage/package.env.

The documentation that comes with the crossdev itself seems (to put it mildly) lacking.

Is there any documentation that describes how to get this to work?
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Maitreya
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PostPosted: Sat May 18, 2013 11:41 am    Post subject: Reply with quote

Foreach "package.*" files in /etc/portage :

mv /etc/portage/package.keywords /etc/portage/mykeywordsfile
mkdir /etc/portage/package.keywords
mv /etc/portage/mykeywordsfile /etc/portage/portage.keywords/mykeywordsfile

etc.

This way you can have several different configs and is required for crossdev to work I guess.
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curmudgeon
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PostPosted: Sun May 19, 2013 2:04 am    Post subject: Reply with quote

What the heck is "mykeywordsfile" (I assume that is not literal)?

And how do I move the crossdev overlay out of /usr/local/portage/?
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curmudgeon
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PostPosted: Wed May 22, 2013 8:49 am    Post subject: Reply with quote

Can anyone help with this?
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cwr
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PostPosted: Thu May 23, 2013 10:30 am    Post subject: Reply with quote

The current crossdev requires /etc/portage to contain directories, not
files, so the /etc/portage layout becomes in part:
Code:

env:
  cross-armv7-none-linux-gnueabi
  cross-avr
package.env:
  cross-armv7-none-linux-gnueabi
package.keywords:
  cross-armv7-none-linux-gnueabi
  keywords
package.mask:
  cross-armv7-none-linux-gnueabi
  mask
package.use:
  cross-armv7-none-linux-gnueabi
  use

(Some of the cross-avr files are apparently missing because that cross-compiler
was built with crossdev < 2012)

My notes on the x86 => AVR cross-compiler say:
Code:

Tue Mar  6 10:26:51 GMT 2012
The crossdev avr standard build is:
 USE="-openmp" crossdev -t avr -s4 -S --without-headers
which defaults to:
  sys-devel/binutils:       2.21.1-r1
  sys-devel/gcc:            4.5.3-r1
  dev-embedded/avr-libc:    1.6.2
and gives the error:
  avr-libc-1.6.2/temp/ccGsIBs6.s: Error: .size expression for strlcat_P
  does not evaluate to a constant
Building the package with:
  USE="-openmp" crossdev --target avr --gcc 4.5.3-r1 --binutils 2.21.1-r1 \
  --libc 1.6.8 --without-headers
works ok, although the man pages end up scattered. However, the compiler
fails to build correct binaries. Use the arduino version for now.

Wed May 16 11:41:04 BST 2012
Used crossdev to remove and rebuild the avr-gcc compiler after adding the
R20 patch, which seemed to install ok.

Fri Jun 15 11:03:03 BST 2012
AVR cross-compiler patches:
    Patch crossdev Bug 147155 attachment 308991 (avr-multilib.patch)
                   Bug 147155 attachment 309069 (avr-ldscripts-symlink.patch)
                   Bug 147155 attachment 309071 (ebuild)
    Overlaps with  Bug 378387 attachment 285901 (crossdev-378387_2.patch)
    Patch portage  Bug 406765 (toolchain.eclass, hand patched)
    Patch gcc      Bug 377039 attachment 294749 (gcc-005-constructor.patch)
    Patch Arduino Ethernet library (W5100)

Updated crossdev-20111118.ebuild with crossdev-378387_2.patch.
Hand-patched /usr/portage/eclass/toolchain.eclass with:
    http://sources.gentoo.org/eclass/toolchain.eclass?r1=1.523&r2=1.524
Updated gcc-4.5.3-r1 (NB. not -r2) with gcc-005-constructor.patch.

Sat Feb 23 13:50:42 GMT 2013
All the 2012 crossdevs require /etc/portage to contain directories, not files,
so reverted to 20111118 (20111221 should also work).  However, gcc 4.5.3 has
been updated, so the final build was:
  USE="-openmp" crossdev --target avr --gcc 4.5.3-r2 --binutils 2.21.1-r1 \
  --libc 1.6.8 --without-headers

There is still a warning:
  !!! WARNING - Cannot auto-configure CHOST avr
  !!! You should edit /usr/avr/etc/portage/make.conf
  !!! by hand to complete your configuration
    * Log: /var/log/portage/cross-avr-binutils.log

For the x86 => arm cross-compilation, using the new directory layout,
see my posts http://forums.gentoo.org/viewtopic-t-959172.html

Good luck - Will
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curmudgeon
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PostPosted: Fri May 24, 2013 2:20 am    Post subject: Reply with quote

cwr wrote:
The current crossdev requires /etc/portage to contain directories, not
files, so the /etc/portage layout becomes in part:


The formatting there was confusing. I also have a question about Maitreya's comment. Do I need to create make.conf files in each directory as well?

Can you paste the output of "ls -Ral /etc/portage" (I think that would help a lot)?

cwr wrote:
For the x86 => arm cross-compilation, using the new directory layout,
see my posts http://forums.gentoo.org/viewtopic-t-959172.html


That did not seem straight forward at all (but thanks for posting it - I guess I will just have to trudge through it).
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cwr
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PostPosted: Fri May 24, 2013 8:15 am    Post subject: Reply with quote

At the moment you (probably) have a file package.use in /etc/portage. Rename it to
eg: "use", and make a directory /etc/portage/package.use. Then move the /etc/portage/use
file to the directory /etc/portage/package.use. Repeat the trick for package.keywords,
package.env, and package.mask (if they aren't already directories).

Crossdev does a lot of messing around; I generally find it easiest to let it do whatever
it wants, and then go around afterwards with a spiked stick and clean up the litter.

Reference the arm build posting, all you have to do is _fetch_ (not install) gcc-4.7x,
and then run the crossdev command I listed in footnote B. It's worked a couple of times
for me now, so you should be ok.

Will
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steveL
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PostPosted: Fri May 24, 2013 10:56 am    Post subject: Reply with quote

cwr wrote:
Crossdev does a lot of messing around; I generally find it easiest to let it do whatever
it wants, and then go around afterwards with a spiked stick and clean up the litter.

Have you tried it with PORTAGE_CONFIGROOT?
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curmudgeon
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PostPosted: Fri May 24, 2013 9:47 pm    Post subject: Reply with quote

cwr wrote:
At the moment you (probably) have a file package.use in /etc/portage. Rename it to
eg: "use", and make a directory /etc/portage/package.use. Then move the /etc/portage/use
file to the directory /etc/portage/package.use. Repeat the trick for package.keywords,
package.env, and package.mask (if they aren't already directories).


THAT certainly seems easy enough to follow, but I thought the whole purpose of this exercise was to allow different package files for each target architecture. If I just have one package.use file in the directory, it doesn't seem to have added much. :)

And what about make.conf? Isn't there generally different settings for each target architecture? I suppose some of the differences could go into files such as package.use (but I still don't see how to specify different package.use files for each target).
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cwr
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PostPosted: Sat May 25, 2013 8:17 am    Post subject: Reply with quote

curmudgeon wrote:

And what about make.conf? Isn't there generally different settings for each target architecture? I suppose some of the differences could go into files such as package.use (but I still don't see how to specify different package.use files for each target).


Look under /etc/portage/env/whatever (after running crossdevl, which seems to set up that directory).

Will
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