[gentoo-soc] Gentoo on Android, Summary for 2013.6.28-7.1

[heroxbd <heroxbd@gmail.com>]

Dear Guys and Gals,

Gentoo on Android is about running Gentoo natively in a directory prefix
on Android devices[1] in parallel with native Android, mentored by Luca.

Progress report for the past 3 days,

     1. gcc specs hack is not that interesting as it first looks.
        - parsing or generating specs script is no fun.
          The best parser/generator is gcc itself
        - appending simple specs (suches -dynamic-linker=/xx/xx.so) feel
          not clever, appending --with-spec to configure either.

        Therefore, I decide not to use specs hack as the main building
        block. At the same time, it can be handy to do manual tuning
        with it.
     
        Relying on binutils wrapper is no good either. The solution
        finally falls on a mixed one between sysroot and native paths
        methods (ref. table in [2]). Where I make use of eprefixify of
        prefix.eclass to modify location of dynamic linker for *run
        time* and sysroot for *compile time*.

     2. Prefix/libc armhf works rock solid. It is now being "emerge -e
        @world" with the help of many distcc cross compilers. I have to
        leave my cell phone home for a constant power supply and
        ethernet connection (yes! USB ethernet adapter) though.

     3. A problem on RHEL 5.6 made me question how far could I go with
        ancient GNU/Linux environments. 

        gcc bootstrap fails horribly in stage2

,----
| /dev/shm/portage/sys-devel/gcc-4.7.2-r1/work/build/gcc $ ./cc1
| cc1: internal compiler error: Segmentation fault
| Please submit a full bug report,
| with preprocessed source if appropriate.
| See <http://bugs.gentoo.org/> for instructions.
`----

        The bug is related to VDSO. A full description of the problem is
        on stackoverflow[3]. I'd be very appreciated for any hints.

So much for today. Cheers!
Benda

1. http://www.awa.tohoku.ac.jp/~benda/projects/android.html
2. http://wiki.gentoo.org/wiki/Prefix/libc
3. http://stackoverflow.com/questions/17406389/is-it-possible-to-turn-off-vdso-on-glibc-side