unable to build upstream gcc due to multiarch setup (bits/predefs.h: No such file or directory)

[Daniel Franke]

Since the change to multiarch, building upstream gcc is broken on Debian and Ubuntu 11.10. There are a load of reports at bugs.debian.org and a proposed patch from Matthias Klose over at gcc-patches. However, the former are not sorted out and the latter is not applied (yet).

How to reproduce: check out gcc from svn, try to build according to documentation.
Result:
[...]
In file included from /usr/include/stdio.h:28:0,
                 from /home/daniel/svn/gcc-4.6/libgcc/../gcc/tsystem.h:87,
                 from /home/daniel/svn/gcc-4.6/libgcc/../gcc/libgcc2.c:29:
/usr/include/features.h:323:26: fatal error: bits/predefs.h: No such file or directory

On my system, the file is here:
  /usr/include/i386-linux-gnu/bits/predefs.h

Reports at Debian (I got lost trying to sort out which one is THE report):
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=644986
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=637232
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=639214
  [...]

Multiarch patch from Debain Maintainer (maybe someone could push this?):
  http://gcc.gnu.org/ml/gcc-patches/2011-08/msg01674.html

Thinking I switched from Gentoo to Ubuntu hoping to avoid this constant struggle uphill ... ha!

[Ubuntu Foundations Team Bug Bot (crichton)]

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[Matthias Klose (doko)]

nothing to track in Ubuntu