Re: clang support

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

> 4. More Autoconf
> 
> Worse than 3., cross/avr-{gcc,binutils} not only have broken configure 
> scripts, but also insist on autoconf 2.59. Any auto* experts around knowing 
> how to fix this?
OK, this turned out to be an issue different from 3.
The libiberty configure script goes into great lengths finding the correct 
value for ac_c_preproc_warn_flag and afterwards unconditionally sets it to 
true. Setting CC=clang -Qunused-arguments helps (setting CFLAGS doesn't help 
because they are overridden in the pkgsrc Makefile -- why?).
It still doesn't build, but I will continue working on it.