[v3] use AM_ICONV

[Marco Trudel]

Benjamin Kosnik wrote:
> 
>> How to disable iconv now? Is it now always required?
> 
> Yeah.

Ok, if it's now a requirement, then it should be added to 
http://gcc.gnu.org/install/prerequisites.html. Because it isn't there, I 
assumed that configure fails detecting if it is available or not.


> I suppose adding _GLIBCXX_HAVE_ICONV guards in include/ext/enc_filebuf.h 
> and include/ext/codecvt_specializations.h may be necessary, or these two 
> files should be dropped from the extc++.h pre-compiled header file.

Well, if it is a requirement now, I will see that I have it...


thanks
Marco