iconv without "wchar_t" as a conversion name

iconv without "wchar_t" as a conversion name

[Paul Koning]

NetBSD has iconv support, essentially the same as in glibc, with one
crucial difference that messes up GDB.

In gdb_wchar.h, INTERMEDIATE_ENCODING is hardcoded as "wchar_t" and in
charset.c iconv_open() is called with INTERMEDIATE_ENCODING as the "to"
format.

As it happens, the NetBSD implementation of iconf does not list
"wchar_t" as a format it knows, though it does have a very long list of
supported formats that looks otherwise quite similar to what iconv on,
say, Linux supports.

I assume "wchar_t" means "whatever character format is the native
encoding of a wchar_t data type".  If so, it looks like "ucs-4" would be
a valid replacement, since wchar_t maps to int on NetBSD.  This suggest
that INTERMEDIATE_ENCODING should be determined by configure instead of
being hardcoded.

Does this make sense?  I can work on a patch, though hints on how to do
this in configure would be welcome since I'm a beginner in that space.

	paul 

RE: iconv without "wchar_t" as a conversion name

[Pierre Muller]

  I already tried to propose a patch going in the direction you
indicate, but the replies were not very positive...

See
http://sourceware.org/ml/gdb-patches/2010-04/msg00719.html

Pierre Muller
Pascal language support maintainer for GDB


> -----Message d'origine-----
> De : gdb-owner@sourceware.org [mailto:gdb-owner@sourceware.org] De la
> part de Paul Koning
> Envoyé : Tuesday, May 04, 2010 2:16 PM
> À : gdb@sourceware.org
> Objet : iconv without "wchar_t" as a conversion name
> 
> NetBSD has iconv support, essentially the same as in glibc, with one
> crucial difference that messes up GDB.
> 
> In gdb_wchar.h, INTERMEDIATE_ENCODING is hardcoded as "wchar_t" and in
> charset.c iconv_open() is called with INTERMEDIATE_ENCODING as the "to"
> format.
> 
> As it happens, the NetBSD implementation of iconf does not list
> "wchar_t" as a format it knows, though it does have a very long list of
> supported formats that looks otherwise quite similar to what iconv on,
> say, Linux supports.
> 
> I assume "wchar_t" means "whatever character format is the native
> encoding of a wchar_t data type".  If so, it looks like "ucs-4" would
> be
> a valid replacement, since wchar_t maps to int on NetBSD.  This suggest
> that INTERMEDIATE_ENCODING should be determined by configure instead of
> being hardcoded.
> 
> Does this make sense?  I can work on a patch, though hints on how to do
> this in configure would be welcome since I'm a beginner in that space.
> 
> 	paul