Re: Iconv / Solaris

[Tom Tromey <tromey at redhat dot com>]

>>>>> "Daniel" == Daniel Jacobowitz <drow@false.org> writes:

Daniel> Maybe I'm thinking about this wrong... can we determine the
Daniel> encoding of wchar_t somehow that works on Solaris?  Something
Daniel> like what we do now with nl_langinfo?

Nope.

For the "narrow" charset you can use nl_langinfo(CODESET).
There is no equivalent for the wide charset :-(

Many systems let you pass "wchar_t" to iconv_open, instead.
However, Solaris doesn't.

Daniel> Or is it not guaranteed to have any known encoding?

If the system defines __STDC_ISO_10646__, then you know it uses Unicode.

Otherwise, all bets are off.

Daniel> I'm lost in the configure maze

Yeah.  The way it works:

* If you have a fully working iconv + wchar_t suite, then:
  - All the gdb_* macros are defined as their wide counterparts,
    e.g. gdb_iswprint == iswprint
  The intermediate charset is wchar_t.

* You might have iconv but no working wchar_t support.
  In this case we use the narrow forms for everything,
  e.g., gdb_iswprint == isprint (and gdb_wchar_t == char).
  However we still use iconv for recoding.
  The intermediate charset is host_charset.

  This is the scenario I propose we make Solaris use, preferably by
  using AC_TRY_RUN to test iconv_open.
  The impact on the user is that if he tries to print a string with
  non-host-charset characters, he will get escapes -- basically what GDB
  6.8 does.

* You might have nothing at all.  This is the PHONY_ICONV case.
  In this scenario we use the narrow forms for everything and basically
  just fail unless host_charset == target_charset.

Tom