locale-inst.cc: Add codecvt<unicode_t...

locale-inst.cc: Add codecvt<unicode_t...

2000-08-22  Benjamin Kosnik  <bkoz@purist.soma.redhat.com>

	* src/locale-inst.cc: Add codecvt<unicode_t, wchar_t,
	__enc_traits> instantiations for has_facet and use_facet.
	* testsuite/22_locale/codecvt_unicode_wchar_t.cc: New file, for
	testing two-byte unicode encodings converted to four-byte UCS4
	encodings.

	* bits/codecvt.h (codecvt<__enc_traits>): Fix do_unshift.
	* testsuite/22_locale/codecvt_unicode_char.cc (test01): Add
	correct state/encoding information.

	* acinclude.m4 (GLIBCPP_CHECK_WCHAR_T_SUPPORT): Add wcsrtombs,
	mbsrtowcs checks as codecvt<wchar_t, char, mbstate_t> needs them
	now.
	Add checks for langinfo.h, nl_langinfo function call.
	* libio/iofwide.c (_IO_fwide): Simplify, as nl_langinfo is assumed.

From-SVN: r35897