2002-11-15  Paolo Carlini  <pcarlini@unitus.it>
	    Loren J. Rittle  <ljrittle@acm.org>

	PR libstdc++/8399
	* acinclude.m4
	(GLIBCPP_CHECK_UNISTD_DECL_AND_LINKAGE_1): New macro to
	check for unistd.h functions.
	(GLIBCPP_CHECK_UNISTD_SUPPORT): New macro, check for isatty
	in unistd.h.
	* configure.in: Call here.
	* src/ios.cc (ios_base::Init::_S_ios_create(bool)):
	Use _GLIBCPP_HAVE_ISATTY: ifdef, in case of interactive
	input __in_size = 1 even when sync_with_stdio is false;
	otherwise fall back to __in_size = 1.
	* aclocal.m4: Regenerate.
	* config.h.in: Regenerate.
	* configure: Regenerate.

Co-Authored-By: Loren J. Rittle <ljrittle@acm.org>

From-SVN: r59118