[PATCH] libstdc++/8399

[Paolo Carlini]

So, finally, here it is, ready for review...

Thanks to everyone for helping me in my first work touching
the autoconf machinery!

Tested x86-linux, a testcase is in fact test03 in
narrow_stream_objects.cc, which resurfaced due to its
interactive nature. As suggested by Loren, we should learn
from gdb to add interactive tests in the v3 testsuite.

Of course, I have also checked that on linux we didn't regress
performancewise in 2211-type situations.

However, there is a risk that systems without isatty will
experience a performance regression for having 8399 fixed.

Ok?

Ciao,
Paolo

///////

2002-11-13  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.

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