[Bug libstdc++/31836] [4.3 Regression] FAIL: 27_io/basic_istream/extractors_arithmetic/char/12.cc execution test

["amylaar at spamcop dot net" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #32 from amylaar at spamcop dot net  2007-05-14 16:39 -------
Subject: Re:  [4.3 Regression] FAIL:
        27_io/basic_istream/extractors_arithmetic/char/12.cc execution test

Quoting pcarlini at suse dot de <gcc-bugzilla@gcc.gnu.org>:

>
> safely when the target doesn't have infinities. Therefore, I would ask you to
> untangle a bit this thing... Apparently, for some reason, for your target
> onte
> of the checks (which one? !finitef? !finite?) is not working, instead the
> final
> f != __builtin_huge_valf() catches it.

These are excepts from
arc-elf32/arc700/libstdc++-v3/include/arc-elf32/bits/c++config.h:

/* Define to 1 if you have the `finitef' function. */
/* #undef _GLIBCXX_HAVE_FINITEF */
/* Define to 1 if you have the `_finitef' function. */
/* #undef _GLIBCXX_HAVE__FINITEF */
/* Define to 1 if you have the `finite' function. */
/* #undef _GLIBCXX_HAVE_FINITE */
/* Define to 1 if you have the `_finite' function. */
/* #undef _GLIBCXX_HAVE__FINITE */
/* Define to 1 if you have the `isinf' function. */
/* #undef _GLIBCXX_HAVE_ISINF */
/* Define to 1 if you have the `_isinf' function. */
/* #undef _GLIBCXX_HAVE__ISINF */

Thus, the test that should be performed in
_ZSt14__convert_to_vIfEvPKcRT_RSt12_Ios_IostateRKPi should be:

      if (fabs(__d) > numeric_limits<float>::max())
        errno = ERANGE;

Disassembly of that method shows that the test has been
optimized away.
This is not actually surprising, because _GLIBCXX_HAVE_STRTOF
has been set, and hence strtof has been used, and
__d remained uninitalized.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31836