[Bug libstdc++/39491] [4.2/4.3 regression] symbol __signbitl@GLIBCXX_3.4 in libstdc++ exported

["jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #29 from jakub at gcc dot gnu dot org  2009-04-28 23:56 -------
The glibc macro AFAIK does:
#  define signbit(x) \
     (sizeof (x) == sizeof (float)                                            \
      ? __signbitf (x)                                                        \
      : sizeof (x) == sizeof (double)                                         \
      ? __signbit (x) : __signbitl (x))
when __NO_LONG_DOUBLE_MATH is not defined.  For long double x when sizeof
(double) == sizeof (long double) AFAIK this is folded to __signbit (x)
immediately, already in the *.original dump, at -O0 and higher, so I have no
idea how you could ever wind up calling __signbitl.  Please explain.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39491

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