On Mon, Jun 3, 2013 at 4:41 PM, Herbert Duerr <h...@apache.org> wrote: > The __builtin_isfinite() is used for for GCC as GCC's bug 14608 [1] prevents > the common isfinite() macro from working reliably. The builtin should work > according to the gcc documentation [2]: "GCC provides fpclassify, isfinite, > isinf_sign and isnormal built-ins used with __builtin_ prefixed." > > [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14608 > [2] http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html > > Looking through gcc's sources the builtin was introduced in [3] from > 2007-7-18 for gcc 4.3. I'm afraid we'll have to check for older gcc's there > and add another case for the ifdef GCC part. > > [3] http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=126725 > > Considering that isfinite() was in the C99, C++99, SUSv3, etc standards for > almost fifteen years now it is amazing how much trouble such a two-bit > function can still introduce.
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