The change that Igor snuck into #3166 was speculative at best.  GDC supports targets with 128bit long double, and on i386 and x86_64 you can control the ABI of 64bit long double size with ``-m128bit-long-double``, ``-m96bit-long-double``, ``-mlong-double-64``, and  ``-mlong-double-80``.  Which reminds me, need to make four separate builds some day to test std.math unittests. :-)