[Octave-bug-tracker] [bug #40560] a < b incorrect for complex numbers on MinGW

[Rik]

Follow-up Comment #3, bug #40560 (project octave):

More of the history is comping back now.  I think we added the
--float-truncate option specifically for Tatsuro who was doing Windows builds
at the time.  Here is the excerpt from configure.ac.


### When compiling math for x87, problems may arise in some code comparing
### floating-point intermediate results.
### Generally, it helps to store the result in a local volatile variable,
### but it also degrades performance.
### Thus, we provide a FLOAT_TRUNCATE macro that may be defined to "volatile"
### when compiling for x87 target, or left empty for modern SSE math, that
### doesn't suffer from this problem at all.
AC_ARG_ENABLE([float-truncate],
  [AS_HELP_STRING([--enable-float-truncate],
    [enables truncating intermediate FP results.])],
  [if test "$enableval" = yes; then
     ac_float_truncate=volatile
   else
     ac_float_truncate=
   fi],
  [ac_float_truncate=])



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