Brown, Daniel wrote:
>Unfortunately our build system is automated and not particularly agile, it can
>be done but it would be preferred not to have to do that and to replace the
>offending function instead but I've never had to write a IsNaN test.
>
>
>
I had a look at the sourcecode for sqlite3IsNaN():
SQLITE_PRIVATE int sqlite3IsNaN(double x){
/* This NaN test sometimes fails if compiled on GCC with -ffast-math.
** On the other hand, the use of -ffast-math comes with the following
** warning:
**
** This option [-ffast-math] should never be turned on by any
** -O option since it can result in incorrect output for programs
** which depend on an exact implementation of IEEE or ISO
** rules/specifications for math functions.
**
** Under MSVC, this NaN test may fail if compiled with a floating-
** point precision mode other than /fp:precise. From the MSDN
** documentation:
**
** The compiler [with /fp:precise] will properly handle comparisons
** involving NaN. For example, x != x evaluates to true if x is NaN
** ...
*/
#ifdef __FAST_MATH__
# error SQLite will not work correctly with the -ffast-math option of GCC.
#endif
volatile double y = x;
volatile double z = y;
return y!=z;
}
So it looks as if you have little choice. I'd say, Mike's suggestion is the
least painful.
Regards,
Arjen
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