[MLton] Build problems on Mac OS X

[Matthew Fluet]

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> > Thanks for the update.  Here's the problem:
> > 
> > unhandled exception: Fail IEEEReal.RoundingMode.fromInt
> > MLton bug: unhandled exception in Basis Library..
> > Please send a bug report to MLton@mlton.org.
> 
> I appears that  fegetround  is returning an unknown rounding mode.

Brent,

Are you still experiencing a bootstraping problem on MacOS X?  I am afraid 
that I don't have access to a MacOS X box to reproduce your problem.  I've 
included a little C program to print out the values of the various FE_* 
rounding mode macros along with the result of fegetround.  You should be 
able to compile it with:
  gcc -std=c99 -Wall -lm testfenv.c

If the result of fegetround matches one of the FE_* rounding modes, then 
that indicates a bug in MLton; otherwise, it would appear to be a bug in 
the MacOS X system libraries.
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