Re: OpenBSD frexpl failure

[Eric Blake]

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According to Eric Blake on 12/5/2007 9:08 PM:
>>> It looks like float.in.h needs to be updated to cater for another platform
>>> with a broken <float.h>.
>> Can you try it out (change float_h.m4, float.in.h, and then run a testdir 
>> with
>> tests from frexpl, isnanl, ldexpl, floorl, ceill, roundl, truncl etc.)?
>> I have no access to an OpenBSD machine.
> 
> With this quick patch (no ChangeLog, yet), all 12 tests pass

I'm wondering if we should also add a configure-time compile test in
float_h.m4, which does the sanity check of this untested snippet:

AC_CHECK_SIZEOF([double])
AC_CHECK_SIZEOF([long double])
AC_COMPUTE_INT([variable],
  [(SIZEOF_DOUBLE == SIZEOF_LONG_DOUBLE)
   == (DBL_MANT_DIG == LDBL_MANT_DIG)], [<float.h>])

Then we could make float.in.h always be replaced if the sanity check
fails, and additionally make it robust enough to #error out (or
equivalent) for platforms where we have not ported the correct
characteristics, rather than the current scenario of silently doing
nothing about the bad <float.h>.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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