Re: gawk 3.1.5h test results on interix

[Aharon Robbins]

In article <address@hidden> you write:
>> It would appear that your library doesn't distinguish negative and
>> positive NAN values.
>> Is that true?
>
>Yes, I verified that now. Interix libc printf doesn't distinguish 
>between NaN and -NaN, it always prints "NaN".

OK, good to know I wasn't far off.

>> Andy:
>> This seems rather bewildering to me (that 'sprintf("%f",-nan)' 
>> returned '-NaN' in the first instance inside BEGIN, but then behaved 
>> differently inside the display function).  I hope that I'm reading 
>> the code improperly. Does anybody else understand what's going on 
>> here?
>
>But Andy is also right. NaN or -NaN isn't the problem, the test 
>compensates for it. The real problem is that log(0) isn't -Inf but NaN 
>for me. The reason is, however, the libm I'm using. If I use the 
>system libm, everything is fine, also the tweakfld test. The system 
>libm has other problems with single precision floats, that's why I'm 
>now using libm from newlib.
>
>Unfortunaly, newlib's libm has a bug which I just found now. For 
>log(0) the docs says it returns -Inf, but the source says it returns 
>NaN.
>
>Thank you both.
>
>On Interix there is a problem with "long double", for details see:
>http://www.debian-interix.net/techdocs/#ldbl
>
>Apparently, this is not the case here, but just to verify: Does gawk 
>make use of "long double" anywhere, besides in the configure script?
>
>Martin

Gawk uses plain double. It doesn't use float or long double, so it sounds
like you're safe using the system libm.

Thanks!

Arnold
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