Re: Printf routine incorrectly prints NaN for -Inf
On Mon, Nov 11, 2002 at 10:11:57PM -0500, Peter Kabal wrote:
>gcc version 3.2 20020818 (prerelease)
>
>printf ("%g", log(0));
>
>This prints "NaN" instead of "-Inf" as it should (and did in the past).
>A check of the bit pattern returned shows that that log(0) returns a bit
>pattern corresponding to "-Inf", but printf prints "NaN" instead.
>
>I am not sure which C library is being used (a bug report to gcc folks
>got the response that newlib is the culprit). However, the compiler
>option -print-libgcc-file-name tells me it is looking for libgcc.a. So I
>am confused as to who to report the bug to.
Perhaps unsurprisingly, the gcc folks are correct. It's a newlib bug.
The newlib mailing list is newlib at sources dot redhat dot com .
cgf
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Printf routine incorrectly prints NaN for -Inf
gcc version 3.2 20020818 (prerelease)
printf ("%g", log(0));
This prints "NaN" instead of "-Inf" as it should (and did in the past).
A check of the bit pattern returned shows that that log(0) returns a bit
pattern corresponding to "-Inf", but printf prints "NaN" instead.
I am not sure which C library is being used (a bug report to gcc folks
got the response that newlib is the culprit). However, the compiler
option -print-libgcc-file-name tells me it is looking for libgcc.a. So I
am confused as to who to report the bug to.
Peter Kabal [EMAIL PROTECTED] (514) 398-7130
Electrical & Computer Engineering (514) 398-4470 (FAX)
McGill University
3480 University, Montreal, Quebec, Canada H3A 2A7
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