Subject: Printf routine incorrectly prints NaN for -Inf
From: "Peter Kabal" <[email-masked]>
To: <[email-masked]>
Date: Mon, 11 Nov 2002 22:11:57 -0500

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-masked] (514) 398-7130
Electrical & Computer Engineering   (514) 398-4470 (FAX)
McGill University 
3480 University, Montreal, Quebec, Canada  H3A 2A7

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