[Bug math/22243] New: log2(0) and log10(0) are wrong in downward rounding without the svid compat wrapper

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22243

            Bug ID: 22243
           Summary: log2(0) and log10(0) are wrong in downward rounding
                    without the svid compat wrapper
           Product: glibc
           Version: 2.27
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
  Target Milestone: ---

log2(0) and log10(0) return inf instead of -inf in downward rounding when the
svid wrapper is suppressed (static linking, new targets).

#include <math.h>
#include <stdio.h>
#include <fenv.h>

int main()
{
        fesetround(FE_DOWNWARD);
        double y1 = log2(0);
        double y2 = log10(0);
        fesetround(FE_TONEAREST);
        printf("%a\n", y1);
        printf("%a\n", y2);
}

prints

inf
inf

with static linking.

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