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From: "jmuizelaar at mozilla dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/48379] New: -Wdouble-promotion warns for promotion by varargs
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48379

           Summary: -Wdouble-promotion warns for promotion by varargs
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jmuizelaar@mozilla.com


The following program gives a warning about double promotion:

#include <stdio.h>
void
p()
{
    float q = 5;
    printf("%g\n", q);
}

Since, there's not much that can be done to fix this situation it's probably
not worth warning about. Alternatively, a switch could be added to avoid the
warning spam.