Hi Bruno,
Bruno Haible <br...@clisp.org> writes:
> What's the result when you compile it with cc?
> $ cc foo.c -lm
> $ ./a.out
> $ echo $?
1
That's with "Compaq C V6.5-303 (dtk) on Compaq Tru64 UNIX V5.1B
(Rev. 2650)".
Should we conclude that this is a GCC bug? I'll try with different
versions.
> What's the result for a program that uses a quiet NaN, computed
> differently?
>
> #include <math.h>
> double zero = 0.0;
> int main()
> {
> return isnan (zero / zero);
> };
SIGFPE with both `cc' and GCC 4.0.2.
> And finally, what's the hexdump of that DQNAN constant?
>
> #include <math.h>
> #include <stdio.h>
> int main()
> {
> printf("%04X%04X\n", DQNAN[1], DQNAN[0]);
> return 0;
> }
FFF800000000
Quite different from what we have on GNU in <bits/nan.h>...
Thanks,
Ludo'.
