$ cat strtod_test.c
#include <stdio.h>
#include <stdlib.h>
#include <fenv.h>

main ()
  /* The following number comes from /usr/share/asymptote/ode.asy.  */
  const char *str = "121645100408832000.0";
  char *ptr;

  feenableexcept (FE_INVALID);
  strtod (str, &ptr);

  /* If there was an exception, the following will not get executed.  */
  printf ("No exception.\n");

$ gcc strtod_test.c

$ ./a
Floating point exception (core dumped)

[The above was on x86.  On x86_64 there's simply no output.]

I have no idea what's special about the number 121645100408832000.0, but the problem goes away if, for example, I replace the leading 1 by 2.


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