Question about ULLONG_MAX

[Holger Kiehl <Holger.Kiehl@xxxxxx>]

Hello

When compiling the following program on a Fedora 6 x86_64 system:

   #include <stdio.h>
   #include <limits.h>

   int
   main(void)
   {
      (void)printf("%llu\n", ULLONG_MAX);

      return 0;
   }

Produces the following result:

  cc longlong.c
  longlong.c: In function 'main':
  longlong.c:7: error: 'ULLONG_MAX' undeclared (first use in this function)
  longlong.c:7: error: (Each undeclared identifier is reported only once
  longlong.c:7: error: for each function it appears in.)

If I compile it with cc -std=c99 longlong.c it works.

Why is it necessary to specify -std=c99? If I use for example strtoull()
I do not need to set -std=c99.

Compiling the above on AIX compiles and runs without problems. Also
on an older Solaris 8 system using gcc (3.3.2) it compiles and runs
straight out of the box.

If I want to use ULLONG_MAX how can I do this in a portable way so it
compiles on different systems?

Thanks,
Holger

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