LONG_MAX on Solaris / gcc 2.95.2 (was: [gmp 4] Output line too long.)

[Vincent Lefevre]

On 04 Dec, Vincent Lefevre <address@hidden> wrote:
> In fact, no. If I compile a simple example with gcc, there is no
> problem. But if I use GMP's Makefile (on the same example), I get
> an integer overflow. So, the problem seems to be in GMP. I'll try
> to see where...

After some tests, the problem is due to the option -mcpu=ultrasparc,
which selects -D__sparc_v9__ for cpp. With the -E option, I get for
ULONG_MAX:

  (9223372036854775807L   * 2UL + 1)

On the machine, <limits.h> is

  /usr/local/lib/gcc-lib/sparc-sun-solaris2.6/2.95.2/include/limits.h

which contains

#ifndef __LONG_MAX__
#if defined (__alpha__) || defined (__sparc_v9__) || defined (__sparcv9)
#define __LONG_MAX__ 9223372036854775807L
#else
#define __LONG_MAX__ 2147483647L
#endif /* __alpha__ || sparc64 */
#endif

__LONG_MAX__ is used to define LONG_MIN, LONG_MAX and ULONG_MAX, but
it is incorrectly set. A fix would be to compile with

  -D__LONG_MAX__=2147483647L

I now get (2147483647L   * 2UL + 1) for ULONG_MAX, as expected.

-- 
Vincent Lefèvre <address@hidden> - Web: <http://www.vinc17.org/> - 100%
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Work: CR INRIA - computer arithmetic / SPACES project at LORIA