preprocessor/5806: The preprocessor evaluates expression s in 64-bit, violating IS C++ 16.1.4

['Zack Weinberg']

The following reply was made to PR preprocessor/5806; it has been noted by GNATS.

From: 'Zack Weinberg' <zack@codesourcery.com>
To: "Dana, Eric" <Eric_Dana@bmc.com>
Cc: 'Neil Booth' <neil@daikokuya.demon.co.uk>,
	"'gcc-gnats@gcc.gnu.org'" <gcc-gnats@gcc.gnu.org>,
	"Schoeller, Dick" <Dick_Schoeller@bmc.com>
Subject: Re: preprocessor/5806: The preprocessor evaluates expression s in 64-bit, violating IS C++ 16.1.4
Date: Thu, 14 Mar 2002 15:14:39 -0800

 On Thu, Mar 14, 2002 at 02:58:41PM -0600, Dana, Eric wrote:
 > Zack,
 > 
 >    Is there anything that can be done for 3.1? In it's present state,
 >    Dynix cannot work properly as many of its include files test for
 >    32/64 bit using the preprocessor. For example:
 > 
 > 	#if ((~0UL) == 0xffffffffUL)
 > 	typedef unsigned int    size_t;         /* ILP32 size_t */
 > 	#else /* ((~0UL) == 0xffffffffUL) */
 > 	typedef unsigned long   size_t;         /* LP64 size_t */
 > 	#endif /* ((~0UL) == 0xffffffffUL) */
 
 In the short term, a fixincludes hack is probably the right move.  GCC
 almost certainly provides a predefined macro that you can use to
 detect the mode you're in -- tell me the output of config.guess and I
 can figure out what it should be.  Then you have fixincludes look for
 that #if and change it to an appropriate test of the macro.
 
 zw