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preprocessor/5807: The preprocessor evaluates expression s in 64-bit, violating IS C++ 16.1.4
- From: eric_dana at bmc dot com
- To: gcc-gnats at gcc dot gnu dot org
- Cc: dick_schoeller at bmc dot com
- Date: 1 Mar 2002 20:16:17 -0000
- Subject: preprocessor/5807: The preprocessor evaluates expression s in 64-bit, violating IS C++ 16.1.4
- Reply-to: eric_dana at bmc dot com
>Number: 5807
>Category: preprocessor
>Synopsis: The preprocessor evaluates expression s in 64-bit, violating IS C++ 16.1.4
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Mar 01 12:26:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Eric Dana
>Release: GCC 3.0.4 and possibly GCC 3.1
>Organization:
>Environment:
AIX, Solaris, Sequent and others
>Description:
The preprocessor evaluates expressions using 64-bits, violating ISO C++ 16.1.4 and 5.19. The problems is generic and can be easily reproduced. This causes the 32/64 bit test on Sequent provided header files to be incorrectly parsed.
The vendor compilers work according to the standard.
>How-To-Repeat:
On Solaris (64-bit):
cc ed.c
a.out
cc -xarch=v9 ed.c (64-bit build)
a.out
gcc ed.c
a.out
On all OS's:
cc ed.c
a.out
gcc ed.c
a.out
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="ed.c"
Content-Disposition: inline; filename="ed.c"
#if 0
#if ((~0UL) == (0xffffffffUL))
#define MYSIZESTRING "32 bit"
#else
#define MYSIZESTRING "64 bit"
#endif
#endif
#define MYSIZESTRING "foo"
#include <stdio.h>
main ()
{
printf("sizeof long = %d\n", sizeof(long));
printf("C preprocessor thinks the size is: %s\n", MYSIZESTRING);
}