preprocessor/8139: Bad new INT64_C macro

[Philippe RIBET]

The following reply was made to PR preprocessor/8139; it has been noted by GNATS.

From: "Philippe RIBET" <philippe_ribet@hotmail.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc: philippe_ribet@hotmail.com
Subject: Re: preprocessor/8139: Bad new INT64_C macro
Date: Mon, 07 Oct 2002 08:59:44 +0000

 >What is the new definition?  What is this macro?
 
 Old macro was:
 
 # if __WORDSIZE == 64
 #  define INT64_C(c)    c ## L
 # else
 #  define INT64_C(c)    c ## LL
 # endif
 
 New macro is:
 #define INT64_C(val) (INT_LEAST64_MAX-INT_LEAST64_MAX+(val))
 
 
 (in file include/stdint.h)
 
 This macro is part of ANSI C99 standard. It allows to specify integer 
 constant size.
 
 >I suspect the warnings are correct, but new, and that the definition
 of the macro is unchanged.
 No, definition changed.
 No, warnings are not correct as INT64_C(-3000000000) is valid code because 
 -3000000000 is valid 64bits integer.
 
 >You should probably add a U to the relevant numbers.
 ??? 'U' with negative numbers ???
 
 >Anyway, not a GCC bug.
 Is IS a GCC bug if you consider ANSI C99 standard.
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8139
 
 
 --
 Philippe Ribet
 
 
 
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