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* Re: c/6765: gcc - incrementation - ternary operator
@ 2002-05-22 5:03 neil
0 siblings, 0 replies; 2+ messages in thread
From: neil @ 2002-05-22 5:03 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, jompo, nobody
Synopsis: gcc - incrementation - ternary operator
State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Wed May 22 05:03:03 2002
State-Changed-Why:
Not a bug. The standard states that whether the LHS or the RHS of '=' is evaluated first is undefined. You were lucky before.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6765
^ permalink raw reply [flat|nested] 2+ messages in thread
* c/6765: gcc - incrementation - ternary operator
@ 2002-05-22 4:26 jompo
0 siblings, 0 replies; 2+ messages in thread
From: jompo @ 2002-05-22 4:26 UTC (permalink / raw)
To: gcc-gnats
>Number: 6765
>Category: c
>Synopsis: gcc - incrementation - ternary operator
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Wed May 22 04:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Pothier Joel
>Release: gcc 2.95.2 - gcc 2.95.3 - gcc 3.04
>Organization:
>Environment:
gcc 2.95.3, gcc 3.04 (home compiled on Linux Mandrake 8.1)
Mac OS X : gcc 2.95.2
>Description:
the ternary operator causes incrementation of left hand side expression to occurs before it should in an expression where the variable appears at both side of the affectation expression.
example: *s++ = (*s == 'x') ? 'X': *s;
Note: this does not appears in gcc-2.96 (Mandrake 8.2)
>How-To-Repeat:
#include <stdio.h>
#define STRING "abc"
int main()
{
char s[10], *t;
strcpy(s, STRING);
t = s;
while (*t != '\0')
*t++ = (*t == 'b') ? 'X': *t;
/* this print "Xc" instead of "aXc" */
printf("%s\n",s);
}
>Fix:
Must replace ternary operator by if/else instruction
>Release-Note:
>Audit-Trail:
>Unformatted:
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2002-05-22 5:03 c/6765: gcc - incrementation - ternary operator neil
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2002-05-22 4:26 jompo
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