c/1540: Strange effects whe defining 2-dimensional arrays

[lampe@tu-harburg.de]

>Number:         1540
>Category:       c
>Synopsis:       Strange effects whe defining 2-dimensional arrays
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jan 03 05:56:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Mattias Lampe
>Release:        gcc version 2.95.2 19991024 (release)
>Organization:
>Environment:
Intel Celeron 500 MHz, SuSE Linux 6.4 (Kernel 2.2.14)
>Description:
When defining a 2-dimensional array, having an y-dimension
of 1 and the last element 0 (see code example), the first 
element of a previously defined array is modified (set to 0).

The same code works correctly with Visual C++ under 
Windows NT.

The problem does not exist
 - if the y-dimension is larger than 1 or
 - if the last element of the array is not 0.
>How-To-Repeat:
Sourcefile (test.c):

----------------------------------------
#include <stdio.h>
#include <stdlib.h>

int main()
{
int i,j;

int array1[4][4]={{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
int array2[2][1]={{1},{0}};

for(i=0;i<4;i++)
for(j=0;j<4;j++)
printf("%i ",array1[i][j]);

return 0;
}
---------------------------------------

Compile with

  gcc -Wall test.c -o test

and run.

Output:

0 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 

(should be 1 2 3 4 ...!)
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: