GCC (Ubuntu 4.1.2-0ubuntu3) Causing Data Corruption

Binary package hint: gcc

Updated Feisty install as of 2007-02-26 (upgraded from Edgy). Noticed this strange behavior with GCC 4.1.2 today:

(test.txt is a text file containing a single digit, zero in this case).

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

int main()
{
 char c = 'a';
 const char d = '6';
 FILE *f = NULL;

 if((f = fopen("test.txt", "r")) == NULL) {
  fprintf(stderr, "Error opening file!\n");
  return EXIT_FAILURE;
 }

 printf("d = %c\n", d);
 printf("d = %d\n", atoi(&d));

 atoi(&c);

 c = fgetc(f);

 printf("d = %c\n", d);
 printf("d = %d\n", atoi(&d));

 fclose(f);

 return 0;
}
</code>
Should output:
d = 6
d = 6
d = 6
d = 6

Actual results:
d = 6
d = 6
d = 6
d = 60

It is interesting because test.txt contains only the digit zero, and 60 is output instead of 6. When change to 1...9 the 6 is always followed by the same digit as in the text file.

GCC 3.3 does not exhibit this behavior on the same system.