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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113752

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
[hjl@gnu-skx-1 gcc]$ cat /tmp/foo.i
char a[10256];
char b;
char *c, *g;
int d, e, f;
int sprintf(char *, char *, ...);
unsigned long strlen(char *);
int h(char *j) {
  if (strlen(j) + strlen(c) + strlen(g) + 32 > 10256)
    return 0;
  sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
  return 1;
}
void i() { h("wctype"); }
[hjl@gnu-skx-1 gcc]$ ./xgcc -B./ -O3 -Wall -S /tmp/foo.i
/tmp/foo.i: In function ?i?:
/tmp/foo.i:10:33: warning: ?%s? directive writing up to 10218 bytes into a
region of size between 0 and 10240 [-Wformat-overflow=3D]
   10 |   sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |                                 ^~
In function ?h?,
    inlined from ?i? at /tmp/foo.i:13:12:
/tmp/foo.i:10:3: note: ?sprintf? output between 18 and 20484 bytes into a
destination of size 10256
   10 |   sprintf(a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[hjl@gnu-skx-1 gcc]$=