https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84050
Bug ID: 84050
Summary: missing -Warray-bounds accessing a struct array member
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC diagnoses tnhe out-of-bounds array index in function farray() below but
fails to diagnose the same bug in fstatic_array.
$ cat t.c && gcc -O2 -S -Wall t.c
struct A { int a[3]; };
int fstatic_array (void)
{
static struct A a = { { 1, 2, 3 } };
return a.a[7]; // missing -Warray-bounds
}
int farray (void)
{
extern struct A f (void);
struct A a = f ();
return a.a[7]; // -Warray-bounds (good)
}
t.c: In function ‘farray’:
t.c:16:13: warning: array subscript 7 is above array bounds of ‘int[3]’
[-Warray-bounds]
return a.a[7]; // -Warray-bounds (good)
~~~^~~
