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* [Bug c/107754] New: Confusing -Warray-bounds warning with strcpy
@ 2022-11-18 21:19 nightstrike at gmail dot com
2022-11-18 21:28 ` [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer pinskia at gcc dot gnu.org
2022-11-18 21:29 ` [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer and non-zero offset for struct array pinskia at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: nightstrike at gmail dot com @ 2022-11-18 21:19 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107754
Bug ID: 107754
Summary: Confusing -Warray-bounds warning with strcpy
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: nightstrike at gmail dot com
Target Milestone: ---
Metabug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=warray-bounds
// Compile with GCC 12.2.0 with -O2:
// warning: ‘strcpy’ offset 0 is out of the bounds [0, 0] [-Warray-bounds]
// no warning without -O2
struct Inst;
struct Class { int offset; };
static struct Class * classFoo; // No problem without static here
struct Foo
{
unsigned int a; // no problem if commented out
char bar[1024];
};
void setFoo(struct Inst * this, const char * value)
{
struct Foo * ptr = (struct Foo *)(this ? (((char *)this) + classFoo->offset)
: 0);
__builtin_strcpy(ptr->bar, value);
}
$ gcc-12 -c -O2 -Warray-bounds a.c -o /dev/null
a.c: In function 'setFoo':
a.c:19:4: warning: '__builtin_strcpy' offset 0 is out of the bounds [0, 0]
[-Warray-bounds]
19 | __builtin_strcpy(ptr->bar, value);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-11-18 21:29 UTC | newest]
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2022-11-18 21:19 [Bug c/107754] New: Confusing -Warray-bounds warning with strcpy nightstrike at gmail dot com
2022-11-18 21:28 ` [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer pinskia at gcc dot gnu.org
2022-11-18 21:29 ` [Bug tree-optimization/107754] Confusing -Warray-bounds warning with strcpy with a null pointer and non-zero offset for struct array pinskia at gcc dot gnu.org
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