[Bug tree-optimization/104657] New: array subscript 0 is outside array bounds
christophm30 at gmail dot com
gcc-bugzilla@gcc.gnu.org
Wed Feb 23 10:18:04 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104657
Bug ID: 104657
Summary: array subscript 0 is outside array bounds
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: christophm30 at gmail dot com
Target Milestone: ---
Compiling the following code:
void foo(unsigned long v)
{
volatile unsigned long *p;
p = (void *)0x8;
*p = v;
}
with GCC master and "-O2 -Wall" results in the following warning:
$ gcc -O2 -Wall -c array_subscript_0.c
array_subscript_0.c: In function 'foo':
array_subscript_0.c:5:9: warning: array subscript 0 is outside array bounds of
'volatile long unsigned int[0]' [-Warray-bounds]
5 | *p = v;
| ^~
This warning is unexpected and is not triggered by earlier versions of GCC.
Possibly related: pr101977
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