https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115570
Bug ID: 115570
Summary: array subscript 'long unsigned int[0]' is partly
outside array bounds of 'unsigned char[4]'
Product: gcc
Version: 13.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: Curt.Blank at curtronics dot com
Target Milestone: ---
I just ran into a compile error on code that has been just fine for 18 years.
The only reason I'm compiling it is just to be sure on a new computer/Linux
install.
With gcc 4.8.3 I do not get the warnings, with gcc 13.3.0 I get the warnings
shown below the code below. The char string being converted is hex, data
returned from a solar inverter.
And like I said it's been fine and I suspect the program will run fine just
cannot fully test it yet until data collect is moved to this new server.
*--------------------------------------------------------------------------
szCvrtLong
Converts a 4 char string to a long.
----------------------------------------------------------------------------*/
unsigned long szCvrtLong(char *Buffer)
{
unsigned char cValue[4];
unsigned long *value = 0;
if (! bSwapEndian) {
cValue[0] = Buffer[aParam4] & 0xff;
cValue[1] = Buffer[aParam3] & 0xff;
cValue[2] = Buffer[aParam2] & 0xff;
cValue[3] = Buffer[aParam1] & 0xff;
} else {
cValue[0] = Buffer[aParam1] & 0xff;
cValue[1] = Buffer[aParam2] & 0xff;
cValue[2] = Buffer[aParam3] & 0xff;
cValue[3] = Buffer[aParam4] & 0xff;
}
value = (unsigned long *)cValue;
if (bVerbose) fprintf(stderr, "szCvrtLong %12lu
0x%02x%02x%02x%02x\n",*value &
0xffffffff,cValue[3],cValue[2],cValue[1],cValue[0]);
return(*value & 0xffffffff);
}
-----------
comm.c: In function 'szCvrtLong.constprop':
comm.c:1906:77: warning: array subscript 'long unsigned int[0]' is partly
outside array bounds of 'unsigned char[4]' [-Warray-bounds=]
1906 | if (bVerbose) fprintf(stderr, "szCvrtLong %12lu
0x%02x%02x%02x%02x\n",*value &
0xffffffff,cValue[3],cValue[2],cValue[1],cValue[0]);
|
^~~~~~
comm.c:1890:19: note: object 'cValue' of size 4
1890 | unsigned char cValue[4];
| ^~~~~~
comm.c:1908:12: warning: array subscript 'long unsigned int[0]' is partly
outside array bounds of 'unsigned char[4]' [-Warray-bounds=]
1908 | return(*value & 0xffffffff);
| ^~~~~~
comm.c:1890:19: note: object 'cValue' of size 4
1890 | unsigned char cValue[4];
| ^~~~~~
