https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96367
Zebediah Figura <zfigura at codeweavers dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |zfigura at codeweavers dot com
--- Comment #3 from Zebediah Figura <zfigura at codeweavers dot com> ---
I believe I'm running into this trying to compile Wine. Specifically, this
snprintf statement:
https://source.winehq.org/git/wine.git/blob/wine-7.17:/dlls/ntdll/unix/system.c#l3176
is yielding this warning:
../wine/dlls/ntdll/unix/system.c: In function ‘NtQuerySystemInformation’:
../wine/dlls/ntdll/unix/system.c:3176:36: error: ‘%s’ directive output between
0 and 2147483644 bytes may cause result to exceed ‘INT_MAX’
[-Werror=format-truncation=]
3176 | snprintf( info, size, "%s%c%s%c%s%c%s", version, 0, wine_build,
0, buf.sysname, 0, buf.release );
| ^~ ~~~~~~~~~~
../wine/dlls/ntdll/unix/system.c:3176:9: note: ‘snprintf’ output between 8 and
2147483780 bytes into a destination of size 4294967295
3176 | snprintf( info, size, "%s%c%s%c%s%c%s", version, 0, wine_build,
0, buf.sysname, 0, buf.release );
|
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
when compiled as 32-bit, using Wine's default flags (so notably -g -O2 -m32
-Wall).
I also tried to reduce it into a simpler test case:
#include <stdio.h>
#include <string.h>
extern const char text[];
size_t func(char *buffer, size_t size)
{
size_t len = strlen(text);
snprintf(buffer, size, "text%s", text);
return len;
}
which fails similarly with "gcc -m32 -O2 -Wall".
Is there a way we can even work around this in Wine? I don't see an obvious
one, especially with no clue why the bug is even happening.
