On 25.07.2019 02:53, [email protected] wrote:
> From: Christopher Clark <[email protected]>
>
> gcc 9.1.0 reports:
>
> | test-cpu-policy.c:64:18: error: '%.12s' directive argument is not a
> nul-terminated string [-Werror=format-overflow=]
> | 64 | fail(" Test '%.12s', expected vendor %u, got %u\n",
> | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | test-cpu-policy.c:20:12: note: in definition of macro 'fail'
> | 20 | printf(fmt, ##__VA_ARGS__); \
> | | ^~~
> | test-cpu-policy.c:64:27: note: format string is defined here
> | 64 | fail(" Test '%.12s', expected vendor %u, got %u\n",
> | | ^~~~~
> | test-cpu-policy.c:44:7: note: referenced argument declared here
> | 44 | } tests[] = {
> | | ^~~~~
In order to possibly create a bug report against gcc I've tried this:
#include <stdio.h>
struct s {
char ac[12];
int i;
};
void test(const struct s*ps) {
printf("'%.12s'\n", ps->ac);
}
There's no warning here. Could you check whether the compiler warns on
that simple test for you? If it does - are we talking about plain
upstream 9.1.0 (in which case I'd be really puzzled by the difference
in behavior)?
Jan
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