https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96739
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
The warning is issued as a result of the if statement in help_oneline. Since
cmd is passed ct->name, if cmd is null then so is ct->name (see below).
Perhaps you went too far in reducing the test case?
$ cat pr96739.c && gcc -O2 -S -Wall pr96739.c
typedef struct cmdinfo {
const char *name;
} cmdinfo_t;
;
cmdinfo_t *cmdtab;
int ncmds;
static void help_oneline(const char *cmd, const cmdinfo_t *ct) {
if (cmd) {
} else {
__builtin_printf("%s ", ct->name);
}
}
void help_all(void) {
const cmdinfo_t *ct;
for (ct = cmdtab; ct < &cmdtab[ncmds]; ct++)
help_oneline (ct->name, ct);
}
In function ‘help_oneline’,
inlined from ‘help_all’ at pr96739.c:17:5:
pr96739.c:11:5: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
11 | __builtin_printf("%s ", ct->name);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
