http://llvm.org/bugs/show_bug.cgi?id=18982
Bug ID: 18982
Summary: Feature request: Suppressing -Wformat-nonliteral
warning with va_list format argument
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
For the following code, clang emits a -Wformat-nonliteral warning.
------------------------------------
$: cat s.c
#include <stdarg.h>
#include <stdio.h>
void foo (const char *msg, ...) {
va_list ap;
va_start (ap, msg);
vfprintf (stderr, msg, ap);
va_end (ap);
}
------------------------------------
$: clang-trunk -Wformat-nonliteral s.c -c
s.c:6:21: warning: format string is not a string literal [-Wformat-nonliteral]
vfprintf (stderr, msg, ap);
^~~
1 warning generated.
$: gcc-trunk -Wformat=2 -c s.c
$
IMHO, since it is a wrapper function to printf, it is better to suppress this
warning. I also checked the gcc manual, and gcc specially handles such case.
-Wformat-nonliteral
If -Wformat is specified, also warn if the format string is not a string
literal and so cannot be checked, unless the format function takes its format
arguments as a va_list.
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