tools/nolibc: annotate va_list printf formats

__attribute__(format(printf)) can also be used for functions that take a
va_list argument.

As per the GCC docs:

    For functions where the arguments are not available to be checked
    (such as vprintf), specify the third parameter as zero.

Link: https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index d7ef43973916c77853d9ae4f8ce75c9b3938ca58..16cd4d8072518b889ab97e7851a97dda740c7089 100644 (file)
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -212,7 +212,7 @@ char *fgets(char *s, int size, FILE *stream)
  *  - %s
  *  - unknown modifiers are ignored.
  */
-static __attribute__((unused))
+static __attribute__((unused, format(printf, 2, 0)))
 int vfprintf(FILE *stream, const char *fmt, va_list args)
 {
        char escape, lpref, c;
@@ -318,7 +318,7 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
        return written;
 }
 
-static __attribute__((unused))
+static __attribute__((unused, format(printf, 1, 0)))
 int vprintf(const char *fmt, va_list args)
 {
        return vfprintf(stdout, fmt, args);