[LLVMbugs] [Bug 6697] New: format attribute not respected in printf warning

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Mar 24 15:31:17 PDT 2010


           Summary: format attribute not respected in printf warning
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Driver
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: ori at avtalion.name
                CC: llvmbugs at cs.uiuc.edu

Compiling the following code:

#include <stdio.h>
#include <stdarg.h>

void myprintf(const char *format, int x, ...) __attribute__((__format__(printf,
1, 3)));
void myprintf(const char *format, int x, ...) {
    va_list args;
    va_start(args, x);
    vprintf(format, args);

int main() {
    myprintf("%s\n", 1, "foo");
    return 0;

Yields the warning:

format.c:13:13: warning: conversion specifies type 'char *' but the argument
has type 'int' [-Wformat]
        myprintf("%s\n", 1, "foo");
                  ~^     ~

However, the __format__ attribute clearly states that the varargs begin at 3,
not 2.

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