Meaningless warning compiling standard code

[llvmbot]

Bugzilla Link	3075
Resolution	FIXED
Resolved on	Mar 12, 2010 00:57
Version	unspecified
OS	NetBSD
Reporter	LLVM Bugzilla Contributor

Extended Description

#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);
}

gives:

$ clang /tmp/stdarg.c
/tmp/stdarg.c:8:3: warning: passing 'char const *' discards qualifiers, expected '__builtin_va_list'
va_start (ap, msg);
^~~~~~~~
1 diagnostic generated.

If it helps, the bit after the headers is preprocessed by clang to

void foo (const char *msg, ...)
{
va_list ap;

__builtin_stdarg_start((ap), (msg));
vfprintf ((&__sF[2]), msg, ap);
__builtin_va_end (ap);
}

[lattner]

Thanks Neil!
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20081110/009292.html