[LLVMbugs] [Bug 3075] New: Meaningless warning compiling standard code

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=3075

           Summary: Meaningless warning compiling standard code
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: NetBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Semantic Analyzer
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: neil at daikokuya.co.uk
                CC: llvmbugs at cs.uiuc.edu


#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);
}


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