<html>
    <head>
      <base href="https://llvm.org/bugs/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - -Wnull-conversion warnings are no longer reported for `char c = NULL`"
   href="https://llvm.org/bugs/show_bug.cgi?id=31842">31842</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wnull-conversion warnings are no longer reported for `char c = NULL`
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>cpeterson@mozilla.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The following program used to report a -Wnull-conversion warning with whatever
clang version Apple was shipping in 2012:

  warning: implicit conversion of NULL constant to 'char' [-Wnull-conversion]

I noted this in a Firefox bug:
<a href="https://bugzilla.mozilla.org/show_bug.cgi?id=778984">https://bugzilla.mozilla.org/show_bug.cgi?id=778984</a>

With the latest clang version Apple is shipping (Apple LLVM version 8.0.0
(clang-800.0.42.1, Target: x86_64-apple-darwin16.4.0), the following program
produces no warnings, even with clang -Weverything:


#include <stdlib.h>

int main()
{
  bool b = NULL; (void) b;
  char c = NULL; (void) c;
  int i = NULL; (void) i;
  return 0;
}</pre>
        </div>
      </p>
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