'[llvm-bugs] [Bug 50946] New: format-pedantic warns about passing nullptr to %p'

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List:       llvm-bugs
Subject:    [llvm-bugs] [Bug 50946] New: format-pedantic warns about passing nullptr to %p
From:       via llvm-bugs <llvm-bugs () lists ! llvm ! org>
Date:       2021-06-30 17:00:00
Message-ID: bug-50946-206 () http ! bugs ! llvm ! org/
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Date: Wed, 30 Jun 2021 10:00:00 -0700
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https://bugs.llvm.org/show_bug.cgi?id=50946

            Bug ID: 50946
           Summary: format-pedantic warns about passing nullptr to %p
           Product: clang
           Version: 12.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs@nondot.org
          Reporter: eyalroz1@gmx.com
                CC: blitzrakete@gmail.com, dgregor@apple.com,
                    erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org,
                    richard-llvm@metafoo.co.uk

Godbolt: https://godbolt.org/z/1dMKE1W81

If we compile:

  #include <stdio.h>

  int main()
  {
      printf("%p\n", nullptr);
  }

with clang++ -Wformat -pedantic, we get:

<source>:5:20: warning: format specifies type 'void *' but the argument has
type 'nullptr_t' [-Wformat-pedantic]
    printf("%p\n", nullptr);
            ~~     ^~~~~~~

I believe that's _too_ pedantic. It is well and proper to pass nullptr to a %p
without casting it.

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Date: Wed, 30 Jun 2021 10:00:00 -0700
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<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </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 - format-pedantic warns about passing nullptr to %p"
   href="https://bugs.llvm.org/show_bug.cgi?id=50946">50946</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>format-pedantic warns about passing nullptr to %p
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>12.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </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&#64;nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>eyalroz1&#64;gmx.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete&#64;gmail.com, dgregor&#64;apple.com, \
erik.pilkington&#64;gmail.com, llvm-bugs&#64;lists.llvm.org, \
richard-llvm&#64;metafoo.co.uk  </td>
        </tr></table>
      <p>
        <div>
        <pre>Godbolt: <a \
href="https://godbolt.org/z/1dMKE1W81">https://godbolt.org/z/1dMKE1W81</a>

If we compile:

  #include &lt;stdio.h&gt;

  int main()
  {
      printf(&quot;%p\n&quot;, nullptr);
  }

with clang++ -Wformat -pedantic, we get:

&lt;source&gt;:5:20: warning: format specifies type 'void *' but the argument has
type 'nullptr_t' [-Wformat-pedantic]
    printf(&quot;%p\n&quot;, nullptr);
            ~~     ^~~~~~~

I believe that's _too_ pedantic. It is well and proper to pass nullptr to a %p
without casting it.</pre>
        </div>
      </p>

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