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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - New diagnostic -Wzero-as-null-pointer-constant warns on code in system headers."
href="https://bugs.llvm.org/show_bug.cgi?id=36520">36520</a>
</td>
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<th>Summary</th>
<td>New diagnostic -Wzero-as-null-pointer-constant warns on code in system headers.
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lukasza@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This is a follow-up for <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - New diagnostic -Wzero-as-null-pointer-constant warns on macros expanded from system headers."
href="show_bug.cgi?id=33771">https://bugs.llvm.org/show_bug.cgi?id=33771</a> - even
after this bug got fixed, some system headers result in warnings/errors:
In file included from ../../base/message_loop/message_pump_glib.cc:10:
In file included from
../../build/linux/debian_stretch_amd64-sysroot/usr/include/glib-2.0/glib.h:50:
In file included from
../../build/linux/debian_stretch_amd64-sysroot/usr/include/glib-2.0/glib/ghash.h:33:
In file included from
../../build/linux/debian_stretch_amd64-sysroot/usr/include/glib-2.0/glib/glist.h:32:
../../build/linux/debian_stretch_amd64-sysroot/usr/include/glib-2.0/glib/gmem.h:192:10:
error: zero as null pointer constant [-Werror,-Wzero-as-null-pointer-constant]
*ptr = NULL;
^~~~
nullptr
../../third_party/llvm-build/Release+Asserts/lib/clang/7.0.0/include/stddef.h:100:18:
note: expanded from macro 'NULL'
# define NULL __null
base/message_loop/message_pump_glib.cc looks like this (in particular, note
that |#include <foo.h>| rather than |#include "foo.h"| was used):
...
#include "base/message_loop/message_pump_glib.h"
#include <fcntl.h>
#include <math.h>
#include <glib.h> // <--- THIS PULLS IN SYSTEM HEADERS THAT RESULT IN THE
WARNING
#include "base/lazy_instance.h"
#include "base/logging.h"
...</pre>
</div>
</p>
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