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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - some problematic casts applied to NULL are not diagnosed"
href="https://bugs.llvm.org/show_bug.cgi?id=40725">40725</a>
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<th>Summary</th>
<td>some problematic casts applied to NULL are not diagnosed
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>Testcase:
#define NULL __null
int *p = reinterpret_cast<int*>(NULL); // #1
enum E {}; E e = static_cast<E>(NULL); // #2
float f = static_cast<float>(NULL); // #3
This produces no diagnostics. All marked lines should result in a warning:
-- #1 does not necessarily produce a null pointer; it produces a pointer whose
value is all-zero-bits. We should suggest replacing reinterpret_cast with
static_cast here.
-- #2 and #3 don't make any sense; they're using NULL as an integer rather
than as a pointer. We should suggest replacing NULL with 0 here.
Generally, we should probably warn on any use of NULL where nullptr would not
be valid or would mean something else.</pre>
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