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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang accepts an alignment value that is not a positive integral power of 2"
href="https://bugs.llvm.org/show_bug.cgi?id=47877">47877</a>
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<th>Summary</th>
<td>clang accepts an alignment value that is not a positive integral power of 2
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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
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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>tangyixuan@mail.dlut.edu.cn
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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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<pre>Hi, the following code allocates memory for an integer variable 'a' with '5',
which is not an integral power of two. However, Clang accepts it.
Please take a look at paragraph [4]:
<a href="http://eel.is/c++draft/basic.align">http://eel.is/c++draft/basic.align</a>
$ cat s.cpp
void * a = new int __attribute__ ((aligned (5)))();
$ g++ -c s.cpp
s.cpp:1:48: error: requested alignment ‘5’ is not a positive power of 2
1 | void * a = new int __attribute__ ((aligned (5)))();</pre>
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