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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiler hang when declaring an array of structures"
href="https://bugs.llvm.org/show_bug.cgi?id=50639">50639</a>
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<th>Summary</th>
<td>Compiler hang when declaring an array of structures
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
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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
</td>
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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>k.even-mendoza@imperial.ac.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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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24933" name="attach_24933" title="code that caused a compiler hang with -O0 and -O2">attachment 24933</a> <a href="attachment.cgi?id=24933&action=edit" title="code that caused a compiler hang with -O0 and -O2">[details]</a></span>
code that caused a compiler hang with -O0 and -O2
Hi,
I got a compiler hang when running:
```
clang -O2 -pedantic -w -Wextra test874084080-f2f58a.c
```
I attached the code after pre-processing (so all headers are in, but I can
supply the original code and the headers separately if needed).
I ran it for 12 hours with a pretty strong machine: Ubuntu-18,32GB, 64x, 4CPU.
It happens with clang-10, 11, 12 and 13.
GCC returns the errors in few seconds; this program is not supposed to pass
compilation, I hit this issue while using creduce for some testcases I got.
It seems to be related to this variable:
```
static struct S0 g_434[];
```
When replacing it to be
```
static struct S0 g_434;
```
and patching the use of it in the code, the problem disappeared.</pre>
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