<html>
<head>
<base href="https://llvm.org/bugs/" />
</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 --- - clang-cl and msvc-cl disagree about static initialization"
href="https://llvm.org/bugs/show_bug.cgi?id=26210">26210</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang-cl and msvc-cl disagree about static initialization
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When compiling a function like this:
inline const T *Ops() {
static int k;
static const T sOps = true ? 0 : &k;
return &sOps;
}
msvc puts sOps in a read-write section, while clang puts sOps in a read-only
section. If the code for Ops() is not included in the object file from clang,
the linker can pick the read-only sOps from clang and Ops() implementation from
msvc. When the msvc Ops() runs it will crash trying to write to sOps.
I've put up a repo that reproduces this issue here:
<a href="https://github.com/jrmuizel/read-only-symbol-crash/">https://github.com/jrmuizel/read-only-symbol-crash/</a>
We're currently trying to bisect some clang related compilation issues and this
is preventing us from linking object files from clang and cl together. I
suspect using the clang front end on top of cl2 backend will also suffer from
this interoperability issue.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>