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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang crashes on dllexport inline methods with default arguments in PCH files in MS ABI mode"
href="https://llvm.org/bugs/show_bug.cgi?id=31121">31121</a>
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<th>Summary</th>
<td>Clang crashes on dllexport inline methods with default arguments in PCH files in MS ABI mode
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>LLVM Codegen
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider:
$ cat t.h
struct __declspec(dllexport) Foo {
enum E { E0 } e;
Foo(E e = E0) : e(e) {}
};
$ cat t.cpp
$ clang-cl -FIt.h -Yct.h t.cpp
Assertion failed: DefaultArg && "sema forgot to instantiate default args", file
..\tools\clang\lib\CodeGen\MicrosoftCXXABI.cpp, line 3877
...
Basically, dllexport interacts with PCH in interesting ways that we should
seriously revisit.
This was reduced out of blink / WebKit, which had this issue here:
<a href="https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/ViewportDescription.h?rcl=0&l=67">https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/dom/ViewportDescription.h?rcl=0&l=67</a></pre>
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</p>
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