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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash in code generation or optimizer"
href="https://bugs.llvm.org/show_bug.cgi?id=45341">45341</a>
</td>
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<th>Summary</th>
<td>Crash in code generation or optimizer
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>7.0
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23284" name="attach_23284" title="Reproduction.zip">attachment 23284</a> <a href="attachment.cgi?id=23284&action=edit" title="Reproduction.zip">[details]</a></span>
Reproduction.zip
When compiling with -fsyntax-only, I don't get the problem.
When compiling with LLVM 9.0.0, I also don't get a crash.
However, I'm unable to upgrade this project as the compilers have been fixed on
release. Some understanding of why this is happening would be useful to work
around these crashes. (Note that some manipulations can fix the crash on this
production without doing this on the original)
// C:\LLVM_7_0_0\bin\clang-cl.exe /c /EHsc -w /std:c++17 t.cpp
// See reproduction.zip for preprocessed code + .sh
#include <string>
#include <variant>
#include <vector>
struct A {
std::basic_string<wchar_t> m;
};
struct B {
B(A a);
std::variant<A> m;
};
struct C : B {
using B::B;
};
void f() {
std::vector<C> c{};
auto a = A{};
auto b = C{std::move(a)};
c.push_back(C{A{}});
}</pre>
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