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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Microsoft mangling cannot mangle injected class name type"
href="https://bugs.llvm.org/show_bug.cgi?id=36181">36181</a>
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<th>Summary</th>
<td>Microsoft mangling cannot mangle injected class name type
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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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>smeenai@fb.com
</td>
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<th>CC</th>
<td>compnerd@compnerd.org, david.majnemer@gmail.com, dgregor@apple.com, llvm-bugs@lists.llvm.org, rnk@google.com
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<div>
<pre>Using the reduced test case from <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - We shouldn't try to mangle an injected class name with -fdelayed-template-parsing and -cxx-abi microsoft"
href="show_bug.cgi?id=16887">https://bugs.llvm.org/show_bug.cgi?id=16887</a> (I
independently arrived at an almost equivalent reduced test case before finding
that one, sigh):
% cat reduced.h
template <typename T> struct A {
friend void f(A<T>) {}
};
void g() { f(A<int>()); }
% touch empty.cpp
% clang -cc1 -triple x86_64-windows-msvc -emit-pch -o reduced.h.pch -x
c++-header reduced.h
% clang -cc1 -triple x86_64-windows-msvc -emit-llvm -include-pch reduced.h.pch
empty.cpp
Cannot mangle injected class name type.
UNREACHABLE executed
<a href="https://reviews.llvm.org/rL188536">https://reviews.llvm.org/rL188536</a> changed this from an error to an unreachable.
It should indeed be unreachable for -fdelayed-template-parsing (and running
both of the above clang invocations with -fdelayed-template-parsing doesn't
crash), but it is reachable otherwise.
This is the same underlying issue as
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Cannot mangle injected class name type."
href="show_bug.cgi?id=35473">https://bugs.llvm.org/show_bug.cgi?id=35473</a> and
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang test Modules/odr_hash-Friend.cpp causes assertion failure "Cannot mangle injected class name type." at lib\AST\MicrosoftMangle.cpp:2478"
href="show_bug.cgi?id=35939">https://bugs.llvm.org/show_bug.cgi?id=35939</a>. I'm reporting this separately
because this is triggered with a precompiled header vs. modules, and there's a
reduced standalone test case.</pre>
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