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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "fragment covers entire variable" verifier error in Windows thinlto builds"
href="https://bugs.llvm.org/show_bug.cgi?id=47338">47338</a>
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<th>Summary</th>
<td>"fragment covers entire variable" verifier error in Windows thinlto builds
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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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>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>akhuang@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>We ran into this error in chromium thinlto builds on windows, with
-debug-info-kind=constructor enabled. With -debug-info-kind=constructor, more
class types are not defined in the debug info and don't have sizes.
Here's a reduced repro that shows the fragment being emitted (for C.a_, I
think). The verifier error only happens with thinlto, because the assert isn't
called if the var size doesn't exist (during thinlto the complete type is
probably pulled from somewhere else).
$ cat t.cpp
// With ctor homing, this struct is not defined in the debug info, so it
doesn't have a size.
struct A {
A();
int i;
};
struct B {
virtual void f();
};
struct C {
C(A a, B a) : a_(a), b_(b) {}
A a_;
B b_;
};
C CodeFactory() {
A a;
return C(a, B{});
}
$ clang -cc1 -triple i386-windows-msvc -O2 -debug-info-kind=constructor -o t.ll
t.cpp
I fixed a similar issue in `transferSRADebugInfo` by not getting the size from
the DI type (<a href="https://reviews.llvm.org/D85572">https://reviews.llvm.org/D85572</a>), but not sure if I can do the
same thing here.</pre>
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