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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Out-of-sequence initialiser causes clang to crash"
href="https://llvm.org/bugs/show_bug.cgi?id=23514">23514</a>
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<th>Summary</th>
<td>Out-of-sequence initialiser causes clang to crash
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.6
</td>
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<th>Hardware</th>
<td>All
</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>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>andyg1001@hotmail.co.uk
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>A simplified test case:
struct S {
S(int a) : a(a) { }
int a;
};
struct P {
char i1 : 1;
char i2 : 7;
S s; // avoid crash by changing "S" to "int"
};
static P MakeP() {
return P { .i1 = 1, .s = 2, .i2 = 3 }; // or using correct order
}
The code as it stands above crashes clang with...
SemaInit.cpp:6455: void diagnoseListInit(clang::Sema&, const
clang::InitializedEntity&, clang::InitListExpr*): Assertion
`DiagnoseInitList.HadError() && "Inconsistent init list check result."' failed.
This is the outcome on clang 3.6.0 and 3.4.1 (which are the two versions I have
tested).
There are two work-arounds that avoid the crash:
1. Change P::s to "int" rather than "struct S"
2. Use a sequential initialisation order in MakeP()
It seems that clang cannot handle this particular scenario where others are ok.
The following arrangement for "struct P" is, however, ok (oddly?):
struct P {
S s;
char i2 : 7;
char i1 : 1;
};</pre>
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