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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Designated initializer inside _Generic is misinterpreted"
href="https://bugs.llvm.org/show_bug.cgi?id=45540">45540</a>
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<th>Summary</th>
<td>Designated initializer inside _Generic is misinterpreted
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>9.0
</td>
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<th>Hardware</th>
<td>All
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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
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<th>Component</th>
<td>C11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>elronnd@elronnd.net
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
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<pre>POC:
typedef struct{int _;} A;
typedef struct{int _;} B;
typedef union {
A a;
B b;
} O;
#define NO(o) _Generic((o), \
A: ((O){.a=o}), \
B: ((O){.b=o}))
int main() {
A a;
O o = NO(a);
}
Generates the following error message:
t.c:15:18: error: initializing 'int' with an expression of incompatible type
'A'
O o = NO(a);
^
t.c:11:20: note: expanded from macro 'NO'
B: ((O){.b=o}))</pre>
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