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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No -Wc++-compat warning on uninitialized const field in struct"
href="http://llvm.org/bugs/show_bug.cgi?id=18923">18923</a>
</td>
</tr>
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<th>Summary</th>
<td>No -Wc++-compat warning on uninitialized const field in struct
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>At trunk 201801. I am not sure whether clang support the warning flag
-Wc++-compat. Currently it does not warn on the uninitialized field in a
struct.
$: cat s.c
struct S{const int i;};
void f() {struct S s;}
$: clang-trunk -Wc++-compat -c s.c
$: clang++ -c s.c
clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is
deprecated
s.c:1:8: error: implicit default constructor for 'S' must explicitly initialize
the const member 'i'
struct S{const int i;};
^
s.c:1:20: note: declared here
struct S{const int i;};
^
s.c:2:20: note: implicit default constructor for 'S' first required here
void f() {struct S s;}
^
1 error generated.
$:
$: gcc-trunk -Wc++-compat -c s.c
s.c: In function ‘f’:
s.c:2:20: warning: uninitialized const member in ‘struct S’ is invalid in C++
[-Wc++-compat]
void f() {struct S s;}
^
s.c:1:20: note: ‘i’ should be initialized
struct S{const int i;};
^</pre>
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