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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Cannot initialize variable with rvalue of same type?" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24259&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=Jp2f9QqE4u4QKdIAjbUv07o3hbSXCcBWUpi4NNo-mAQ&s=CIsfh-IQ77P60GLq-l-_fvlIlmAQ6SLc_mLmVFQCHU0&e=">24259</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Cannot initialize variable with rvalue of same type?
</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>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
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<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>paul_robinson@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat t.cpp
void foo() {
int s = 4;
int b[1][s];
int (*p)[s] = b + 1;
}
$ clang -x c -c t.cpp
$ clang -x c++ -c t.cpp
t.cpp:4:9: error: cannot initialize a variable of type 'int (*)[s]' with an
rvalue of type 'int (*)[s]'
int (*p)[s] = b + 1;
^ ~~~~~
1 error generated.
VLAs are not part of C++ but Clang claims to support them if everything
is nicely POD-like.
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__clang.llvm.org_compatibility.html-23vla&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=Jp2f9QqE4u4QKdIAjbUv07o3hbSXCcBWUpi4NNo-mAQ&s=bu5svH1HVguMd4UBo50oFqt2BbOHrB7lBPSv9Lz6x_A&e=">http://clang.llvm.org/compatibility.html#vla</a>
If I take out the "+ 1" C mode is still fine but C++ mode gets:
t.cpp:4:9: error: cannot initialize a variable of type 'int (*)[s]' with an
lvalue of type 'int [1][s]'
int (*p)[s] = b;
^ ~
1 error generated.</pre>
</div>
</p>
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