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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Diagnostic missing for redefinition"
href="https://bugs.llvm.org/show_bug.cgi?id=42247">42247</a>
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<th>Summary</th>
<td>Diagnostic missing for redefinition
</td>
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<th>Product</th>
<td>clang
</td>
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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>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
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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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<pre>My clang is 9.0.0, and the code is:
class foo {
public:
typedef int bar;
};
class baz {
public:
foo::bar foo;
};
clang accepts with any warning messages. Although a diagnostic is not strictly
required by the standard (§3.3.6, basic.scope.class), but would be very useful.
The code comes from a gcc bug report:
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28513">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=28513</a>
gcc 10.0.0 rejects the code:
error: declaration of ‘foo baz::foo’ changes meaning of ‘foo’ [-fpermissive]
9 | foo foo;
| ^~~
/home/haozhong/project/approach/compilerpara/gcc/tmp/gcc_28513/code1.c.cpp:1:7:
note: ‘foo’ declared here as ‘class foo’
1 | class foo {
| ^~~
Shall clang present similar warning messages?</pre>
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