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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [clang-cl] [ms] Implement warning for shadowing of template parameter extension"
href="https://bugs.llvm.org/show_bug.cgi?id=40577">40577</a>
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<th>Summary</th>
<td>[clang-cl] [ms] Implement warning for shadowing of template parameter extension
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<th>Product</th>
<td>clang
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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>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>heavenandhell171@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Clang usually warns whenever it compiles non conformant code that MSVC accepts,
which i think it's great. However, there is no warning for shadowing of
template parameters, which is illegal.
For exemple:
$ cat test.cpp
template <typename T>
struct type_t {
template <typename T>
void function() {
}
};
$ clang-cl -c test.cpp
No warning.
I discovered that this is ill-formed when i pushed some code and the GCC build
bot failed. It would be nice to have Clang warn about this extension.
Something like:
$ clang-cl -c test.cpp
test.cpp(3,22): warning: declaration of 'T' shadows template parameter;
ignored as a Microsoft extension
[-Wmicrosoft-template]
template <typename T>
^
test.cpp(1,20): note: template parameter is declared here
template <typename T>
^
1 warning generated.</pre>
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