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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang 4.0 template template partial specialization bug"
href="https://bugs.llvm.org/show_bug.cgi?id=33294">33294</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang 4.0 template template partial specialization bug
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>4.0
</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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paul@preney.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=18569" name="attach_18569" title="Program demonstrating clang++ v4.0 issue">attachment 18569</a> <a href="attachment.cgi?id=18569&action=edit" title="Program demonstrating clang++ v4.0 issue">[details]</a></span>
Program demonstrating clang++ v4.0 issue
Attached is code that shows a bug with the clang++ v4.0 compiler. Such compiles
fine with all versions of GCC and code like this has worked with clang++ v3.9
and earlier.
Specifically, compiling with GCC (e.g., v5, 6, and 7) compiles without issues:
g++-7.1.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
and runs:
$ ./a.out
10
10
$
Unfortunately, clang++-4.0 outputs these errors:
$ clang++-4.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
tt.cxx:24:27: error: template template argument has different template
parameters than its corresponding template template parameter
struct is_valuett<valuett<TT>> final : std::true_type { };
^
tt.cxx:23:34: note: template non-type parameter has a different type 'T' in
template argument
template <template <typename T, T> class TT>
^
tt.cxx:17:34: note: previous non-type template parameter with type 'T' is here
template <template <typename T, T> class TT>
^
tt.cxx:24:1: error: cannot combine with previous '(error)' declaration
specifier
struct is_valuett<valuett<TT>> final : std::true_type { };
^
2 errors generated.
zsh: exit 1 clang++-4.0 -std=c++14 -Wall -Wextra -pedantic tt.cxx
$</pre>
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