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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 - Segfault when parsing use of static data member template with deduced type dependent on class template template parameter"
href="https://bugs.llvm.org/show_bug.cgi?id=42372">42372</a>
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<th>Summary</th>
<td>Segfault when parsing use of static data member template with deduced type dependent on class template template parameter
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>eracpp@eml.cc
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The following example (<a href="https://gcc.godbolt.org/z/lrNU6I">https://gcc.godbolt.org/z/lrNU6I</a>):
template <typename> int C = 0;
template <template <typename> typename T>
struct S
{
template <typename U>
static auto const X = C<T<U>>;
int x = X<void>;
};
Produces a stack dump (omitted program arguments flags due to verbosity; see
the Compiler Explorer link above for full message):
Stack dump:
0. Program arguments: ...
1. <eof> parser at end of file
2. <source>:4:1: parsing struct/union/class body 'S'
#0 0x000055eb13de3c4a llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/opt/compiler-explorer/clang-trunk-20190624/bin/clang-9+0x2754c4a)
#1 0x000055eb13de1a14 llvm::sys::RunSignalHandlers()
(/opt/compiler-explorer/clang-trunk-20190624/bin/clang-9+0x2752a14)
#2 0x000055eb13de1b52 SignalHandler(int)
(/opt/compiler-explorer/clang-trunk-20190624/bin/clang-9+0x2752b52)
#3 0x00007ff38b971890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
clang-9: error: unable to execute command: Segmentation fault (core dumped)
clang-9: error: clang frontend command failed due to signal (use -v to see
invocation)
Compiler returned: 254
The type of the static data member must be deduced (e.g. replacing `auto` with
`int` avoids the segfault; `decltype(auto)` also works in place of `auto`). The
static data member must be used (`X<void>`) to induce the segfault (e.g.
removing `int x = X<void>;` avoids the segfault).</pre>
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</p>
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