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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Templated lambdas crashing the complier"
href="https://bugs.llvm.org/show_bug.cgi?id=52508">52508</a>
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<th>Summary</th>
<td>Templated lambdas crashing the complier
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
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<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>
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<th>Component</th>
<td>C++17
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ogito12311@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Here's some simplified code that exemplifies the problem.
int test(int x, int y)
{
auto test_lambda_impl2 = [&]<int f, int z>()
{
if constexpr((f + z) < 3)
{
cout << f+z << endl;
}
};
auto test_lambda_impl1 = [&]<int f>(int z)
{
switch(z)
{
case 0:
test_lambda_impl2.operator()<f, 0>();
break;
case 1:
test_lambda_impl2.operator()<f, 1>();
break;
case 2:
test_lambda_impl2.operator()<f, 2>();
break;
}
};
switch(x)
{
case 0:
test_lambda_impl1.operator()<0>(y);
break;
case 1:
test_lambda_impl1.operator()<1>(y);
break;
case 2:
test_lambda_impl1.operator()<2>(y);
break;
}
}
This just straight up crashes the compiler, if I remove test_lambda_impl2 and
just do something in test_lambda_impl1 instead, the code compiles but I get an
Invalid instruction exception or a segfault, depending on the code.
Clangd breaks when it has to parse this kind of code as well.
For reference, g++ works as expected.</pre>
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