https://bugs.llvm.org/show_bug.cgi?id=52508
Bug ID: 52508
Summary: Templated lambdas crashing the complier
Product: clang
Version: 12.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++17
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
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.
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