https://bugs.llvm.org/show_bug.cgi?id=45109
Bug ID: 45109
Summary: Variable template inside the class causes compiler
crash
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++17
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Created attachment 23204
--> https://bugs.llvm.org/attachment.cgi?id=23204&action=edit
Clang's stderr + -save-temps
An issue I'm going to describe I've encountered both in Clang 9 and Clang thunk
(https://godbolt.org/z/jffEf_) but not in GCC.
The following code causes compiler crash:
-------snippet(A) begin---------
template<auto>
struct X {};
template<typename T>
class Foo {
private:
template<auto v>
static constexpr auto copy = v; // (1)
public:
template<auto v>
Foo(X<v>)
{
auto val = copy<v>;
};
};
int main()
{
Foo<int> b{X<3>{}};
}
-------snippet(A) end---------
If the variable template (1) is moved out from the class (put above Foo), code
is compiled successfully.
The similar issue happens in a little bit different code (in this case,
compiler isn't crashed, but compilation results in error):
-------snippet(B) begin---------
template<auto>
struct X {};
template<typename T>
class Foo {
private:
template<auto v>
static constexpr auto copy = v; // (1)
public:
template<auto v>
Foo(X<v>)
: val{copy<v>}
{};
T val;
};
int main()
{
Foo<int> b{X<3>{}};
}
-------snippet(B) end---------
This is again can be worked around by defining a variable template (1) outside
the class.
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