https://bugs.llvm.org/show_bug.cgi?id=40195
Bug ID: 40195
Summary: Compile error related to constexpr variable template
in a template class
Product: clang
Version: 7.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++'17
Assignee: unassignedclangb...@nondot.org
Reporter: ambr...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
The following C++17 program does not compile:
template<typename>
struct A {
template<typename>
inline static constexpr int X = 1;
inline static constexpr int Y = X<void>;
};
constexpr int Y = A<void>::Y;
clang++ -std=c++17 main.cpp
main.cpp:7:19: error: constexpr variable 'Y' must be initialized by a constant
expression
constexpr int Y = A<void>::Y;
^~~~~~~~~~
1 error generated.
This error is produced with any Clang version starting with 5.0.0 (where
sufficient C++17 support appeared). It compiles with GCC (7.1 and newer).
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