https://bugs.llvm.org/show_bug.cgi?id=50711
Bug ID: 50711
Summary: Bug: undefined behavior of constexpr static_cast from
int to unscoped enum without fixed type outside range
compiles fine on C++17
Product: clang
Version: trunk
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]
Hi,
The following code is undefined behavior in C++17. And undefined behavior is
not allowed in constant expressions - the compiler is required to diagnose it.
Adapted from cppreference:
enum foo { a = 0, b = 1 };
constexpr foo x = static_cast<foo>(123); // undefined behavior since C++17
However Clang happily compiles this code:
https://godbolt.org/z/bzhWMxqoE
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