https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65815
--- Comment #4 from Daniel Krügler <daniel.kruegler at googlemail dot com> --- (In reply to andras.aszodi from comment #3) > The problem manifests itself if the array is a member variable in a class > and initialised "inline". Details in my new comment below. There are no details anywhere. Please keep in mind that a complete code example is generally required for an issue. So, if I understand you correctly, you have the following code in mind: //------------------------------ #include <array> struct X { std::array<double, 3> q1 = {1.0, -1.0, 1.0}; }; //------------------------------ ?