https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92003
Bug ID: 92003
Summary: constexpr-ness of char const* doesn't propagate
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: vincent.hamp at higaski dot at
Target Milestone: ---
For some reasons the compiler seems to differ between a constexpr char const*
which is directly initialized by a string literal and one which actually points
to a constexpr char array.
The last expression in the following code-snippet fails to compile on the
current trunk:
constexpr char const* get_c_str() { return "abc"; }
constexpr bool use_get_c_str_in_constexpr_context{get_c_str()}; // works
template <char... Cs>
struct string {
static constexpr char const* c_str() { return &c[0]; }
private:
static constexpr char c[]{Cs..., '\0'};
};
constexpr char const* cstr{string<'a', 'b', 'c'>::c_str()};
constexpr bool use_cstr_in_constexpr_context{cstr}; // doesn't work
https://godbolt.org/z/k3TBUC
