Compilation failure: "cannot take address of consteval function 'GetMaskAndExpect' outside of an immediate invocation"

[PureTryOut]

src/dynarmic/frontend/decoder/decoder_detail.h:175:43: error: cannot take address of consteval function 'GetMaskAndExpect' outside of an immediate invocation
        constexpr auto mask = std::get<0>(GetMaskAndExpect(bitstring));
                                          ^
src/dynarmic/frontend/decoder/decoder_detail.h:48:27: note: declared here
    static consteval auto GetMaskAndExpect(std::array<char, opcode_bitsize> bitstring) {
                          ^
src/dynarmic/frontend/decoder/decoder_detail.h:176:45: error: cannot take address of consteval function 'GetMaskAndExpect' outside of an immediate invocation
        constexpr auto expect = std::get<1>(GetMaskAndExpect(bitstring));
                                            ^
src/dynarmic/frontend/decoder/decoder_detail.h:48:27: note: declared here
    static consteval auto GetMaskAndExpect(std::array<char, opcode_bitsize> bitstring) {
                          ^
2 errors generated.

[merryhime]

Which compiler (+version) is affected?

[PureTryOut]

This is currently with Clang 14.0.6 and the Musl libc

[wheremyfoodat]

Reproduced this issue with both Clang 12.0.0 and Clang 14.0.6 on Windows
Marking the function as constexpr instead of consteval makes it work again.

[merryhime]

Annoying. Not entirely sure where this issue is arising from; will change to constexpr.

[Macdu]

This looks like a bug in clang (dolphin-emu/dolphin#10973, although in this PR they said it was solved in clang 14.0). I think it comes from the fact that calling a consteval function outside of an immediate invocation was added later in the specification(see https://open-std.org/JTC1/SC22/WG21/docs/papers/2020/p1937r2.html).

[merryhime]

Workaround pushed af51845.

[nekopsykose]

workaround works fine with the same initial configuration