Compiler error in g++

[micsolutions]

Declaring an array with auto using constexpr will result in an internal compiler error when using riscv32-unknown-elf-g++:

  // 1) No problems:
  constexpr std::array<float, 3> test1 = {1.0f, 2.0f, 3.0f};

  // 2) internal compiler error
  constexpr auto test2 = std::array<float, 3>{1.0f, 2.0f, 3.0f};

Here is the full error message:

internal compiler error: in reshape_init_r, at cp/decl.c:6043
   constexpr auto test2 = std::array<float, 3>{1.0f, 2.0f, 3.0f};
                  ^~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.

- Fabian

[micsolutions]

Another possibly related bug:

const auto x = std::array{1.0f, 2.0f, 3.0f};
const auto y = std::array{4.0f, 5.0f, 6.0f};

// error: the value of 'x' is not usable in a constant expression
static_assert(x.size() == y.size());

// Works fine by itself:
constexpr auto xSize = x.size();
constexpr auto ySize = y.size();

// error: the value of 'xSize' is not usable in a constant expression
static_assert(xSize == ySize);

- Fabian