Created attachment 46733 [details]
Output of "gcc -v" and the compilation error

This bug report is based on the stackoverflow discussion that can be found here: https://stackoverflow.com/questions/57559634/initialization-of-an-array-of-non-moveable-objects-why-does-such-code-fail-to-c

Here's the code that fails to compile on GCC:


class Test // non-copyable and non-movable class with virtual functions
{
public:
    Test() = delete;

    Test(const Test&) = delete;
    Test(Test&&) = delete;
    Test& operator=(const Test&) = delete;
    Test& operator=(Test&&) = delete;

    Test(int a, int b) : a_(a), b_(b) {}
    virtual ~Test() {}

    int a_;
    int b_;
};

//----------------

class B
{
public:
/*(1)*/ B() : test_{{1, 2}, {3, 4}} {} // Does not compile on GCC

private:
        Test test_[2];
};

//---------------- 

int main()
{
    B b;
    Test test[2] = {{1, 2}, {3, 4}}; // Successfully compiles
}


GCC 9.2 outputs:

<source>: In constructor 'B::B()':
<source>:23:35: error: use of deleted function 'Test::Test(Test&&)'
   23 | /*(1)*/ B() : test_{{1, 2}, {3, 4}} {} // Does not compile on GCC
      |                                   ^
<source>:7:5: note: declared here
    7 |     Test(Test&&) = delete;
      |     ^~~~

Other related information (the system type, the options given when GCC was configured/built, the complete command line that triggers the bug, the compiler output) is contained in the attached text file. Basically, this output was taken from the https://godbolt.org/ online compiler. But all other compilers that I've tried give the same error.
A preprocessed file (*.i*) is NOT included because I have "reduced the testcase to a small file that doesn't include any other file" (item "ii" from Detailed bug reporting instructions).

As explained by user L. F. on stackoverflow, this code is expected to be compiled successfully without requiring a move constructor.