Strange array initialize expression?

Question

What is the meaning of following Code? Code is from the regression test suite of GCC.

static char * name[] = {
   [0x80000000]  = \"bar\"
};

Answer 1

It's called designated initializer which is introduced in C99, gcc also supports it in GNU89 as an extension, see here for detail.

 int a[6] = { [4] = 29, [2] = 15 };

is equivalent to

 int a[6] = { 0, 0, 15, 0, 29, 0 };