Returning structs in registers - ARM ABI in GCC

Question

In the ARM ABI documentation I come across functions defined like:

__value_in_regs struct bar foo(int a, int b) {
    ...
}

but GCC(4.3

Answer 1

I'm not sure if this will work, but you can try using the pcs function attribute:

struct bar foo(int a, int b) __attribute__((pcs("aapcs")));
struct bar foo(int a, int b) {
    ...
}