Allowing anonymous structs and unions

[tanuk@xxxxxx (Tanu Kaskinen)]

Hi all,

We haven't been using anonymous structs and unions so far, because
they've been non-standard in the past. C11 added support for them,
however. GCC has supported them longer than that, I don't know about
other compilers. Anonymous structs and unions are nice, and I think we
should start allowing them. Any objections?

In case the terms aren't clear, an anonymous struct looks like this:

struct foo {
    struct {
        int a;
        int b;
    };

    int c;
};

struct foo f;
f.a = 1;
f.b = 2;
f.c = 3;

So struct foo contains another struct, but that struct doesn't have a
name. Members of the inner struct are accessed as if they were members
of the outer struct.

Anonymous unions look similar:

struct foo {
    union {
        int i;
        float f;
    };
};

struct foo f;
f.i = 1;
f.f = 2.0;

-- 
Tanu