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The Linux Kernel Looks To "Bite The Bullet" In Enabling Microsoft C Extensions (www.phoronix.com)
submitted 1 month ago by CodiUnicorn@programming.dev to c/linux@lemmy.ml
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[-] Obin@feddit.org 20 points 1 month ago* (last edited 1 month ago)

You mean 'unnamed' is what's confusing you?

Normally you can do anonymous struct/union members or struct struct/union members that are tagged structs but not anonymous.

I.e. in standard C you'd have to do either:

struct foo { int baz; };
struct bar { struct foo foo; };
...
struct bar data;
data.foo.baz = 0;

or:

struct bar { struct {  int baz; } foo; };
...
struct bar data;
data.baz = 0;

but to do the following, you'd need the extension:

struct foo { int baz; };
struct bar { struct foo; };
...
struct bar data;
data.baz = 0;
[-] mina86@lemmy.wtf 8 points 1 month ago* (last edited 1 month ago)

~~Minor correction: Unnamed structs and unions (so your second example) are not part of C. They are GNU extensions.~~

[-] MinekPo1@lemmygrad.ml 3 points 1 month ago* (last edited 1 month ago)

"ANSI C" by Kernighan and Ritchie disagrees , including that syntax (note : retranslation from Polish as that's the language my copy is in) :

A8.3

[...]

struct-union-specifier:
, union-struct identifier ₒₚₜ { compound-declaration-list }
, union-struct identifier

[...]

Specifiers of structures or unions with [a compound declaration] list, but with no label [identifier], creates a unique type; it may only be referred to in the declaration in which it is part.

[-] mina86@lemmy.wtf 1 points 1 month ago

Yes, but I was talking about field name, not struct tag. And up to C99 my comment was correct.

[-] Obin@feddit.org 3 points 1 month ago* (last edited 1 month ago)

Unless I'm misunderstanding something, I'm pretty sure they've been standardized in C11. Also mentioned here.

[-] mina86@lemmy.wtf 1 points 1 month ago

You appear to be correct.

this post was submitted on 10 Nov 2025
34 points (75.8% liked)

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