Functions are mangled even if the link_name attribute is specified

[liranringel]

I'm trying to use bindgen.
When targeting i686-pc-windows-msvc on 64-bit windows host, I noticed that the generated function symbol is mangled even if the link_name attribute is specified. Bindgen already mangles the function and passes it as a value to the link_name attribute, so the function is mangled twice (which is wrong and produce a link error).

For example, with the following header:

int _stdcall foo();

Bindgen will produce:

extern "stdcall" {
    #[link_name = "_foo@0"]
    pub fn foo() -> ::std::os::raw::c_int;
}

But when I use it, I get the following linker error:
error LNK2019: unresolved external symbol __foo@0@0 referenced in function...
As you can see, the function is mangled twice. If I remove the link_name attribute, it works.

[retep998]

LLVM automatically performs calling convention decoration on symbols. This sounds like a simple case where bindgen should just not emit link_name, but if you really want to explicitly specify the calling convention decoration yourself then I believe prefixing the name with \x01 should tell LLVM to not automatically decorate symbols.

[liranringel]

@retep998 thanks