Linking Rust using LLVM and MSVC. No MinGW at all.

test.rs

// Let's build rust programs with msvc linker!
// Started by klutzy
// Continued by Retep998

// Command line
/*
SET PATH=C:\WINDOWS;C:\WINDOWS\System32;C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64;A:\rust64\bin;A:\LLVM\bin
rustc libcore\lib.rs --target=x86_64-pc-windows -Car=llvm-ar
rustc test.rs --emit=obj --target=x86_64-pc-windows --extern core=libcore.rlib
link "test.o" "libcore.rlib" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "comdlg32.lib" "advapi32.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "odbc32.lib" "odbccp32.lib" "libcmt.lib" /LIBPATH:"C:\Program Files (x86)\Windows Kits\8.1\Lib\winv6.3\um\x64" /LIBPATH:"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\lib\amd64"
*/

#![feature(globs, lang_items)]
#![no_std]
#![no_main]

extern crate core;
use core::prelude::*;



#[lang = "begin_unwind"]
pub extern "C" fn rust_begin_unwind(_: &core::fmt::Arguments, _: &'static str, _: uint) -> ! { loop {} }
#[lang = "stack_exhausted"]
pub extern "C" fn rust_stack_exhausted() {}
#[lang = "eh_personality"]
fn rust_eh_personality() {}
#[no_mangle]
pub extern "C" fn __morestack() {}
#[no_mangle]
pub extern "C" fn __powisf2(mut a: f32, mut b: i32) -> f32 {
    let recip = b < 0;
    let mut r = 1.;
    loop {
        if b & 1 != 0 { r *= a }
        b /= 2;
        if b == 0 { break }
        a *= a;
    }
    if recip { r.recip() } else { r }
}
#[no_mangle]
pub extern "C" fn __powidf2(mut a: f64, mut b: i32) -> f64 {
    let recip = b < 0;
    let mut r = 1.;
    loop {
        if b & 1 != 0 { r *= a }
        b /= 2;
        if b == 0 { break }
        a *= a;
    }
    if recip { r.recip() } else { r }
}
#[no_mangle]
pub extern "C" fn main(_argc: int, _argv: *const *const u8) -> int {
    mymain();
    0
}

fn mymain() {
    display("Hello World!\0");
}
fn display(s: &str) {
    extern "system" {
        fn MessageBoxA(hWnd: u32, lpText: *const u8, lpCaption: *const u8, uType: u32) -> i32;
    }
    let b = s.as_ptr();
    unsafe {
        MessageBoxA(0, b, b, 0);
    }
}