// main.rs
#![feature(lang_items)]
#![feature(no_core)]

#![feature(libc)]
#![no_core]

extern crate libc;
extern crate core;

use libc::printf;
use core::panic::PanicInfo;

#[no_mangle]
pub unsafe extern "C" fn _main(argc: i32, argv: *const *const u8) -> i32 {
  printf("Hello, world!\n\00".as_ptr() as *const i8);
  return 0;
}

#[lang = "eh_personality"]
#[no_mangle]
pub extern "C" fn eh_personality() {}

#[panic_handler]
#[no_mangle]
pub extern "C" fn panic_handler(p: &PanicInfo) -> ! {
  loop {} // never return
}

// main.c
int _main(int _, char **__);

int main(int argc, char **argv) { return _main(argc, argv); }

# Makefile
RUSTC := rustc      # rust compiler
RUSTDOC := rustdoc  # rust doc generator

# compiler flags
RUSTCFLAGS := -O --color auto
RUSTDOCFLAGS := -v

# default target
RUSTTARGET := x86_64-unknown-linux-gnu
RUSTCFLAGS := $(RUSTCFLAGS) --target $(RUSTTARGET)

ifeq ($(DEBUG), 1) # use debug info
        RUSTCFLAGS := $(RUSTCFLAGS) -g -v
endif

snappy: main.c libsnappy.a
        $(CC) $(CFLAGS) $? -o $@
libsnappy.a: main.rs
        $(RUSTC) $(RUSTCFLAGS) $? --crate-type staticlib --crate-name snappy