bloat-free true/false and necessary build stuff

Cargo.toml

@@ -3,7 +3,10 @@ name = "coreutils"
 version = "0.0.1"
 edition = "2021"
 license = "AGPL-3.0-or-later"
-authors = [ "Emma Tebibyte <emma@tebibyte.media>" ]
+authors = [
+    "Emma Tebibyte <emma@tebibyte.media>",
+    "silt <silt@tebibyte.media>"
+]
 
 [dependencies]
 

build.rs

@@ -0,0 +1,4 @@
+fn main() {
+	println!("cargo:rustc-link-arg-bin=true=-nostartfiles");
+	println!("cargo:rustc-link-arg-bin=false=-nostartfiles");
+}

src/bin/false.rs

@@ -1,4 +1,22 @@
-// Copyright (c) 2022 Emma Tebibyte
+// Copyright (c) 2022 silt <silt@tebibyte.media>
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-fn main() { std::process::exit(1); }
+#![feature(lang_items, start)]
+#![no_main]
+#![no_std]
+
+use core::panic::PanicInfo;
+use core::arch::asm;
+
+#[lang = "eh_personality"] extern fn rust_eh_personality() {}
+#[lang = "panic_impl"] extern fn rust_begin_panic(_: &PanicInfo) -> ! { loop {} }
+
+#[no_mangle]
+pub unsafe fn _start() -> ! {
+	asm!(
+	"syscall",
+	in("rax") 60,  // Syscall number
+	in("rdi") 1,   // Exit code
+	options(noreturn)
+	)
+}

src/bin/true.rs

@@ -1,4 +1,22 @@
-// Copyright (c) 2022 Emma Tebibyte
+// Copyright (c) 2022 silt <silt@tebibyte.media>
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
-fn main() { }
+#![feature(lang_items, start)]
+#![no_main]
+#![no_std]
+
+use core::panic::PanicInfo;
+use core::arch::asm;
+
+#[lang = "eh_personality"] extern fn rust_eh_personality() {}
+#[lang = "panic_impl"] extern fn rust_begin_panic(_: &PanicInfo) -> ! { loop {} }
+
+#[no_mangle]
+pub unsafe fn _start() -> ! {
+	asm!(
+	"syscall",
+	in("rax") 60,  // Syscall number
+	in("rdi") 0,   // Exit code
+	options(noreturn)
+	)
+}