Replace cargo-xbuild with build-std

Author: crawfxrd

Cargo.lock

@@ -3,10 +3,6 @@ name = "system76_firmware_update"
 version = "1.0.0"
 edition = "2018"
 
-[package.metadata.cargo-xbuild]
-memcpy = true
-sysroot_path = "build/xbuild"
-
 [lib]
 name = "system76_firmware_update"
 path = "src/lib.rs"
@@ -20,6 +16,7 @@ redox_dmi = "0.1.5"
 redox_hwio = "0.1.0"
 redox_uefi = "0.1.0"
 redox_uefi_std = "0.1.1"
+rlibc = "1.0"
 system76_ecflash = { git = "https://github.com/system76/ecflash.git" }
 system76_ectool = { git = "https://github.com/system76/ec.git" }
 

Cargo.toml

@@ -76,7 +76,8 @@ $(BUILD)/boot.o: $(BUILD)/boot.a
 $(BUILD)/boot.a: Cargo.lock Cargo.toml src/* src/*/*
 	mkdir -p $(BUILD)
 	rustup component add rust-src
-	cargo xrustc \
+	cargo rustc \
+		-Z build-std=core,alloc \
 		--lib \
 		--target $(TARGET) \
 		--release \

Makefile

@@ -6,7 +6,7 @@
 #![feature(try_trait)]
 
 extern crate alloc;
-
+extern crate rlibc;
 #[macro_use]
 extern crate uefi_std as std;