revert: refactor: non-copyable Mbox

This reverts commit 1111419, reversing
changes made to 06f9a2c.

Author: kkebo

Makefile

@@ -7,7 +7,7 @@ SWIFT := swift
 SWIFT_BUILD_FLAGS := --triple $(TRIPLE) -c release -Xswiftc -Osize \
 					 --experimental-lto-mode=full -Xswiftc -experimental-hermetic-seal-at-link
 LD := clang -fuse-ld=lld
-LDFLAGS := --target=$(TRIPLE) -nostdlib -static -Wl,--gc-sections,--print-gc-sections,--strip-all,--allow-multiple-definition
+LDFLAGS := --target=$(TRIPLE) -nostdlib -static -Wl,--gc-sections,--print-gc-sections,--strip-all
 OBJCOPY := llvm-objcopy
 QEMU := qemu-system-aarch64
 

Package.swift

@@ -35,13 +35,12 @@ let package = Package(
         ),
         .target(
             name: "RaspberryPi",
-            dependencies: ["Font", "Support", "AsmSupport"],
+            dependencies: ["Font", "AsmSupport"],
             swiftSettings: swiftSettings + [
                 .enableExperimentalFeature("Volatile")
             ],
         ),
         .target(name: "Font", swiftSettings: swiftSettings),
-        .target(name: "Support", swiftSettings: swiftSettings),
         .target(name: "AsmSupport"),
     ],
 )

Sources/RaspberryPi/mbox.swift

@@ -13,7 +13,7 @@ let mboxFull: UInt32 = 0x8000_0000
 let mboxEmpty: UInt32 = 0x4000_0000
 
 @_alignment(16)
-struct Mbox: ~Copyable {
+struct Mbox {
     var `0`: UInt32 = 0
     var `1`: UInt32 = 0
     var `2`: UInt32 = 0