add support for linux clang cross compiles

.gitignore

@@ -414,3 +414,9 @@ build/
 tmp*/
 _server_asset_probe/
 server-data/
+
+# Nix
+result
+result-*
+.direnv/
+.xwin-cache/

CMakeLists.txt

@@ -5,8 +5,8 @@ set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
-if(NOT WIN32)
-  message(FATAL_ERROR "This CMake build currently supports Windows only.")
+if(NOT WIN32 AND NOT CMAKE_CROSSCOMPILING)
+  message(FATAL_ERROR "This CMake build currently supports Windows only. For cross-compilation from Linux, use the clang-cl toolchain.")
 endif()
 
 if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)

COMPILE.md

@@ -72,7 +72,119 @@ cd .\build\windows64\Minecraft.Server\Debug
 ```
 
 Notes:
-- The CMake build is Windows-only and x64-only.
-- Contributors on macOS or Linux need a Windows machine or VM to build the project. Running the game via Wine is separate from having a supported build environment.
 - Post-build asset copy is automatic for `Minecraft.Client` in CMake (Debug and Release variants).
 - The game relies on relative paths (for example `Common\Media\...`), so launching from the output directory is required.
+
+## CMake (Linux x64 Cross-Compile with Clang)
+
+Cross-compile Windows x64 binaries on Linux using LLVM/Clang and the Windows SDK obtained via xwin.
+
+### Prerequisites
+
+Install the following packages (example for Ubuntu):
+
+```bash
+sudo apt install clang lld llvm cmake ninja-build rsync cargo
+```
+
+Install xwin for downloading the Windows SDK:
+
+```bash
+cargo install xwin
+```
+
+### Download Windows SDK
+
+Download and extract the Windows SDK and CRT:
+
+```bash
+xwin --accept-license splat --output ~/.cache/xwin/splat
+```
+
+Create symlinks to account for Linux filesystems being case sensitive:
+
+```bash
+WINSDK=~/.cache/xwin/splat
+ln -sf $WINSDK/sdk/include/shared/sdkddkver.h $WINSDK/sdk/include/shared/SDKDDKVer.h
+ln -sf $WINSDK/sdk/lib/um/x86_64/xinput9_1_0.lib $WINSDK/sdk/lib/um/x86_64/XInput9_1_0.lib
+ln -sf $WINSDK/sdk/lib/um/x86_64/ws2_32.lib $WINSDK/sdk/lib/um/x86_64/Ws2_32.lib
+```
+
+### Configure
+
+Set environment variables and configure CMake:
+
+```bash
+export WINSDK=~/.cache/xwin/splat
+export INCLUDE="$WINSDK/crt/include;$WINSDK/sdk/include/um;$WINSDK/sdk/include/ucrt;$WINSDK/sdk/include/shared"
+export LIB="$WINSDK/crt/lib/x86_64;$WINSDK/sdk/lib/um/x86_64;$WINSDK/sdk/lib/ucrt/x86_64"
+
+cmake -S . -B build/windows64-clang \
+  -G Ninja \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_C_COMPILER=clang-cl \
+  -DCMAKE_CXX_COMPILER=clang-cl \
+  -DCMAKE_LINKER=lld-link \
+  -DCMAKE_RC_COMPILER=llvm-rc \
+  -DCMAKE_MT=llvm-mt \
+  -DPLATFORM_DEFINES="_WINDOWS64" \
+  -DPLATFORM_NAME="Windows64" \
+  -DIGGY_LIBS="iggy_w64.lib;iggyperfmon_w64.lib;iggyexpruntime_w64.lib" \
+  -DCMAKE_SYSTEM_NAME=Windows \
+  -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded \
+  -DCMAKE_C_FLAGS="/MT -fms-compatibility -fms-extensions --target=x86_64-pc-windows-msvc -imsvc $WINSDK/crt/include -imsvc $WINSDK/sdk/include/ucrt -imsvc $WINSDK/sdk/include/um -imsvc $WINSDK/sdk/include/shared" \
+  -DCMAKE_CXX_FLAGS="/MT -fms-compatibility -fms-extensions --target=x86_64-pc-windows-msvc -imsvc $WINSDK/crt/include -imsvc $WINSDK/sdk/include/ucrt -imsvc $WINSDK/sdk/include/um -imsvc $WINSDK/sdk/include/shared" \
+  -DCMAKE_ASM_MASM_FLAGS="-m64" \
+  -DCMAKE_EXE_LINKER_FLAGS="-libpath:$WINSDK/crt/lib/x86_64 -libpath:$WINSDK/sdk/lib/um/x86_64 -libpath:$WINSDK/sdk/lib/ucrt/x86_64"
+```
+
+### Build
+
+Build Release:
+
+```bash
+cmake --build build/windows64-clang --config Release
+```
+
+Build specific target:
+
+```bash
+cmake --build build/windows64-clang --config Release --target Minecraft.Client
+cmake --build build/windows64-clang --config Release --target Minecraft.Server
+```
+
+### Run with Wine
+
+Run executable:
+
+```bash
+cd build/windows64-clang/Minecraft.Client
+wine ./Minecraft.Client.exe
+```
+
+Run dedicated server:
+
+```bash
+cd build/windows64-clang/Minecraft.Server
+wine ./Minecraft.Server.exe -port 25565 -bind 0.0.0.0 -name DedicatedServer
+```
+
+### NixOS / Nix
+
+For NixOS or systems with Nix installed, use the provided flake:
+
+```bash
+nix build .#client
+nix build .#server
+```
+
+Or enter the development shell with all dependencies:
+
+```bash
+nix develop
+```
+
+Notes:
+- Requires LLVM 15+ with clang-cl, lld-link, llvm-rc, and llvm-mt.
+- The xwin tool downloads ~1GB of SDK files on first run.
+- Wine is required to run the compiled Windows executables on Linux.

Minecraft.Client/AbstractContainerScreen.cpp

@@ -1,14 +1,14 @@
 #include "stdafx.h"
 #include "AbstractContainerScreen.h"
 #include "ItemRenderer.h"
-#include "MultiplayerLocalPlayer.h"
+#include "MultiPlayerLocalPlayer.h"
 #include "Lighting.h"
 #include "GameMode.h"
 #include "KeyMapping.h"
 #include "Options.h"
-#include "..\Minecraft.World\net.minecraft.world.inventory.h"
-#include "..\Minecraft.World\net.minecraft.locale.h"
-#include "..\Minecraft.World\net.minecraft.world.item.h"
+#include "../Minecraft.World/net.minecraft.world.inventory.h"
+#include "../Minecraft.World/net.minecraft.locale.h"
+#include "../Minecraft.World/net.minecraft.world.item.h"
 
 ItemRenderer *AbstractContainerScreen::itemRenderer = new ItemRenderer();
 

Minecraft.Client/AbstractProjectileDispenseBehavior.cpp

@@ -1,8 +1,8 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\net.minecraft.core.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.projectile.h"
-#include "..\Minecraft.World\net.minecraft.world.level.tile.h"
-#include "..\Minecraft.World\net.minecraft.world.level.h"
+#include "../Minecraft.World/net.minecraft.core.h"
+#include "../Minecraft.World/net.minecraft.world.entity.projectile.h"
+#include "../Minecraft.World/net.minecraft.world.level.tile.h"
+#include "../Minecraft.World/net.minecraft.world.level.h"
 #include "AbstractProjectileDispenseBehavior.h"
 
 shared_ptr<ItemInstance> AbstractProjectileDispenseBehavior::execute(BlockSource *source, shared_ptr<ItemInstance> dispensed)

Minecraft.Client/AbstractProjectileDispenseBehavior.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "..\Minecraft.World\DefaultDispenseItemBehavior.h"
+#include "../Minecraft.World/DefaultDispenseItemBehavior.h"
 
 class Projectile;
 

Minecraft.Client/AbstractTexturePack.cpp

@@ -1,8 +1,8 @@
 #include "stdafx.h"
 #include "Textures.h"
 #include "AbstractTexturePack.h"
-#include "..\Minecraft.World\InputOutputStream.h"
-#include "..\Minecraft.World\StringHelpers.h"
+#include "../Minecraft.World/InputOutputStream.h"
+#include "../Minecraft.World/StringHelpers.h"
 #include "Common/UI/UI.h"
 
 AbstractTexturePack::AbstractTexturePack(DWORD id, File *file, const wstring &name, TexturePack *fallback) : id(id), name(name)

Minecraft.Client/AchievementPopup.cpp

@@ -4,10 +4,10 @@
 #include "Font.h"
 #include "Textures.h"
 #include "Lighting.h"
-#include "..\Minecraft.World\System.h"
-#include "..\Minecraft.World\net.minecraft.locale.h"
-#include "..\Minecraft.World\net.minecraft.stats.h"
-#include "..\Minecraft.World\SharedConstants.h"
+#include "../Minecraft.World/System.h"
+#include "../Minecraft.World/net.minecraft.locale.h"
+#include "../Minecraft.World/net.minecraft.stats.h"
+#include "../Minecraft.World/SharedConstants.h"
 
 AchievementPopup::AchievementPopup(Minecraft *mc)
 {

Minecraft.Client/AchievementScreen.cpp

@@ -8,10 +8,10 @@
 #include "Textures.h"
 #include "StatsCounter.h"
 #include "ItemRenderer.h"
-#include "..\Minecraft.World\System.h"
-#include "..\Minecraft.World\net.minecraft.locale.h"
-#include "..\Minecraft.World\net.minecraft.world.level.tile.h"
-#include "..\Minecraft.World\JavaMath.h"
+#include "../Minecraft.World/System.h"
+#include "../Minecraft.World/net.minecraft.locale.h"
+#include "../Minecraft.World/net.minecraft.world.level.tile.h"
+#include "../Minecraft.World/JavaMath.h"
 
 
 

Minecraft.Client/AchievementScreen.h

@@ -1,6 +1,6 @@
 #pragma once
 #include "Screen.h"
-#include "..\Minecraft.World\net.minecraft.stats.h"
+#include "../Minecraft.World/net.minecraft.stats.h"
 class StatsCounter;
 
 class AchievementScreen : public Screen

Minecraft.Client/ArchiveFile.cpp

@@ -1,7 +1,7 @@
 #include "stdafx.h"
 
-#include "..\Minecraft.World\StringHelpers.h"
-#include "..\Minecraft.World\compression.h"
+#include "../Minecraft.World/StringHelpers.h"
+#include "../Minecraft.World/compression.h"
 
 #include "ArchiveFile.h"
 

Minecraft.Client/ArchiveFile.h

@@ -3,8 +3,8 @@
 #include <vector>
 #include <unordered_map>
 
-#include "..\Minecraft.World\File.h"
-#include "..\Minecraft.World\ArrayWithLength.h"
+#include "../Minecraft.World/File.h"
+#include "../Minecraft.World/ArrayWithLength.h"
 
 using namespace std;
 

Minecraft.Client/ArrowRenderer.cpp

@@ -1,7 +1,7 @@
 #include "stdafx.h"
 #include "ArrowRenderer.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.projectile.h"
-#include "..\Minecraft.World\Mth.h"
+#include "../Minecraft.World/net.minecraft.world.entity.projectile.h"
+#include "../Minecraft.World/Mth.h"
 
 ResourceLocation ArrowRenderer::ARROW_LOCATION = ResourceLocation(TN_ITEM_ARROWS);
 

Minecraft.Client/BatModel.cpp

@@ -1,5 +1,5 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.ambient.h"
+#include "../Minecraft.World/net.minecraft.world.entity.ambient.h"
 #include "BatModel.h"
 #include "ModelPart.h"
 

Minecraft.Client/BatRenderer.cpp

@@ -1,5 +1,5 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.ambient.h"
+#include "../Minecraft.World/net.minecraft.world.entity.ambient.h"
 #include "BatRenderer.h"
 #include "BatModel.h"
 

Minecraft.Client/BeaconRenderer.cpp

@@ -1,6 +1,6 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\net.minecraft.world.level.tile.entity.h"
-#include "..\Minecraft.World\net.minecraft.world.level.h"
+#include "../Minecraft.World/net.minecraft.world.level.tile.entity.h"
+#include "../Minecraft.World/net.minecraft.world.level.h"
 #include "BeaconRenderer.h"
 #include "Tesselator.h"
 

Minecraft.Client/BlazeModel.cpp

@@ -1,5 +1,5 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\Mth.h"
+#include "../Minecraft.World/Mth.h"
 #include "BlazeModel.h"
 #include "ModelPart.h"
 

Minecraft.Client/BlazeRenderer.cpp

@@ -1,6 +1,6 @@
 #include "stdafx.h"
 #include "BlazeModel.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.monster.h"
+#include "../Minecraft.World/net.minecraft.world.entity.monster.h"
 #include "BlazeRenderer.h"
 
 ResourceLocation BlazeRenderer::BLAZE_LOCATION = ResourceLocation(TN_MOB_BLAZE);

Minecraft.Client/BoatRenderer.cpp

@@ -1,8 +1,8 @@
 #include "stdafx.h"
 #include "BoatRenderer.h"
 #include "BoatModel.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.item.h"
-#include "..\Minecraft.World\Mth.h"
+#include "../Minecraft.World/net.minecraft.world.entity.item.h"
+#include "../Minecraft.World/Mth.h"
 
 ResourceLocation BoatRenderer::BOAT_LOCATION = ResourceLocation(TN_ITEM_BOAT);
 

Minecraft.Client/BookModel.cpp

@@ -1,5 +1,5 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\Mth.h"
+#include "../Minecraft.World/Mth.h"
 #include "BookModel.h"
 #include "ModelPart.h"
 

Minecraft.Client/BreakingItemParticle.cpp

@@ -1,9 +1,9 @@
 #include "stdafx.h"
 #include "BreakingItemParticle.h"
 #include "Tesselator.h"
-#include "..\Minecraft.World\net.minecraft.world.level.tile.h"
-#include "..\Minecraft.World\net.minecraft.world.item.h"
-#include "..\Minecraft.World\net.minecraft.world.h"
+#include "../Minecraft.World/net.minecraft.world.level.tile.h"
+#include "../Minecraft.World/net.minecraft.world.item.h"
+#include "../Minecraft.World/net.minecraft.world.h"
 
 void BreakingItemParticle::_init(Item *item, Textures *textures, int data)
 {	

Minecraft.Client/BubbleParticle.cpp

@@ -1,10 +1,10 @@
 #include "stdafx.h"
 #include "BubbleParticle.h"
-#include "..\Minecraft.World\Random.h"
-#include "..\Minecraft.World\Mth.h"
-#include "..\Minecraft.World\JavaMath.h"
-#include "..\Minecraft.World\net.minecraft.world.level.h"
-#include "..\Minecraft.World\net.minecraft.world.level.material.h"
+#include "../Minecraft.World/Random.h"
+#include "../Minecraft.World/Mth.h"
+#include "../Minecraft.World/JavaMath.h"
+#include "../Minecraft.World/net.minecraft.world.level.h"
+#include "../Minecraft.World/net.minecraft.world.level.material.h"
 
 BubbleParticle::BubbleParticle(Level *level, double x, double y, double z, double xa, double ya, double za) : Particle(level, x, y, z, xa, ya, za)
 	{

Minecraft.Client/BufferedImage.cpp

@@ -1,7 +1,7 @@
 #include "stdafx.h"
-#include "..\Minecraft.World\StringHelpers.h"
+#include "../Minecraft.World/StringHelpers.h"
 #include "Textures.h"
-#include "..\Minecraft.World\ArrayWithLength.h"
+#include "../Minecraft.World/ArrayWithLength.h"
 #include "BufferedImage.h"
 
 #ifdef _XBOX

Minecraft.Client/Camera.cpp

@@ -1,10 +1,10 @@
 #include "stdafx.h"
 #include "Camera.h"
 #include "MemoryTracker.h"
-#include "..\Minecraft.World\net.minecraft.world.entity.player.h"
-#include "..\Minecraft.World\net.minecraft.world.level.h"
-#include "..\Minecraft.World\net.minecraft.world.level.tile.h"
-#include "..\Minecraft.World\TilePos.h"
+#include "../Minecraft.World/net.minecraft.world.entity.player.h"
+#include "../Minecraft.World/net.minecraft.world.level.h"
+#include "../Minecraft.World/net.minecraft.world.level.tile.h"
+#include "../Minecraft.World/TilePos.h"
 
 float Camera::xPlayerOffs = 0.0f;
 float Camera::yPlayerOffs = 0.0f;

Minecraft.Client/Camera.h

@@ -1,6 +1,6 @@
 #pragma once
-#include "..\Minecraft.World\FloatBuffer.h"
-#include "..\Minecraft.World\IntBuffer.h"
+#include "../Minecraft.World/FloatBuffer.h"
+#include "../Minecraft.World/IntBuffer.h"
 
 
 class TilePos;

Minecraft.Client/ChatScreen.cpp

@@ -2,10 +2,10 @@
 #include "ChatScreen.h"
 #include "ClientConnection.h"
 #include "Font.h"
-#include "MultiplayerLocalPlayer.h"
-#include "..\Minecraft.World\SharedConstants.h"
-#include "..\Minecraft.World\StringHelpers.h"
-#include "..\Minecraft.World\ChatPacket.h"
+#include "MultiPlayerLocalPlayer.h"
+#include "../Minecraft.World/SharedConstants.h"
+#include "../Minecraft.World/StringHelpers.h"
+#include "../Minecraft.World/ChatPacket.h"
 
 const wstring ChatScreen::allowedChars = SharedConstants::acceptableLetters;
 vector<wstring> ChatScreen::s_chatHistory;