From bba4790ff762235bf54bd9eb1716db0123d76363 Mon Sep 17 00:00:00 2001
From: Lucas Schwiderski <lucas@lschwiderski.de>
Date: Thu, 25 May 2023 23:37:53 +0200
Subject: [PATCH] feat: Implement cross-compiling to MSVC

---
 .fdignore           |  4 ++++
 .gitignore          | 13 +++++------
 Cargo.toml          | 13 +++++++++++
 Justfile            | 54 +++++++++++++++++++++++++++++++++++++++++++++
 rust-toolchain.toml |  4 ++++
 rustfmt.toml        | 20 +++++++++++++++++
 6 files changed, 100 insertions(+), 8 deletions(-)
 create mode 100644 .fdignore
 create mode 100644 Justfile
 create mode 100644 rust-toolchain.toml
 create mode 100644 rustfmt.toml

diff --git a/.fdignore b/.fdignore
new file mode 100644
index 0000000..306cc3a
--- /dev/null
+++ b/.fdignore
@@ -0,0 +1,4 @@
+/msvc
+/target
+/.xwin-cache
+/.wineprefix
diff --git a/.gitignore b/.gitignore
index 9ce42ca..d391e22 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,6 @@
+.envrc
 /target
-
-
-# Added by cargo
-#
-# already existing elements were commented out
-
-#/target
-/Cargo.lock
+/msvc
+/tools/xwin
+/.xwin-cache
+/.wineprefix
diff --git a/Cargo.toml b/Cargo.toml
index d157fa5..d083bef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,5 +5,18 @@ members = [
     "lib/nat_traversal"
 ]
 
+[unstable]
+build-std = true
+
 # [profile.dev.package.backtrace]
 # opt-level = 3
+
+[profile.release]
+strip = "debuginfo"
+
+# The MSVC toolchain cannot handle LTO properly. Some symbol related to
+# panic unwind would always be missing.
+# So we use a separate profile for when we can compile with LTO.
+[profile.release-lto]
+inherits = "release"
+lto = true
diff --git a/Justfile b/Justfile
new file mode 100644
index 0000000..57b5fa9
--- /dev/null
+++ b/Justfile
@@ -0,0 +1,54 @@
+xwin_version := '0.2.12'
+xwin_prefix := 'xwin-' + xwin_version + '-x86_64-unknown-linux-musl'
+
+export WINEPREFIX := justfile_directory() + "/.wineprefix"
+export WINEDEBUG := '-all'
+
+# Note that we only disable unused-command-line-argument here since clang-cl
+# doesn't implement all of the options supported by cl, but the ones it doesn't
+# are _generally_ not interesting.
+CL_FLAGS := "-Wno-unused-command-line-argument -fuse-ld=lld-link ./msvc/crt/include ./msvc/sdk/include/ucrt ./msvc/sdk/include/um ./msvc/sdk/include/shared"
+
+export CC_x86_64_pc_windows_msvc := "clang-cl"
+export CXX_x86_64_pc_windows_msvc := "clang-cl"
+export AR_x86_64_pc_windows_msvc := "llvm-lib"
+# Use wine to run test executables
+export CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUNNER := "wine"
+# Let cargo know what linker to invoke if you haven't already specified it
+# in a .cargo/config.toml file
+export CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER := "lld-link"
+export CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_RUSTFLAGS := "-Lnative=./msvc/crt/lib/x86_64 -Lnative=./msvc/sdk/lib/um/x86_64 -Lnative=./msvc/sdk/lib/ucrt/x86_64"
+export CFLAGS_x86_64_pc_windows_msvc := CL_FLAGS
+export CXXFLAGS_x86_64_pc_windows_msvc := CL_FLAGS
+
+default: build
+
+build: start-wineserver
+    cargo build -Zbuild-std --target x86_64-pc-windows-msvc
+    [ -d "$game_dir" ] && cp ./target/x86_64-pc-windows-msvc/debug/dt_p2p.dll "$game_dir/binaries/plugins/dt_p2p_debug_pluginw64_release.dll"
+
+[no-exit-message]
+wine *ARGS:
+    @wine {{ ARGS }}
+
+start-wineserver:
+    #!/bin/sh
+    set -eu
+
+    bold=$(tput bold)
+    normal=$(tput sgr0)
+
+    mkdir -p "$WINEPREFIX"
+    if ! pgrep wineserver >/dev/null; then
+        echo "${bold}wineserver -p${normal}"
+        wineserver -p
+        echo "${bold}wine wineboot --init --update${normal}"
+        wine wineboot --init --update
+    fi
+
+setup-msvc:
+    rustup target add x86_64-pc-windows-msvc
+    rustup component add rust-src
+    mkdir -p ./tools
+    curl --fail -L https://github.com/Jake-Shadle/xwin/releases/download/{{ xwin_version }}/{{ xwin_prefix }}.tar.gz | tar -xzv -C ./tools --strip-components=1 {{ xwin_prefix }}/xwin
+    ./tools/xwin --accept-license splat --include-debug-libs --output ./msvc
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..6b745bd
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly"
+components = ["rust-src"]
+targets = ["x86_64-pc-windows-msvc"]
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..a031646
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,20 @@
+# Copyright (C) 2022  Lucas Schwiderski
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+unstable_features = true
+hard_tabs = false
+max_width = 100
+edition = "2021"
+use_field_init_shorthand = true