From 3bf1daa6595a410d92d421fa77be50ec58c13c12 Mon Sep 17 00:00:00 2001
From: Duncan Ogilvie <mr.exodia.tpodt@gmail.com>
Date: Fri, 26 Jul 2024 22:29:20 +0200
Subject: [PATCH] Generalize zig-toolchain.cmake

---
 README.md                          |  7 ++++++
 cmake/zig-rc.cmd                   |  2 ++
 cmake/zig-rc.sh                    |  2 ++
 cmake/zig-toolchain-aarch64.cmake  | 20 ++-------------
 cmake/zig-toolchain-winarm64.cmake |  2 ++
 cmake/zig-toolchain.cmake          | 40 ++++++++++++++++++++++++++++++
 6 files changed, 55 insertions(+), 18 deletions(-)
 create mode 100644 cmake/zig-rc.cmd
 create mode 100755 cmake/zig-rc.sh
 create mode 100644 cmake/zig-toolchain-winarm64.cmake
 create mode 100644 cmake/zig-toolchain.cmake

diff --git a/README.md b/README.md
index 9dbd25a..ab74cd3 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,10 @@ Reference: https://zig.news/kristoff/cross-compile-a-c-c-project-with-zig-3599
 - [Install zig](https://ziglang.org/learn/getting-started/#installing-zig) in your PATH (`choco install zig` on Windows)
 - `cmake -B build-aarch64 -G Ninja -DCMAKE_TOOLCHAIN_FILE=cmake/zig-toolchain-aarch64.cmake`
 - `cmake --build build-arch64`
+
+You can create toolchains for other triples like this. Here is an example to build for Windows on ARM64:
+
+```cmake
+set(ZIG_TARGET "aarch64-windows-gnu")
+include(${CMAKE_CURRENT_LIST_DIR}/zig-toolchain.cmake)
+```
diff --git a/cmake/zig-rc.cmd b/cmake/zig-rc.cmd
new file mode 100644
index 0000000..7111f45
--- /dev/null
+++ b/cmake/zig-rc.cmd
@@ -0,0 +1,2 @@
+@echo off
+zig rc %*
\ No newline at end of file
diff --git a/cmake/zig-rc.sh b/cmake/zig-rc.sh
new file mode 100755
index 0000000..4be7275
--- /dev/null
+++ b/cmake/zig-rc.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+zig rc "$@"
diff --git a/cmake/zig-toolchain-aarch64.cmake b/cmake/zig-toolchain-aarch64.cmake
index ea7cd0f..764383b 100644
--- a/cmake/zig-toolchain-aarch64.cmake
+++ b/cmake/zig-toolchain-aarch64.cmake
@@ -1,18 +1,2 @@
-if(CMAKE_GENERATOR MATCHES "Visual Studio")
-    message(FATAL_ERROR "Visual Studio generator not supported, use: cmake -G Ninja")
-endif()
-set(CMAKE_SYSTEM_NAME "Linux")
-set(CMAKE_SYSTEM_VERSION 1)
-set(CMAKE_SYSTEM_PROCESSOR "aarch64")
-set(CMAKE_C_COMPILER "zig" cc -target aarch64-linux-gnu)
-set(CMAKE_CXX_COMPILER "zig" c++ -target aarch64-linux-gnu)
-
-if(WIN32)
-    set(SCRIPT_SUFFIX ".cmd")
-else()
-    set(SCRIPT_SUFFIX ".sh")
-endif()
-
-# This is working (thanks to Simon for finding this trick)
-set(CMAKE_AR "${CMAKE_CURRENT_LIST_DIR}/zig-ar${SCRIPT_SUFFIX}")
-set(CMAKE_RANLIB "${CMAKE_CURRENT_LIST_DIR}/zig-ranlib${SCRIPT_SUFFIX}")
+set(ZIG_TARGET "aarch64-linux-gnu")
+include(${CMAKE_CURRENT_LIST_DIR}/zig-toolchain.cmake)
diff --git a/cmake/zig-toolchain-winarm64.cmake b/cmake/zig-toolchain-winarm64.cmake
new file mode 100644
index 0000000..a292187
--- /dev/null
+++ b/cmake/zig-toolchain-winarm64.cmake
@@ -0,0 +1,2 @@
+set(ZIG_TARGET "aarch64-windows-gnu")
+include(${CMAKE_CURRENT_LIST_DIR}/zig-toolchain.cmake)
diff --git a/cmake/zig-toolchain.cmake b/cmake/zig-toolchain.cmake
new file mode 100644
index 0000000..e344587
--- /dev/null
+++ b/cmake/zig-toolchain.cmake
@@ -0,0 +1,40 @@
+include_guard()
+
+if(CMAKE_GENERATOR MATCHES "Visual Studio")
+    message(FATAL_ERROR "Visual Studio generator not supported, use: cmake -G Ninja")
+endif()
+
+if(NOT ZIG_TARGET MATCHES "^([a-zZ-Z0-9_]+)-([a-zZ-Z0-9_]+)-([a-zZ-Z0-9_]+)$")
+    message(FATAL_ERROR "Expected -DZIG_TARGET=<arch>-<os>-<abi>")
+endif()
+
+set(ZIG_ARCH ${CMAKE_MATCH_1})
+set(ZIG_OS ${CMAKE_MATCH_2})
+set(ZIG_ABI ${CMAKE_MATCH_3})
+
+if(ZIG_OS STREQUAL "linux")
+    set(CMAKE_SYSTEM_NAME "Linux")
+elseif(ZIG_OS STREQUAL "windows")
+    set(CMAKE_SYSTEM_NAME "Windows")
+elseif(ZIG_OS STREQUAL "macos")
+    set(CMAKE_SYSTEM_NAME "Darwin")
+else()
+    message(WARNING "Unknown OS: ${ZIG_OS}")
+endif()
+
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR ${ZIG_ARCH})
+
+set(CMAKE_C_COMPILER "zig" cc -target ${ZIG_TARGET})
+set(CMAKE_CXX_COMPILER "zig" c++ -target ${ZIG_TARGET})
+
+if(WIN32)
+    set(SCRIPT_SUFFIX ".cmd")
+else()
+    set(SCRIPT_SUFFIX ".sh")
+endif()
+
+# This is working (thanks to Simon for finding this trick)
+set(CMAKE_AR "${CMAKE_CURRENT_LIST_DIR}/zig-ar${SCRIPT_SUFFIX}")
+set(CMAKE_RANLIB "${CMAKE_CURRENT_LIST_DIR}/zig-ranlib${SCRIPT_SUFFIX}")
+set(CMAKE_RC "${CMAKE_CURRENT_LIST_DIR}/zig-rc${SCRIPT_SUFFIX}")