Add arm64 windows prebuilt

.github/workflows/build.yml

@@ -35,9 +35,7 @@ jobs:
             triplet: osx-release
             vcpkg-root: /usr/local/share/vcpkg
             extra-args: --overlay-triplets=./triplets
-        exclude:
-          - build: windows
-            arch: arm64
+
     steps:
       - uses: actions/checkout@v4
 

triplets/arm64-win-llvm-static-release.cmake

@@ -0,0 +1,26 @@
+# This triplet is tested in vcpkg ci via https://github.com/microsoft/vcpkg/pull/25897
+set(VCPKG_TARGET_ARCHITECTURE arm64)
+set(VCPKG_CRT_LINKAGE static)
+set(VCPKG_LIBRARY_LINKAGE static)
+set(VCPKG_BUILD_TYPE release)
+
+## Toolchain setup
+set(VCPKG_CHAINLOAD_TOOLCHAIN_FILE "${CMAKE_CURRENT_LIST_DIR}/x64-win-llvm/x64-win-llvm.toolchain.cmake")
+set(VCPKG_LOAD_VCVARS_ENV ON) # Setting VCPKG_CHAINLOAD_TOOLCHAIN_FILE deactivates automatic vcvars setup so reenable it!
+
+if(DEFINED VCPKG_PLATFORM_TOOLSET)
+    set(VCPKG_PLATFORM_TOOLSET ClangCL)
+endif()
+set(VCPKG_ENV_PASSTHROUGH_UNTRACKED "LLVMInstallDir;LLVMToolsVersion") # For the ClangCL toolset
+# set(VCPKG_QT_TARGET_MKSPEC win32-clang-msvc) # For Qt5
+
+## Policy settings
+set(VCPKG_POLICY_SKIP_ARCHITECTURE_CHECK enabled)
+set(VCPKG_POLICY_SKIP_DUMPBIN_CHECKS enabled)
+
+set(VCPKG_CMAKE_CONFIGURE_OPTIONS 
+      "-DCMAKE_TRY_COMPILE_CONFIGURATION=Release"
+    )
+
+include("${CMAKE_CURRENT_LIST_DIR}/x64-win-llvm/extra_setup.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/x64-win-llvm/port_specialization.cmake")

triplets/x64-win-llvm/x64-win-llvm.toolchain.cmake

@@ -35,7 +35,8 @@ set(std_c_flags "-std:c11 -D__STDC__=1 -Wno-implicit-function-declaration") #/Zc
 
 # Set Windows definitions:
 set(windows_defs "/DWIN32")
-if(VCPKG_TARGET_ARCHITECTURE STREQUAL x64)
+set(64BIT_ARCH x64 arm64)
+if(VCPKG_TARGET_ARCHITECTURE IN_LIST 64BIT_ARCH)
   string(APPEND windows_defs " /D_WIN64")
 endif()
 string(APPEND windows_defs " /D_WIN32_WINNT=0x0A00 /DWINVER=0x0A00") # tweak for targeted windows
@@ -55,6 +56,8 @@ set(arch_flags "-mcrc32")
 # -msse4.2 for everything which normally cl can use. (Otherwise strict sse2 only.)
 if(VCPKG_TARGET_ARCHITECTURE STREQUAL x86)
   string(APPEND arch_flags " -m32 --target=i686-pc-windows-msvc")
+elseif(VCPKG_TARGET_ARCHITECTURE STREQUAL arm64)
+  string(APPEND arch_flags " --target=arm64-pc-windows-msvc")
 endif()
 # /Za unknown