Fix ARM64 nightly build: dotnet NuGet packaging broken under Ninja/cmake (#9589)

The Windows ARM64 nightly build (`mk_win_dist_cmake.py --arm64-only`)
was failing because the cmake-built `Microsoft.Z3` NuGet package was
produced without any native Windows DLL, causing the downstream dotnet
example build to fail.

## Root causes

- **Wrong DLL path in `Microsoft.Z3.csproj.in`**: Path included
`/$(_DN_CMAKE_CONFIG)/` (e.g., `.../RelWithDebInfo/libz3.dll`), but
`CMakeLists.txt` sets `CMAKE_RUNTIME_OUTPUT_DIRECTORY =
PROJECT_BINARY_DIR` with no config subdir. With Ninja single-config, the
DLL lands at `build-dir/libz3.dll`. The `Exists()` guard silently
excluded the DLL from the package.
- **Wrong runtime identifier**: ARM64 DLL was being packed under
`runtimes\win-x64\native` instead of `runtimes\win-arm64\native`.
- **Legacy copy fires for `net8.0`**: `Microsoft.Z3.targets` excluded
`netstandard`/`netcoreapp` but not modern TFMs like `net8.0`, so
`CopyToOutputDirectory` fired and failed trying to copy the absent
`win-x64` DLL.

## Changes

- **`src/api/dotnet/CMakeLists.txt`**: Introduce `Z3_DOTNET_WIN_RID`
cmake variable (`win-x64` / `win-x86` / `win-arm64`) derived from
`TARGET_ARCHITECTURE`; used at `configure_file` time.
- **`src/api/dotnet/Microsoft.Z3.csproj.in`**: Remove
`/$(_DN_CMAKE_CONFIG)` from the Windows DLL path; replace hardcoded
`runtimes\win-x64\native` with `runtimes\${Z3_DOTNET_WIN_RID}\native`.
- **`src/api/dotnet/Microsoft.Z3.targets`**: Add
`!$(TargetFramework.Contains('.'))` to the legacy-copy condition, which
correctly excludes `net5.0`/`net6.0`/`net7.0`/`net8.0` (all use dotted
TFMs) while keeping `net45`/`net472` etc.
- **`src/api/dotnet/Microsoft.Z3.props`**: Add explicit `arm64`
condition mapping `$(Platform) == 'arm64'` to
`runtimes\win-arm64\native\libz3.dll` for legacy .NET Framework ARM64
consumers.

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

src/api/dotnet/CMakeLists.txt

@@ -147,8 +147,13 @@ endforeach()
 set(Z3_DOTNET_NUPKG_VERSION "${VER_MAJOR}.${VER_MINOR}.${VER_BUILD}")
 if(TARGET_ARCHITECTURE STREQUAL "i686")
     set(Z3_DOTNET_PLATFORM "x86")
+    set(Z3_DOTNET_WIN_RID "win-x86")
+elseif(TARGET_ARCHITECTURE STREQUAL "arm64")
+    set(Z3_DOTNET_PLATFORM "AnyCPU")
+    set(Z3_DOTNET_WIN_RID "win-arm64")
 else()
     set(Z3_DOTNET_PLATFORM "AnyCPU")
+    set(Z3_DOTNET_WIN_RID "win-x64")
 endif()
 
 # TODO conditional for signing. we can then enable the ``Release_delaysign`` configuration

src/api/dotnet/Microsoft.Z3.csproj.in

@@ -84,10 +84,10 @@ ${Z3_DOTNET_COMPILE_ITEMS}
 
   <!-- TODO we may want to pack x64 and x86 native assemblies into a single nupkg -->
 
-  <!-- Native binaries x64 -->
+  <!-- Native binaries x64/arm64 -->
   <ItemGroup Condition="'$(Platform)' != 'x86'">
-    <Content Include="${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/$(_DN_CMAKE_CONFIG)/libz3.dll" Condition="Exists('${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/$(_DN_CMAKE_CONFIG)/libz3.dll')">
-      <PackagePath>runtimes\win-x64\native</PackagePath>
+    <Content Include="${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.dll" Condition="Exists('${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.dll')">
+      <PackagePath>runtimes\${Z3_DOTNET_WIN_RID}\native</PackagePath>
     </Content>
     <Content Include="${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.so" Condition="Exists('${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.so')">
       <PackagePath>runtimes\linux-x64\native</PackagePath>
@@ -99,7 +99,7 @@ ${Z3_DOTNET_COMPILE_ITEMS}
 
   <!-- Native binaries for x86; currently only Windows is supported. -->
   <ItemGroup Condition="'$(Platform)' == 'x86'">
-    <Content Include="${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/$(_DN_CMAKE_CONFIG)/libz3.dll" Condition="Exists('${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/$(_DN_CMAKE_CONFIG)/libz3.dll')">
+    <Content Include="${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.dll" Condition="Exists('${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libz3.dll')">
       <PackagePath>runtimes\win-x86\native</PackagePath>
     </Content>
   </ItemGroup>

src/api/dotnet/Microsoft.Z3.props

@@ -9,7 +9,8 @@
 
     <!-- Probe the package root path -->
     <Z3_PACKAGE_PATH Condition="('$(Z3_PACKAGE_PATH)' == '')">$(MSBuildThisFileDirectory)..\</Z3_PACKAGE_PATH>
-    <Z3_NATIVE_LIB_PATH Condition="'$(IsWindows)' == 'true' and '$(Platform)' != 'x86'">$(Z3_PACKAGE_PATH)runtimes\win-x64\native\libz3.dll</Z3_NATIVE_LIB_PATH>
+    <Z3_NATIVE_LIB_PATH Condition="'$(IsWindows)' == 'true' and '$(Platform)' == 'arm64'">$(Z3_PACKAGE_PATH)runtimes\win-arm64\native\libz3.dll</Z3_NATIVE_LIB_PATH>
+    <Z3_NATIVE_LIB_PATH Condition="'$(IsWindows)' == 'true' and '$(Platform)' != 'x86' and '$(Platform)' != 'arm64'">$(Z3_PACKAGE_PATH)runtimes\win-x64\native\libz3.dll</Z3_NATIVE_LIB_PATH>
     <Z3_NATIVE_LIB_PATH Condition="'$(IsWindows)' == 'true' and '$(Platform)' == 'x86'">$(Z3_PACKAGE_PATH)runtimes\win-x86\native\libz3.dll</Z3_NATIVE_LIB_PATH>
     <Z3_NATIVE_LIB_PATH Condition="'$(IsLinux)' == 'true'">$(Z3_PACKAGE_PATH)runtimes\linux-x64\native\libz3.so</Z3_NATIVE_LIB_PATH>
   </PropertyGroup>

src/api/dotnet/Microsoft.Z3.targets

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
 
-  <ItemGroup Condition="!$(TargetFramework.Contains('netstandard')) and !$(TargetFramework.Contains('netcoreapp'))">
+  <ItemGroup Condition="!$(TargetFramework.Contains('netstandard')) and !$(TargetFramework.Contains('netcoreapp')) and !$(TargetFramework.Contains('.'))">
     <None Include="$(Z3_NATIVE_LIB_PATH)">
       <Link>%(RecursiveDir)%(FileName)%(Extension)</Link>
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>