Directory.Build.props

<Project>
  <!--
    Global build properties for all projects in the solution.
    This file is automatically imported by all .csproj files.
  -->
  <PropertyGroup>
    <!-- Enable C# preview features (null conditional assignment, field keyword, etc.) -->
    <LangVersion>preview</LangVersion>
    <!-- Use system protoc on Apple Silicon (ARM64) to avoid "Bad CPU type" error -->
    <!-- This works for macOS with Homebrew-installed protoc -->
    <Protobuf_Protoc Condition="'$(OS)' == 'Unix' And Exists('/opt/homebrew/bin/protoc')">/opt/homebrew/bin/protoc</Protobuf_Protoc>
    <!-- Fallback for Linux or other Unix systems with protoc in standard locations -->
    <Protobuf_Protoc Condition="'$(OS)' == 'Unix' And '$(Protobuf_Protoc)' == '' And Exists('/usr/local/bin/protoc')">/usr/local/bin/protoc</Protobuf_Protoc>
    <Protobuf_Protoc Condition="'$(OS)' == 'Unix' And '$(Protobuf_Protoc)' == '' And Exists('/usr/bin/protoc')">/usr/bin/protoc</Protobuf_Protoc>
  </PropertyGroup>
</Project>