feat(build, ci): enable unity builds

Author: SuperFola

.github/workflows/setup-compilers/action.yaml

@@ -102,7 +102,8 @@ runs:
          -DARK_COVERAGE=${{ inputs.coverage }} \
          -DARK_BUILD_EXE=On \
          -DARK_BUILD_MODULES=$ToggleModules -DARK_MOD_ALL=$ToggleModules -DARK_MOD_DRAFT=$ToggleModules \
-         -DARK_TESTS=On
+         -DARK_TESTS=On \
+         -DARK_UNITY_BUILD=On
         cmake --build build --config $BUILD_TYPE -j $(nproc)
 
     - name: Configure CMake Ark

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.12)
+cmake_minimum_required(VERSION 3.16)
 
 project(ark CXX)
 
@@ -22,6 +22,7 @@ option(ARK_SANITIZERS "Enable ASAN and UBSAN" Off)
 option(ARK_TESTS "Build ArkScript unit tests" Off)
 option(ARK_BENCHMARKS "Build ArkScript benchmarks" Off)
 option(ARK_COVERAGE "Enable coverage while building (clang, gcc) (requires ARK_TESTS to be On)" Off)
+option(ARK_UNITY_BUILD "Enable unity build" Off)
 
 include(cmake/link_time_optimization.cmake)
 include(cmake/sanitizers.cmake)
@@ -53,6 +54,11 @@ target_include_directories(ArkReactor
         ${ark_SOURCE_DIR}/include)
 target_compile_features(ArkReactor PRIVATE cxx_std_20)
 
+if (ARK_UNITY_BUILD)
+    set_target_properties(ArkReactor PROPERTIES UNITY_BUILD ON UNITY_BUILD_MODE BATCH UNITY_BUILD_BATCH_SIZE 16)
+    set_source_files_properties(src/arkreactor/VM/VM.cpp PROPERTIES SKIP_UNITY_BUILD_INCLUSION true)
+endif ()
+
 if (CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG OR APPLE)
     message(STATUS "Enabling computed gotos")
     target_compile_definitions(ArkReactor PRIVATE ARK_USE_COMPUTED_GOTOS=1)
@@ -194,6 +200,10 @@ if (ARK_TESTS)
     target_compile_features(unittests PRIVATE cxx_std_20)
     target_compile_definitions(unittests PRIVATE ARK_TESTS_ROOT="${CMAKE_CURRENT_SOURCE_DIR}/")
 
+    if (ARK_UNITY_BUILD)
+        set_target_properties(unittests PROPERTIES UNITY_BUILD ON UNITY_BUILD_MODE BATCH UNITY_BUILD_BATCH_SIZE 16)
+    endif ()
+
     if (ARK_COVERAGE AND CMAKE_COMPILER_IS_CLANG)
         target_compile_options(unittests PRIVATE -coverage -fcoverage-mapping -fprofile-instr-generate)
         target_link_options(unittests PRIVATE -coverage -fcoverage-mapping -fprofile-instr-generate)
@@ -250,6 +260,10 @@ if (ARK_BUILD_EXE)
     target_link_libraries(arkscript PUBLIC ArkReactor replxx clipp)
     target_compile_features(arkscript PRIVATE cxx_std_20)
 
+    if (ARK_UNITY_BUILD)
+        set_target_properties(arkscript PROPERTIES UNITY_BUILD ON UNITY_BUILD_MODE BATCH UNITY_BUILD_BATCH_SIZE 16)
+    endif ()
+
     enable_lto(arkscript)
 
     # Installs the arkscript executable.

include/Ark/Compiler/Compiler.hpp

@@ -85,7 +85,6 @@ namespace Ark::internal
         std::vector<IR::Block> m_temp_pages;  ///< we need temporary code pages for some compilations passes
         IR::label_t m_current_label = 0;
 
-        unsigned m_debug;  ///< the debug level of the compiler
         Logger m_logger;
 
         /**

src/arkreactor/Compiler/Compiler.cpp

@@ -19,7 +19,7 @@ namespace Ark::internal
     using namespace literals;
 
     Compiler::Compiler(const unsigned debug) :
-        m_debug(debug), m_logger("Compiler", debug)
+        m_logger("Compiler", debug)
     {}
 
     void Compiler::process(const Node& ast)