Add /MP flag for MSVC multiprocessor builds, remove unity build. (#1644)

CedricGuillemet · Copilot · Copilot · web-flow · commit 1f57a2e89f71 · 2026-03-26T14:20:45.000+01:00
## Description

Adds the MSVC `/MP` (multiprocessor compilation) flag to the root
CMakeLists.txt, enabling parallel compilation of source files when
building with MSVC.
Remove Unity build as not mandatory for BRN Windows prebuilt binaries.

## Changes

- Added `add_compile_options(/MP)` in the existing MSVC compiler-flags
block in the root `CMakeLists.txt`.

Note: build time decrease is not that significant on the CI. Should be
better with local builds.
local test PG debug full rebuild.
no MP : 
```
 Build: 50 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build completed at 2:37 PM and took 01:35.764 minutes ==========
```
with MP:
```
========== Rebuild All: 50 succeeded, 0 failed, 0 skipped ==========
========== Rebuild completed at 2:42 PM and took 01:01.454 minutes ==========
```

---------

Co-authored-by: Copilot &lt;223556219+Copilot@users.noreply.github.com&gt;
Co-authored-by: Copilot &lt;175728472+Copilot@users.noreply.github.com&gt;
diff --git a/.github/jobs/ios.yml b/.github/jobs/ios.yml
@@ -19,7 +19,7 @@ jobs:
         displayName: "Select Xcode $(XCODE_VERSION)"
 
       - script: |
-          cmake -G Xcode -B build/iOS -D IOS=ON -D DEPLOYMENT_TARGET=${{parameters.deploymentTarget}} -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_DEBUG_TRACE=ON -D CMAKE_IOS_INSTALL_COMBINED=NO
+          cmake -G Xcode -B build/iOS -D IOS=ON -D DEPLOYMENT_TARGET=${{parameters.deploymentTarget}} -D BABYLON_DEBUG_TRACE=ON -D CMAKE_IOS_INSTALL_COMBINED=NO
         displayName: "Generate iOS solution"
 
       - task: Xcode@5
diff --git a/.github/jobs/linux.yml b/.github/jobs/linux.yml
@@ -28,7 +28,7 @@ jobs:
         displayName: "Install packages"
 
       - script: |
-          cmake -G Ninja -B build/Linux -D JAVASCRIPTCORE_LIBRARY=/usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.1.so -D NAPI_JAVASCRIPT_ENGINE=${{parameters.JSEngine}} -D CMAKE_BUILD_TYPE=RelWithDebInfo -D BX_CONFIG_DEBUG=ON -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D OpenGL_GL_PREFERENCE=GLVND -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG) .
+          cmake -G Ninja -B build/Linux -D JAVASCRIPTCORE_LIBRARY=/usr/lib/x86_64-linux-gnu/libjavascriptcoregtk-4.1.so -D NAPI_JAVASCRIPT_ENGINE=${{parameters.JSEngine}} -D CMAKE_BUILD_TYPE=RelWithDebInfo -D BX_CONFIG_DEBUG=ON -D OpenGL_GL_PREFERENCE=GLVND -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG) .
           ninja -C build/Linux
         displayName: "Build X11"
 
diff --git a/.github/jobs/macos.yml b/.github/jobs/macos.yml
@@ -23,7 +23,7 @@ jobs:
         displayName: "Select XCode $(XCODE_VERSION)"
 
       - script: |
-          cmake -G "${{parameters.generator}}" -B build/macOS -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG) -D BABYLON_NATIVE_TESTS_USE_NOOP_METAL_DEVICE=ON
+          cmake -G "${{parameters.generator}}" -B build/macOS -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG) -D BABYLON_NATIVE_TESTS_USE_NOOP_METAL_DEVICE=ON
         displayName: "Generate macOS solution"
 
       - script: |
diff --git a/.github/jobs/test_install_ios.yml b/.github/jobs/test_install_ios.yml
@@ -19,7 +19,7 @@ jobs:
         displayName: "Select Xcode $(XCODE_VERSION)"
 
       - script: |
-          cmake -B build/iOS -G Xcode -D IOS=ON -D DEPLOYMENT_TARGET=${{parameters.deploymentTarget}} -D CMAKE_IOS_INSTALL_COMBINED=NO -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON 
+          cmake -B build/iOS -G Xcode -D IOS=ON -D DEPLOYMENT_TARGET=${{parameters.deploymentTarget}} -D CMAKE_IOS_INSTALL_COMBINED=NO -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
         displayName: "Configure"
 
       - script: |
diff --git a/.github/jobs/test_install_linux.yml b/.github/jobs/test_install_linux.yml
@@ -25,7 +25,7 @@ jobs:
         displayName: "Install packages"
 
       - script: |
-          cmake -B build/Linux -G Ninja -D CMAKE_BUILD_TYPE=RelWithDebInfo -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
+          cmake -B build/Linux -G Ninja -D CMAKE_BUILD_TYPE=RelWithDebInfo -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
         displayName: "Configure"
 
       - script: |
diff --git a/.github/jobs/test_install_macos.yml b/.github/jobs/test_install_macos.yml
@@ -18,7 +18,7 @@ jobs:
         displayName: "Select XCode $(XCODE_VERSION)"
 
       - script: |
-          cmake -B build/macOS -G Xcode -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
+          cmake -B build/macOS -G Xcode -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
         displayName: "Configure"
 
       - script: |
diff --git a/.github/jobs/test_install_win32.yml b/.github/jobs/test_install_win32.yml
@@ -19,7 +19,7 @@ jobs:
           vmImage: ${{parameters.vmImage}}
 
       - script: |
-          cmake -B build/Win32 -G "Visual Studio 17 2022" -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
+          cmake -B build/Win32 -G "Visual Studio 17 2022" -D BABYLON_NATIVE_BUILD_APPS=OFF -D BABYLON_DEBUG_TRACE=ON
         displayName: "Configure"
 
       - script: |
diff --git a/.github/jobs/uwp.yml b/.github/jobs/uwp.yml
@@ -32,7 +32,7 @@ jobs:
           vmImage: ${{parameters.vmImage}}
 
       - script: |
-          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -D CMAKE_SYSTEM_NAME=WindowsStore -D CMAKE_SYSTEM_VERSION=10.0 ${{variables.jsEngineDefine}} -A ${{parameters.platform}} -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BABYLON_DEBUG_TRACE=ON
+          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -D CMAKE_SYSTEM_NAME=WindowsStore -D CMAKE_SYSTEM_VERSION=10.0 ${{variables.jsEngineDefine}} -A ${{parameters.platform}} -D BABYLON_DEBUG_TRACE=ON
         displayName: "Generate ${{variables.solutionName}} solution"
 
       - task: VSBuild@1
diff --git a/.github/jobs/win32.yml b/.github/jobs/win32.yml
@@ -44,7 +44,7 @@ jobs:
 
       # BGFX_CONFIG_MAX_FRAME_BUFFERS is set so enough Framebuffers are available before V8 starts disposing unused ones
       - script: |
-          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -A ${{parameters.platform}} ${{variables.jsEngineDefine}} -D BX_CONFIG_DEBUG=ON -D GRAPHICS_API=${{parameters.graphics_api}} -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BGFX_CONFIG_MAX_FRAME_BUFFERS=256 -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG)
+          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -A ${{parameters.platform}} ${{variables.jsEngineDefine}} -D BX_CONFIG_DEBUG=ON -D GRAPHICS_API=${{parameters.graphics_api}} -D BGFX_CONFIG_MAX_FRAME_BUFFERS=256 -D BABYLON_DEBUG_TRACE=ON -D ENABLE_SANITIZERS=$(SANITIZER_FLAG)
         displayName: "Generate ${{variables.solutionName}} solution"
 
       - task: MSBuild@1
diff --git a/.github/jobs/win32_precompiled_shader_test.yml b/.github/jobs/win32_precompiled_shader_test.yml
@@ -21,7 +21,7 @@ jobs:
           vmImage: ${{parameters.vmImage}}
 
       - script: |
-          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -A ${{parameters.platform}} -D BX_CONFIG_DEBUG=ON -D GRAPHICS_API=D3D11 -D CMAKE_UNITY_BUILD=$(UNITY_BUILD) -D BGFX_CONFIG_MAX_FRAME_BUFFERS=256 -D BABYLON_DEBUG_TRACE=ON -D BABYLON_NATIVE_PLUGIN_NATIVEENGINE_COMPILESHADERS=OFF
+          cmake -G "Visual Studio 17 2022" -B build/${{variables.solutionName}} -A ${{parameters.platform}} -D BX_CONFIG_DEBUG=ON -D GRAPHICS_API=D3D11 -D BGFX_CONFIG_MAX_FRAME_BUFFERS=256 -D BABYLON_DEBUG_TRACE=ON -D BABYLON_NATIVE_PLUGIN_NATIVEENGINE_COMPILESHADERS=OFF
         displayName: "Generate ${{variables.solutionName}} solution"
 
       - script: |
diff --git a/Apps/HeadlessScreenshotApp/CMakeLists.txt b/Apps/HeadlessScreenshotApp/CMakeLists.txt
@@ -11,7 +11,6 @@ set(DIRECTX_ARCH ${CMAKE_VS_PLATFORM_NAME})
 
 FetchContent_MakeAvailable_With_Message(DirectXTK)
 
-set_property(TARGET DirectXTK PROPERTY UNITY_BUILD false)
 set_property(TARGET DirectXTK PROPERTY FOLDER Apps/Dependencies)
 
 set(BABYLON_SCRIPTS
diff --git a/Apps/Playground/Android/BabylonNative/build.gradle b/Apps/Playground/Android/BabylonNative/build.gradle
@@ -16,10 +16,6 @@ if (project.hasProperty("GRAPHICS_API")) {
     }
 }
 
-def unity_build = "false"
-if (project.hasProperty("UNITY_BUILD")) {
-    unity_build = project.property("UNITY_BUILD")
-}
 def arcore_libpath = layout.buildDirectory.dir("arcore-native").get().asFile.absolutePath
 
 configurations { natives }
@@ -46,7 +42,6 @@ android {
                     "-DARCORE_LIBPATH=${arcore_libpath}/jni",
                     "-DNAPI_JAVASCRIPT_ENGINE=${jsEngine}",
                     "-DBABYLON_NATIVE_BUILD_APPS=ON",
-                    "-DCMAKE_UNITY_BUILD=${unity_build}",
                     "-DBABYLON_DEBUG_TRACE=ON"
                 cppFlags += ["-Wno-deprecated-literal-operator"]
             }
diff --git a/Apps/Playground/Android/app/build.gradle b/Apps/Playground/Android/app/build.gradle
@@ -11,10 +11,6 @@ def graphics_api = "OpenGL"
 // min 24 for Vulkan
 def platformVersion = 25
 
-def unity_build = "false"
-if (project.hasProperty("UNITY_BUILD")) {
-    unity_build = project.property("UNITY_BUILD")
-}
 def arcore_libpath = layout.buildDirectory.dir("arcore-native").get().asFile.absolutePath
 
 configurations { natives }
diff --git a/Apps/Playground/CMakeLists.txt b/Apps/Playground/CMakeLists.txt
@@ -214,7 +214,6 @@ if(APPLE)
             FOLDER "Playground")
     endif()
     enable_objc_arc(Playground)
-    set_property(TARGET Playground PROPERTY UNITY_BUILD false)
     set_property(TARGET Playground PROPERTY XCODE_ATTRIBUTE_CODE_SIGNING_ALLOWED YES)
 endif()
 
diff --git a/Apps/PrecompiledShaderTest/CMakeLists.txt b/Apps/PrecompiledShaderTest/CMakeLists.txt
@@ -62,7 +62,6 @@ if(WIN32)
 
     if(NOT TARGET DirectXTK)
         FetchContent_MakeAvailable_With_Message(DirectXTK)
-        set_property(TARGET DirectXTK PROPERTY UNITY_BUILD false)
         set_property(TARGET DirectXTK PROPERTY FOLDER Apps/Dependencies)
     endif()
 
@@ -104,7 +103,6 @@ target_link_libraries(PrecompiledShaderTest
 
 if(APPLE)
     enable_objc_arc(PrecompiledShaderTest)
-    set_property(TARGET PrecompiledShaderTest PROPERTY UNITY_BUILD false)
 endif()
 
 # ---- Copy assets to output directory ----
diff --git a/Apps/UnitTests/CMakeLists.txt b/Apps/UnitTests/CMakeLists.txt
@@ -47,8 +47,6 @@ elseif(WIN32)
 endif()
 
 add_executable(UnitTests ${BABYLONJS_ASSETS} ${BABYLONJS_MATERIALS_ASSETS} ${TEST_ASSETS} ${SOURCES})
-set_property(TARGET UnitTests PROPERTY UNITY_BUILD false)
-
 target_link_libraries(UnitTests
     PRIVATE AppRuntime
     PRIVATE Blob
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -225,6 +225,9 @@ if(MSVC)
 
     # default to /W3
     add_compile_options(/W3)
+
+    # Enable multiprocessor compilation for faster builds
+    add_compile_options(/MP)
 endif()
 
 if(APPLE)
diff --git a/Core/Graphics/CMakeLists.txt b/Core/Graphics/CMakeLists.txt
@@ -60,7 +60,6 @@ elseif(APPLE)
 endif()
 
 set_property(TARGET Graphics PROPERTY FOLDER Core)
-set_property(TARGET Graphics PROPERTY UNITY_BUILD false)
 
 source_group(TREE ${CMAKE_CURRENT_SOURCE_DIR} FILES ${SOURCES})
 
diff --git a/Dependencies/CMakeLists.txt b/Dependencies/CMakeLists.txt
@@ -71,13 +71,9 @@ elseif(GRAPHICS_API STREQUAL "Vulkan")
     target_compile_definitions(bgfx PRIVATE BGFX_CONFIG_RENDERER_VULKAN=1)
 endif()
 set_property(TARGET bimg PROPERTY FOLDER Dependencies/bgfx/3rdparty)
-set_property(TARGET bimg PROPERTY UNITY_BUILD false)
 set_property(TARGET bimg_encode PROPERTY FOLDER Dependencies/bgfx/3rdparty)
-set_property(TARGET bimg_encode PROPERTY UNITY_BUILD false)
 set_property(TARGET bimg_decode PROPERTY FOLDER Dependencies/bgfx/3rdparty)
-set_property(TARGET bimg_decode PROPERTY UNITY_BUILD false)
 set_property(TARGET minz PROPERTY FOLDER Dependencies/bgfx/3rdparty)
-set_property(TARGET minz PROPERTY UNITY_BUILD false)
 if(TARGET tinyexr)
     set_property(TARGET tinyexr PROPERTY FOLDER Dependencies/bgfx/3rdparty)
 endif()
@@ -86,10 +82,6 @@ set_property(TARGET bimg PROPERTY FOLDER Dependencies/bgfx)
 set_property(TARGET bx PROPERTY FOLDER Dependencies/bgfx)
 target_compile_definitions(bx PRIVATE _CRT_SECURE_NO_WARNINGS)
 
-if(APPLE)
-    set_property(TARGET bgfx PROPERTY UNITY_BUILD false)
-endif()
-
 if(UNIX AND NOT APPLE AND NOT ANDROID)
     # Use GLVND libraries for EGL support in bgfx
     set(OpenGL_GL_PREFERENCE GLVND)
@@ -152,16 +144,6 @@ endif()
 # --------------------------------------------------
 FetchContent_MakeAvailable_With_Message(JsRuntimeHost)
 
-set_property(TARGET JsRuntime PROPERTY UNITY_BUILD false)
-if(TARGET AppRuntime)
-    set_property(TARGET AppRuntime PROPERTY UNITY_BUILD false)
-endif()
-
-if(WIN32)
-    # UrlLib does not support unity build on win32
-    set_property(TARGET UrlLib PROPERTY UNITY_BUILD false)
-endif()
-
 # --------------------------------------------------
 # metal-cpp
 # --------------------------------------------------
@@ -278,7 +260,6 @@ if(BABYLON_NATIVE_PLUGIN_NATIVEENGINE_WEBP)
     set(WEBP_BUILD_EXTRAS OFF)
     FetchContent_MakeAvailable_With_Message(libwebp)
 
-    set_property(TARGET sharpyuv PROPERTY UNITY_BUILD false)
     set_property(TARGET sharpyuv PROPERTY FOLDER Dependencies/libwebp)
     set_property(TARGET webp PROPERTY FOLDER Dependencies/libwebp)
     set_property(TARGET webpdecode PROPERTY FOLDER Dependencies/libwebp)
diff --git a/Dependencies/xr/CMakeLists.txt b/Dependencies/xr/CMakeLists.txt
@@ -46,7 +46,6 @@ target_compile_definitions(xr PRIVATE _CRT_SECURE_NO_WARNINGS)
 
 if (APPLE)
     enable_objc_arc(xr)
-    set_property(TARGET xr PROPERTY UNITY_BUILD false)
 endif()
 
 if (ANDROID)
diff --git a/Plugins/NativeCamera/CMakeLists.txt b/Plugins/NativeCamera/CMakeLists.txt
@@ -36,7 +36,6 @@ elseif(APPLE)
     set(ADDITIONAL_LIBRARIES
         PRIVATE "-framework CoreMedia -framework AVFoundation")
     enable_objc_arc(NativeCamera)
-    set_property(TARGET NativeCamera PROPERTY UNITY_BUILD false)
 endif()
 
 target_link_libraries(NativeCamera
diff --git a/Plugins/TestUtils/CMakeLists.txt b/Plugins/TestUtils/CMakeLists.txt
@@ -20,7 +20,6 @@ target_compile_definitions(TestUtils PRIVATE GRAPHICS_API=${GRAPHICS_API})
 
 if(APPLE)
     enable_objc_arc(TestUtils)
-    set_property(TARGET TestUtils PROPERTY UNITY_BUILD false)
 endif()
 
 set_property(TARGET TestUtils PROPERTY FOLDER Plugins)
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -9,8 +9,6 @@ variables:
     value: 3.31.6
   - name: NDK_VERSION
     value: 28.2.13676358
-  - name: UNITY_BUILD
-    value: true
   - name: XCODE_VERSION
     value: 16.4
 
