wdas · buddly27 · Oct 4, 2025 · Oct 4, 2025
diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
@@ -22,14 +22,15 @@ jobs:
       fail-fast: false
       matrix:
         usd: ["v24.08", "v25.05"]
-        python: ["3.10", "3.12"]
+        python: ["", "3.10", "3.12"]
 
-    name: "USD-${{ matrix.usd }}-py${{ matrix.python }}"
+    name: "USD-${{ matrix.usd }}${{ matrix.python != '' && format('-py{0}', matrix.python) || '-no-py' }}"
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python }}
+        if: matrix.python != ''
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
@@ -38,10 +39,14 @@ jobs:
         run: |
           sudo apt update
           sudo apt install -y libgtest-dev ninja-build
-          python -m pip install -r ${{github.workspace}}/test/requirements.txt
           mkdir -p ${{github.workspace}}/build
           mkdir -p ${{runner.temp}}/USD
 
+      - name: Install test Python deps
+        if: matrix.python != ''
+        run: |
+          python -m pip install -r ${{github.workspace}}/test/requirements.txt
+
       - name: Download USD
         working-directory: ${{runner.temp}}/USD
         run: |
@@ -57,6 +62,7 @@ jobs:
           sed -i '/BOOST_URL/ s|\.zip"|.zip/download"|' src/build_scripts/build_usd.py
 
       - name: Install USD
+        if: matrix.python != ''
         working-directory: ${{runner.temp}}/USD
         run: |
           python ./src/build_scripts/build_usd.py . \
@@ -69,7 +75,23 @@ jobs:
               --no-materialx \
               -v
 
+      - name: Install USD (without Python)
+        if: matrix.python == ''
+        working-directory: ${{runner.temp}}/USD
+        run: |
+          python ./src/build_scripts/build_usd.py . \
+              --no-tests \
+              --no-examples \
+              --no-tutorials \
+              --no-tools \
+              --no-docs \
+              --no-imaging \
+              --no-materialx \
+              --no-python \
+              -v
+
       - name: Configure & Build
+        if: matrix.python != ''
         working-directory: ${{github.workspace}}/build
         run: |
           export PYTHONPATH="${{runner.temp}}/USD/lib/python"
@@ -80,6 +102,18 @@ jobs:
               ..
           cmake --build . --config Release
 
+      - name: Configure & Build (without Python)
+        if: matrix.python == ''
+        working-directory: ${{github.workspace}}/build
+        run: |
+          cmake \
+              -D "BUILD_DOCS=OFF" \
+              -D "BUILD_PYTHON_BINDINGS=OFF" \
+              -D "CMAKE_INCLUDE_PATH=${{runner.temp}}/USD/include" \
+              -D "CMAKE_LIBRARY_PATH=${{runner.temp}}/USD/lib" \
+              ..
+          cmake --build . --config Release
+
       - name: Check for formatting errors
         working-directory: ${{github.workspace}}/build
         run: |

diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
@@ -22,25 +22,30 @@ jobs:
       fail-fast: false
       matrix:
         usd: ["v24.08", "v25.05.01"]
-        python: ["3.10", "3.12"]
+        python: ["", "3.10", "3.12"]
 
-    name: "USD-${{ matrix.usd }}-py${{ matrix.python }}"
+    name: "USD-${{ matrix.usd }}${{ matrix.python != '' && format('-py{0}', matrix.python) || '-no-py' }}"
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python }}
+        if: matrix.python != ''
         uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
 
       - name: Create Build Environment
         run: |
           vcpkg install --triplet=x64-windows gtest
-          python -m pip install -r ${{github.workspace}}\test\requirements.txt
           cmake -E make_directory ${{github.workspace}}\build
           cmake -E make_directory ${{runner.temp}}\USD
 
+      - name: Install test Python deps
+        if: matrix.python != ''
+        run: |
+          python -m pip install -r ${{github.workspace}}/test/requirements.txt
+
       - name: Download USD
         working-directory: ${{runner.temp}}/USD
         shell: cmd
@@ -58,6 +63,7 @@ jobs:
           sed -i '/BOOST_URL/ s|\.zip"|.zip/download"|' src/build_scripts/build_usd.py
 
       - name: Install USD
+        if: matrix.python != ''
         working-directory: ${{runner.temp}}/USD
         shell: cmd
         run: |
@@ -75,7 +81,28 @@ jobs:
               --no-materialx ^
               -v
 
+      - name: Install USD (without Python)
+        if: matrix.python == ''
+        working-directory: ${{runner.temp}}/USD
+        shell: cmd
+        run: |
+          call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvars64.bat"
+          set VCPKG_TARGET_TRIPLET=x64-windows
+          set CMAKE_TOOLCHAIN_FILE=%VCPKG_INSTALLATION_ROOT%/scripts/buildsystems/vcpkg.cmake
+          python ./src/build_scripts/build_usd.py . ^
+              --generator "Visual Studio 17 2022" ^
+              --no-tests ^
+              --no-examples ^
+              --no-tutorials ^
+              --no-tools ^
+              --no-docs ^
+              --no-imaging ^
+              --no-materialx ^
+              --no-python ^
+              -v
+
       - name: Configure & Build
+        if: matrix.python != ''
         shell: bash
         working-directory: ${{github.workspace}}/build
         run: |
@@ -91,6 +118,23 @@ jobs:
             ..
           cmake --build . --config Release
 
+      - name: Configure & Build (without Python)
+        if: matrix.python == ''
+        shell: bash
+        working-directory: ${{github.workspace}}/build
+        run: |
+          export PATH="${{runner.temp}}/USD/bin;${{runner.temp}}/USD/lib;${PATH}"
+          cmake \
+            -G "Visual Studio 17 2022" -A x64 \
+            -D "CMAKE_TOOLCHAIN_FILE=${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" \
+            -D "VCPKG_TARGET_TRIPLET=x64-windows" \
+            -D "BUILD_DOCS=OFF" \
+            -D "BUILD_PYTHON_BINDINGS=OFF" \
+            -D "CMAKE_INCLUDE_PATH=${{runner.temp}}/USD/include" \
+            -D "CMAKE_LIBRARY_PATH=${{runner.temp}}/USD/lib" \
+            ..
+          cmake --build . --config Release
+
       - name: Check for formatting errors
         shell: bash
         working-directory: ${{github.workspace}}/build

diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -105,11 +105,6 @@ if(BUILD_PYTHON_BINDINGS)
         CACHE INTERNAL "Python library path.")
 endif()
 
-# usd::usd target always requres Boost::Boost
-if (NOT TARGET Boost::Boost)
-    find_package(Boost REQUIRED)
-endif()
-
 add_subdirectory(src)
 
 if (BUILD_TESTS)

diff --git a/cmake/modules/FindUSD.cmake b/cmake/modules/FindUSD.cmake
@@ -85,9 +85,8 @@ if(USD_INCLUDE_DIR AND EXISTS "${USD_INCLUDE_DIR}/pxr/pxr.h")
     # if internal Boost.Python is not explicitly disabled
     if (USD_VERSION VERSION_LESS "0.25.5" OR _use_external_boost_python)
         set(USD_USE_INTERNAL_BOOST_PYTHON OFF CACHE INTERNAL "")
-        list(APPEND USD_DEPENDENCIES "Boost::boost")
         if (BUILD_PYTHON_BINDINGS)
-            list(APPEND USD_DEPENDENCIES "Boost::python")
+            list(APPEND USD_DEPENDENCIES "Boost::boost" "Boost::python")
         endif()
     endif()
 

diff --git a/doc/sphinx/release/release_notes.rst b/doc/sphinx/release/release_notes.rst
@@ -7,13 +7,14 @@ Release Notes
 .. release:: 0.9.0
      :date: Upcoming
 
-     .. change:: changed
+    .. change:: changed
 
         Performance improvements for the Merge operation.
 
     .. change:: fixed
 
-        Improved cmake packaging when building against a Python-free USD.
+        Removed the :term:`Boost` dependency for OpenUSD versions prior to
+        25.05 when Python bindings aren’t needed.
 
 .. release:: 0.8.4
     :date: 2025-07-30

diff --git a/src/unf/broker.cpp b/src/unf/broker.cpp
@@ -43,10 +43,7 @@ BrokerPtr Broker::Create(const UsdStageWeakPtr& stage)
     return Registry[stage];
 }
 
-const UsdStageWeakPtr
-Broker::GetStage() const {
-    return _stage;
-}
+const UsdStageWeakPtr Broker::GetStage() const { return _stage; }
 
 bool Broker::IsInTransaction() { return _mergers.size() > 0; }
 

diff --git a/src/unf/notice.cpp b/src/unf/notice.cpp
@@ -65,9 +65,9 @@ void ObjectsChanged::Merge(ObjectsChanged&& notice)
 {
     // Update resyncChanges if necessary.
     for (auto& path : notice._resyncChanges) {
-        const auto iter = std::find(_resyncChanges.begin(), _resyncChanges.end(), path);
-        if (iter == _resyncChanges.end())
-        {
+        const auto iter =
+            std::find(_resyncChanges.begin(), _resyncChanges.end(), path);
+        if (iter == _resyncChanges.end()) {
             _resyncChanges.emplace_back(std::move(path));
         }
     }
@@ -80,8 +80,7 @@ void ObjectsChanged::Merge(ObjectsChanged&& notice)
         {
             const auto it = std::find(
                 _resyncChanges.begin(), _resyncChanges.end(), primPath);
-            if (it != _resyncChanges.end())
-                continue;
+            if (it != _resyncChanges.end()) continue;
         }
 
         // Skip if an ancestor of the path is already in resyncedPaths.
@@ -96,8 +95,8 @@ void ObjectsChanged::Merge(ObjectsChanged&& notice)
 
         // Add infoChanges, when not already available
         {
-            const auto it = std::find(
-                _infoChanges.begin(), _infoChanges.end(), path);
+            const auto it =
+                std::find(_infoChanges.begin(), _infoChanges.end(), path);
             if (it == _infoChanges.end()) {
                 _infoChanges.push_back(std::move(path));
             }