Ubuntu_arm64 is - I think - running out of memory/CPU during the python SWIG build, so try to work around it

Author: jmarrec

.github/workflows/python_bindings.yml

@@ -287,16 +287,24 @@ jobs:
           if [ "${{ matrix.name }}" == "macOS_arm64" ]; then
             PYTHON_ARCH=arm64
             # Avoid "builtin __has_nothrow_assign is deprecated; use __is_nothrow_assignable instead" in boost/1.79 with recent clang
-            conan install . --output-folder=./build --build=missing -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release -o with_testing=False -o with_benchmark=False -c tools.build:cxxflags="['-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION -Wno-enum-constexpr-conversion']"
+            conan install . --output-folder=./build --build=missing \
+              -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release \
+              -o with_testing=False -o with_benchmark=False -o with_ruby=False \
+              -c tools.build:cxxflags="['-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION -Wno-enum-constexpr-conversion']"
           else
-            conan install . --output-folder=./build --build=missing -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release -o with_testing=False -o with_benchmark=False -c tools.build:cxxflags="['-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION']"
+            conan install . --output-folder=./build --build=missing \
+              -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release \
+              -o with_testing=False -o with_benchmark=False -o with_ruby=False \
+              -c tools.build:cxxflags="['-D_LIBCPP_ENABLE_CXX17_REMOVED_UNARY_BINARY_FUNCTION']"
           fi
         else
           if [ "${{ matrix.name }}" == "Ubuntu_arm64" ]; then
             PYTHON_ARCH=arm64
           fi
           PYTHON_VERSION=${{ steps.setup-python.outputs.python-version }}
-          conan install . --output-folder=./build --build=missing -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release -o with_testing=False -o with_benchmark=False
+          conan install . --output-folder=./build --build=missing \
+            -c tools.cmake.cmaketoolchain:generator=Ninja -s compiler.cppstd=20 -s build_type=Release \
+            -o with_testing=False -o with_benchmark=False -o with_ruby=False
         fi
         echo -e "::endgroup::"
 
@@ -309,7 +317,15 @@ jobs:
         echo -e "::endgroup::"
 
         begin_group "Build"
-        cmake --build --preset conan-release
+        if [ "${{ matrix.name }}" == "Ubuntu_arm64" ]; then
+          echo "Ubuntu_arm64 is apparently running out of memory/CPU during the build as of 2025-06-18, so work around it"
+          N=$(nproc)
+          cmake --build --preset conan-release --target openstudiolib -j $N
+          cmake --build --preset conan-release --target python_sdk -j $(($N - 2))
+          cmake --build --preset conan-release -j $(($N - 2))
+        else
+          cmake --build --preset conan-release
+        fi
         echo -e "::endgroup::"