Add option to build as shared lib (#198)

Author: walbourn

.github/workflows/main.yml

@@ -102,6 +102,10 @@ jobs:
       working-directory: ${{ github.workspace }}
       run: cmake --build out\build\${{ matrix.build_type }}
 
+    - name: 'Clean up'
+      working-directory: ${{ github.workspace }}
+      run: Remove-Item -Path out -Recurse -Force
+
     - if: matrix.arch != 'amd64_arm64'
       name: 'Configure CMake (Spectre)'
       working-directory: ${{ github.workspace }}
@@ -111,3 +115,16 @@ jobs:
       name: 'Build (Spectre)'
       working-directory: ${{ github.workspace }}
       run: cmake --build out\build\${{ matrix.build_type }}
+
+    - if: matrix.arch != 'amd64_arm64'
+      name: 'Clean up'
+      working-directory: ${{ github.workspace }}
+      run: Remove-Item -Path out -Recurse -Force
+
+    - name: 'Configure CMake (DLL)'
+      working-directory: ${{ github.workspace }}
+      run: cmake --preset=${{ matrix.build_type }} -DBUILD_SHARED_LIBS=ON
+
+    - name: 'Build (DLL)'
+      working-directory: ${{ github.workspace }}
+      run: cmake --build out\build\${{ matrix.build_type }}

.github/workflows/test.yml

@@ -100,3 +100,15 @@ jobs:
     - name: 'Build'
       working-directory: ${{ github.workspace }}
       run: cmake --build out\build\${{ matrix.build_type }}
+
+    - name: 'Clean up'
+      working-directory: ${{ github.workspace }}
+      run: Remove-Item -Path out -Recurse -Force
+
+    - name: 'Configure CMake (DLL)'
+      working-directory: ${{ github.workspace }}
+      run: cmake --preset=${{ matrix.build_type }} -DBUILD_TESTING=ON -DBUILD_TOOLS=OFF -DBUILD_SHARED_LIBS=ON1
+
+    - name: 'Build (DLL)'
+      working-directory: ${{ github.workspace }}
+      run: cmake --build out\build\${{ matrix.build_type }}

.github/workflows/wsl.yml

@@ -73,3 +73,22 @@ jobs:
     - name: 'Build'
       working-directory: ${{ github.workspace }}
       run: cmake --build out/build/${{ matrix.build_type }}
+
+    - name: 'Clean up'
+      working-directory: ${{ github.workspace }}
+      run: rm -rf out
+
+    - name: 'Configure CMake (-shared)'
+      working-directory: ${{ github.workspace }}
+      run: >
+        cmake --preset=${{ matrix.build_type }}
+        -DCMAKE_TOOLCHAIN_FILE="${{ github.workspace }}/vcpkg/scripts/buildsystems/vcpkg.cmake" -DVCPKG_MANIFEST_DIR="${{ github.workspace }}/build"
+        -DVCPKG_TARGET_TRIPLET="x64-linux" -DBUILD_SHARED_LIBS=ON
+
+      env:
+        CC: gcc-${{ matrix.gcc }}
+        CXX: g++-${{ matrix.gcc }}
+
+    - name: 'Build (-shared)'
+      working-directory: ${{ github.workspace }}
+      run: cmake --build out/build/${{ matrix.build_type }}

CMakeLists.txt

@@ -17,6 +17,8 @@ project(DirectXMesh
 
 option(BUILD_TOOLS "Build meshconvert" ON)
 
+option(BUILD_SHARED_LIBS "Build DirectXMesh as a shared library" OFF)
+
 # Includes the support for DirectX 12 input layouts
 option(BUILD_DX12 "Build with DirectX12 Runtime support" ON)
 
@@ -70,7 +72,20 @@ set(LIBRARY_SOURCES
     DirectXMesh/DirectXMeshVBWriter.cpp
     DirectXMesh/DirectXMeshWeldVertices.cpp)
 
-add_library(${PROJECT_NAME} STATIC ${LIBRARY_SOURCES} ${LIBRARY_HEADERS})
+if(WIN32 AND BUILD_SHARED_LIBS)
+  message(STATUS "Build library as a DLL")
+
+  configure_file(
+      "${CMAKE_CURRENT_SOURCE_DIR}/build/DirectXMesh.rc.in"
+      "${CMAKE_CURRENT_BINARY_DIR}/DirectXMesh.rc" @ONLY)
+
+  add_library(${PROJECT_NAME} SHARED ${LIBRARY_SOURCES} ${LIBRARY_HEADERS} "${CMAKE_CURRENT_BINARY_DIR}/DirectXMesh.rc")
+
+  target_compile_definitions(${PROJECT_NAME} PRIVATE DIRECTX_MESH_EXPORT)
+  target_compile_definitions(${PROJECT_NAME} INTERFACE DIRECTX_MESH_IMPORT)
+else()
+  add_library(${PROJECT_NAME} ${LIBRARY_SOURCES} ${LIBRARY_HEADERS})
+endif()
 
 source_group(${PROJECT_NAME} REGULAR_EXPRESSION DirectXMesh/*.*)