Check the S-Function build with GitHub Actions.

.github/workflows/cpp-python-build.yml

@@ -139,6 +139,47 @@ jobs:
           name: ManyLinux-Wheels.binaries
           path: build/python/dist/*-manylinux*.whl
 
+  Matlab-SFunction-Linux:
+    name: Matlab S-Function (Linux)
+    needs: Linux
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout JSBSim
+        uses: actions/checkout@v2
+      - name: Set up Matlab
+        uses: matlab-actions/setup-matlab@v1
+        with:
+          release: R2020b
+      - name: Configure JSBSim
+        run: |
+          mkdir build && cd build
+          cmake -DCMAKE_C_FLAGS_DEBUG="-g -Wall" -DCMAKE_CXX_FLAGS_DEBUG="-g -Wall" -DCMAKE_BUILD_TYPE=Debug -DBUILD_MATLAB_SFUNCTION=ON ..
+      - name: Build JSBSim S-Function
+        working-directory: build
+        run: cmake --build . --target JSBSim_SFunction -- -j2
+      - name: Prepare Tests
+        working-directory: matlab
+        # The script will be run from the directory 'matlab' so we need to link
+        # the folders that will be used by JSBSim
+        run: |
+          ln -s ../aircraft aircraft
+          ln -s ../engine engine
+          ln -s ../systems systems
+          ln -s ../scripts scripts
+      - name: Run Tests
+        uses: matlab-actions/run-command@v1
+        env:
+          # Force Matlab using the system libstdc++ rather than its own.
+          # See https://stackoverflow.com/questions/37921139/error-version-glibcxx-3-4-21-not-found
+          LD_PRELOAD: /lib/x86_64-linux-gnu/libstdc++.so.6
+        with:
+          command: addpath('build/matlab'), run('matlab/TestJSBSim.m')
+      - name: Upload Files for Release
+        uses: actions/upload-artifact@v2
+        with:
+          name: Matlab-SFunction.binaries
+          path: build/matlab/JSBSim_SFunction.mex*
+
   Windows-MinGW32:
     if: ${{ !startsWith(github.event.head_commit.message, '[skip ci]') || github.event_name == 'pull_request' }}
     name: C/C++ build (MinGW32)

CMakeLists.txt

@@ -95,6 +95,16 @@ if(BUILD_JULIA_PACKAGE)
   add_subdirectory(julia)
 endif(BUILD_JULIA_PACKAGE)
 
+################################################################################
+# Build the Matlab S-Function                                                  #
+################################################################################
+
+option(BUILD_MATLAB_SFUNCTION "Set to ON to build the Matlab S-Function for JSBSim" OFF)
+
+if(BUILD_MATLAB_SFUNCTION)
+  add_subdirectory(matlab)
+endif(BUILD_MATLAB_SFUNCTION)
+
 ################################################################################
 # Build the unit tests (needs CxxTest)                                         #
 ################################################################################

matlab/CMakeLists.txt

@@ -0,0 +1,8 @@
+find_package(Matlab)
+
+if(Matlab_FOUND)
+  matlab_add_mex(NAME JSBSim_SFunction SRC JSBSim_SFunction.cpp JSBSimInterface.cpp
+                 LINK_TO libJSBSim)
+  target_include_directories(JSBSim_SFunction PUBLIC ${CMAKE_SOURCE_DIR}/src
+                             ${Matlab_ROOT_DIR}/simulink/include)
+endif(Matlab_FOUND)

matlab/TestJSBSim.m

@@ -0,0 +1,6 @@
+disp('Run 737 example');
+fprintf('Current directory: %s', pwd)
+sim('ex737cruise');
+clear functions;
+clear all;
+disp('JSBSim S-Function Reset');

matlab/readme.txt

@@ -1,15 +1,15 @@
-Short instruction to how to use the S-function to integrate JSBSim with Simulink 
+Short instruction to how to use the S-function to integrate JSBSim with Simulink
 
-1. Build and install JSBSim. 
-2. Open Matlab and navigate to the JSBSim folder. 
-3. Open JSBSimSimulinkCompile and uncomment either the Linux or Windows mex row. 
-4. Run JSBSimSimulinkCompile in the Matlab command window. Note that the compiler needed is gcc8. 
-5. Open the Simulink example ex737cruise.slx and press run. 
-6. Once the simulation is completed, run the clearSF.m file before running the Simulink program again. 
+1. Build and install JSBSim.
+2. Open Matlab and navigate to the JSBSim folder.
+3. Open JSBSimSimulinkCompile and uncomment either the Linux or Windows mex row.
+4. Run JSBSimSimulinkCompile in the Matlab command window. Note that the compiler needed is gcc8.
+5. Open the Simulink example ex737cruise.slx and press run.
+6. Once the simulation is completed, run the clearSF.m file before running the Simulink program again.
 
 
 
-NOTE: 
-* clearSF.m needs to be run after each Simulation. 
+NOTE:
+* clearSF.m needs to be run after each Simulation.
 * The simulation can either be run from a script or from input from Simulink.
- 
+