added simple CI

.github/workflows/compile.yml

@@ -0,0 +1,15 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install OpenMPI and gfortran
+      run: sudo apt-get install gfortran libopenmpi-dev
+    - name: Compile
+      run: cd src && make

src/Makefile

@@ -62,8 +62,8 @@ $(TEST_EXE): %.exe: %.f90.o $(LIB)
 	$(LD) -o $@ $^
 
 $(EXE): $(OBJS)
-	$(FC) $(FFLAGS) $^ -o $(EXE)
 	mkdir -p $(EXEDIR)/data
+	$(FC) $(FFLAGS) $^ -o $(EXE)
 
 # Create object files from Fortran source
 $(OBJS) $(TEST_OBJS): %.o: % | %.d