Add Python::has_minimum_version

src/KIM/kim_property.cpp

@@ -75,24 +75,20 @@ using namespace LAMMPS_NS;
 
 kimProperty::kimProperty(LAMMPS *lmp) : Pointers(lmp)
 {
-#if LMP_PYTHON
-#if PY_MAJOR_VERSION != 3
-  error->all(FLERR, "Invalid Python version.\n"
-                    "The kim-property Python package requires Python "
-                    "3 >= 3.6 support.");
-#endif
   // one-time initialization of Python interpreter
   python->init();
-#else
-  error->all(FLERR, "Error Python support missing! Compile with PYTHON "
-                    "package installed!");
-#endif // LMP_PYTHON
+
+  if (!python->has_minimum_version(3, 6)) {
+    error->all(FLERR, "Invalid Python version.\n"
+                      "The kim-property Python package requires Python "
+                      "3 >= 3.6 support.");
+  }
 }
 
 void kimProperty::command(int narg, char **arg)
 {
 #if LMP_PYTHON
-#if PY_MAJOR_VERSION == 3
+#if PY_MAJOR_VERSION >= 3
   if (narg < 2)
     error->all(FLERR, "Invalid `kim_property` command.");
 

src/PYTHON/python_impl.cpp

@@ -535,3 +535,10 @@ void PythonImpl::deallocate(int i)
   delete [] pfuncs[i].ovarname;
   delete [] pfuncs[i].longstr;
 }
+
+/* ------------------------------------------------------------------ */
+
+bool PythonImpl::has_minimum_version(int major, int minor)
+{
+    return (PY_MAJOR_VERSION == major && PY_MINOR_VERSION >= minor) || (PY_MAJOR_VERSION > major);
+}

src/PYTHON/python_impl.h

@@ -32,6 +32,7 @@ class PythonImpl : protected Pointers, public PythonInterface {
   char *long_string(int);
   int execute_string(char *);
   int execute_file(char *);
+  bool has_minimum_version(int major, int minor);
 
  private:
   int ninput,noutput,length_longstr;

src/lmppython.cpp

@@ -117,3 +117,11 @@ int Python::execute_file(char *fname)
   init();
   return impl->execute_file(fname);
 }
+
+/* ------------------------------------------------------------------ */
+
+bool Python::has_minimum_version(int major, int minor)
+{
+  init();
+  return impl->has_minimum_version(major, minor);
+}

src/lmppython.h

@@ -28,6 +28,7 @@ public:
   virtual char * long_string(int ifunc) = 0;
   virtual int execute_string(char *) = 0;
   virtual int execute_file(char *) = 0;
+  virtual bool has_minimum_version(int major, int minor) = 0;
 };
 
 class Python : protected Pointers {
@@ -42,6 +43,7 @@ public:
   char * long_string(int ifunc);
   int execute_string(char *);
   int execute_file(char *);
+  bool has_minimum_version(int major, int minor);
 
   bool is_enabled() const;
   void init();