Revert "Remove obsolete Jamfile"

The enum_type_object type inherits from PyLong_Type which is not tracked
by the GC. Instances doesn't have to be tracked by the GC: remove the
Py_TPFLAGS_HAVE_GC flag.

The Python C API documentation says:

    "To create a container type, the tp_flags field of the type object
    must include the Py_TPFLAGS_HAVE_GC and provide an implementation of
    the tp_traverse handler."

https://docs.python.org/dev/c-api/gcsupport.html

The new exception was introduced in Python 3.11 by:
https://github.com/python/cpython/issues/88429

.github/workflows/deploy-documentation.yml

@@ -1,6 +1,6 @@
 name: deploy documentation
 
-on: [push, pull_request]
+on: [push]
 
 jobs:
   deploy:

.github/workflows/test-windows.yml

@@ -15,16 +15,26 @@ jobs:
     - uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+    - uses: microsoft/setup-msbuild@v1.1
     - name: setup boost prerequisites
       uses: lukka/run-vcpkg@v6
       with:
-        vcpkgGitCommitId: '8a9a97315aefb3f8bc5d81bf66ca0025938b9c91'
+        vcpkgGitCommitId: '88b1071e39f13b632644d9d953738d345a4ac055'
         vcpkgDirectory: '${{ runner.workspace }}/vcpkg'
         vcpkgTriplet: x64-windows
-        vcpkgArguments: boost-config boost-core boost-function boost-graph boost-iterator boost-lexical-cast boost-mpl boost-preprocessor boost-smart-ptr boost-static-assert boost-align
-
+        vcpkgArguments: >
+          boost-config
+          boost-core
+          boost-function
+          boost-graph
+          boost-iterator
+          boost-lexical-cast
+          boost-mpl
+          boost-preprocessor
+          boost-smart-ptr
+          boost-static-assert
+          boost-align
     - name: setup faber
-      #shell: 'bash'
       run: |
         python -m pip install --upgrade pip
         python -m pip install setuptools faber numpy

include/boost/python/call_method.hpp

@@ -59,7 +59,7 @@ call_method(PyObject* self, char const* name
     )
 {
     PyObject* const result = 
-        PyEval_CallMethod(
+        PyObject_CallMethod(
             self
             , const_cast<char*>(name)
             , const_cast<char*>("(" BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_FIXED, "O") ")")

src/exec.cpp

@@ -109,8 +109,8 @@ object BOOST_PYTHON_DECL exec_file(char const *filename, object global, object l
   PyObject *fo = Py_BuildValue("s", f);
   PyObject *fb = Py_None;
   PyUnicode_FSConverter(fo, &fb);
-  f = PyBytes_AsString(fb);
-  FILE *fs = fopen(f, "r");
+  char *f_as_uft = PyBytes_AsString(fb);
+  FILE *fs = fopen(f_as_uft, "r");
   Py_DECREF(fo);
   Py_DECREF(fb);
 #elif PY_VERSION_HEX >= 0x03000000
@@ -129,6 +129,7 @@ object BOOST_PYTHON_DECL exec_file(char const *filename, object global, object l
                 f,
                 Py_file_input,
 		global.ptr(), local.ptr());
+  fclose(fs);
   if (!result) throw_error_already_set();
   return object(detail::new_reference(result));
 }

src/object/enum.cpp

@@ -113,7 +113,6 @@ static PyTypeObject enum_type_object = {
 #if PY_VERSION_HEX < 0x03000000
     | Py_TPFLAGS_CHECKTYPES
 #endif
-    | Py_TPFLAGS_HAVE_GC
     | Py_TPFLAGS_BASETYPE,                  /* tp_flags */
     0,                                      /* tp_doc */
     0,                                      /* tp_traverse */