add macros to enable dependency generator

References: https://fedoraproject.org/wiki/Changes/EnablingPythonGenerators
Signed-off-by: Igor Gnatenko <ignatenkobrain@fedoraproject.org>
(cherry picked from commit ec476c84cc)

macros.python

@@ -71,3 +71,7 @@
     print(" not recognized.")
   end
 }
+
+%python_enable_dependency_generator() \
+%global __python_requires %{_rpmconfigdir}/pythondistdeps.py --requires \
+%{nil}

macros.python3

@@ -1,5 +1,4 @@
-%__python3 /usr/libexec/system-python
-%__python3_bin /usr/bin/python3
+%__python3 /usr/bin/python3
 %python3_sitelib %(%{__python3} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
 %python3_sitearch %(%{__python3} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1))")
 %python3_version %(%{__python3} -c "import sys; sys.stdout.write(sys.version[:3])")
@@ -11,7 +10,7 @@
 # Use the slashes after expand so that the command starts on the same line as
 # the macro
 %py3_build() %{expand:\\\
-  CFLAGS="%{optflags}" %{__python3} %{py_setup} %{?py_setup_args} build --executable="%{__python3_bin} %{py3_shbang_opts}" %{?*}
+  CFLAGS="%{optflags}" %{__python3} %{py_setup} %{?py_setup_args} build --executable="%{__python3} %{py3_shbang_opts}" %{?*}
   sleep 1
 }
 
@@ -26,7 +25,7 @@
 }
 
 %py3_install() %{expand:\\\
-  CFLAGS="%{optflags}" %{__python3} %{py_setup} %{?py_setup_args} install -O1 --skip-build --root %{buildroot} --executable="%{__python3_bin} %{py3_shbang_opts}" %{?*}
+  CFLAGS="%{optflags}" %{__python3} %{py_setup} %{?py_setup_args} install -O1 --skip-build --root %{buildroot} %{?*}
 }
 
 %py3_install_egg() %{expand:\\\
@@ -35,5 +34,5 @@
 }
 
 %py3_install_wheel() %{expand:\\\
-  pip%{python3_version} install -I dist/%{1} --root %{buildroot} --strip-file-prefix %{buildroot} --prefix %{_prefix} --no-deps
+  pip%{python3_version} install -I dist/%{1} --root %{buildroot} --strip-file-prefix %{buildroot} --no-deps
 }

python-rpm-macros.spec

@@ -1,6 +1,6 @@
 Name:           python-rpm-macros
 Version:        3
-Release:        19%{?dist}
+Release:        21%{?dist}
 Summary:        The unversioned Python RPM macros
 
 License:        MIT
@@ -69,6 +69,14 @@ install -m 644 %{SOURCE0} %{SOURCE1} %{SOURCE2} %{SOURCE3} \
 
 
 %changelog
+* Fri Jan 19 2018 Igor Gnatenko <ignatenkobrain@fedoraproject.org> - 3-25
+- Add %%python_enable_dependency_generator
+
+* Fri Mar 03 2017 Michal Cyprian <mcyprian@redhat.com> - 3-20
+- Revert "Switch %%__python3 to /usr/libexec/system-python"
+  after the Fedora Change https://fedoraproject.org/wiki/Changes/Making_sudo_pip_safe
+  was postponed
+
 * Fri Feb 17 2017 Michal Cyprian <mcyprian@redhat.com> - 3-19
 - Switch %%__python3 to /usr/libexec/system-python