ENH: more targetting cleaning of cythonized sources

Author: yarikoptic

debian/rules

@@ -20,8 +20,10 @@ EXCLUDE_MORETESTS :=
 	: # Explicit build system to avoid use of all-in-1 Makefile
 	dh $@ --buildsystem=python_distutils
 
-cythonize:
-	find pandas/src -iname *.c -delete
+clean_generated:
+	grep -l -e 'Generated by Cython' pandas/src/*.c | xargs -r rm -f
+
+cythonize: clean_generated
 	python setup.py cython
 	cp pandas/src/*.c debian/cythonized-files
 	echo "$(UVER)" >| debian/cythonized-files/VERSION
@@ -32,11 +34,10 @@ override_dh_auto_configure:
 		cp -rp debian/cythonized-files/*.c pandas/src/; } || :
 	dh_auto_configure
 
-override_dh_clean:
+override_dh_clean: clean_generated
 	: # Make sure that cythonized sources are up-to-date
 	[ "$(UVER)" = "`cat debian/cythonized-files/VERSION`" ]
 	rm -rf build doc/_build *-stamp # pandas.egg-info pandas/datasets/__config__.py
-	grep -l -e 'Generated by Cython' pandas/src/*.c | xargs -r rm -f
 	dh_clean
 	: # prune auto-generated version.py -- will be generated during build again
 	rm -f pandas/version.py