Better handling of valgrind in Makefile

.gitignore

@@ -4,3 +4,4 @@
 /emacspy.h
 .mypy_cache
 *.pyc
+/.valgrind-python.supp

Makefile

@@ -48,16 +48,23 @@ test_ert: all
  ${EMACS} -batch -l tests/prepare-tests.el -l ert -l tests/test.el \
  -f ert-run-tests-batch-and-exit
 
+# https://stackoverflow.com/questions/20112989/how-to-use-valgrind-with-python
+test_valgrind: OPTIMALISATION_FLAGS=
+test_valgrind: clean all .valgrind-python.supp
+ PYTHONMALLOC=malloc valgrind --tool=memcheck --suppressions=.valgrind-python.supp \
+ --leak-check=full --show-leak-kinds=all \
+ ${EMACS} -batch -l tests/prepare-tests.el -l ert -l tests/test.el \
+ -f ert-run-tests-batch-and-exit
+
+.valgrind-python.supp:
+ wget -O .valgrind-python.supp \
+ "https://raw.githubusercontent.com/python/cpython/main/Misc/valgrind-python.supp"
+ echo "WARNING: Read instructions from top of .valgrind-python.supp"
+ false
+
 test_formatting:
  ${CLANGFORMAT} --dry-run --Werror stub.c subinterpreter.c
 
 test_module_assertions: emacspy.so
  ${EMACS} --batch --module-assertions --eval \
  '(progn (add-to-list '\''load-path ".") (load "emacspy"))'
-
-# https://stackoverflow.com/questions/20112989/how-to-use-valgrind-with-python
-test_valgrind: OPTIMALISATION_FLAGS=
-test_valgrind: clean all
- valgrind --tool=memcheck --leak-check=full \
- ${EMACS} -batch -l tests/prepare-tests.el -l ert -l tests/test.el \
- -f ert-run-tests-batch-and-exit