tentative GH CI fixes

remove python env var post tych0#172 merge
ensure pytest runs even when installed as pytest

Makefile

@@ -13,6 +13,11 @@ GEN=$(CABAL) new-run --minimize-conflict-set -j$(NCPUS) exe:xcffibgen --
 VENV=xcffib_venv
 PYTHON=$(VENV)/bin/python3
 FLAKE=$(VENV)/bin/flake8
+PYTEST=pytest-3
+ifeq (, $(shell which $(PYTEST)))
+	PYTEST=pytest
+endif
+
 
 # you should have xcb-proto installed to run this
 xcffib: module/*.py xcffib.cabal $(shell find . -path ./test -prune -false -o -name \*.hs)
@@ -46,7 +51,7 @@ clean:
 	-rm -rf .pc cabal.project.local*
 
 valgrind: xcffib
-	valgrind --leak-check=full --show-leak-kinds=definite pytest-3 -v
+	valgrind --leak-check=full --show-leak-kinds=definite $(PYTEST) -v
 
 newtests:
 	$(GEN) --input ./test/generator/ --output ./test/generator/
@@ -62,12 +67,38 @@ htests:
 	$(CABAL) new-test -j$(NCPUS) --enable-tests
 
 $(VENV): requirements.txt
-	# the python in $PATH in CI is the python from the matrix, so it is the
-	# "right" python to start with
-	python3 -m venv $(VENV)
-	$(PYTHON) -m pip install -r requirements.txt
+		# the python in $PATH in CI is the python from the matrix, so it is the
+		# "right" python to start with
+		python -m venv $(VENV)
+		$(PYTHON) -m pip install -r requirements.txt
+
+check-abi:
+	# check abi precompiled mode
+	# make a temporary env to test install and ensure we cd somewhere
+	# we won't pick up the local source xcffib module
+	$(eval TMPLOC=$(shell mktemp -d))
+	python -m venv $(TMPLOC)
+	CC=/bin/false ${TMPLOC}/bin/python -m pip install -v .
+	${TMPLOC}/bin/python -m pip install pytest pytest-xdist
+	pushd ${TMPLOC} && \
+		${TMPLOC}/bin/python -c "import xcffib; assert xcffib.cffi_mode == 'abi_precompiled'" && \
+		popd
+	${TMPLOC}/bin/python -m pytest -v --durations=3 -n auto
+
+check-api:
+	# check abi precompiled mode
+	# make a temporary env to test install and ensure we cd somewhere
+	# we won't pick up the local source xcffib module
+	$(eval TMPLOC=$(shell mktemp -d))
+	python -m venv ${TMPLOC}
+	${TMPLOC}/bin/python -m pip install -v .
+	${TMPLOC}/bin/python -m pip install pytest pytest-xdist
+	pushd ${TMPLOC} && \
+		${TMPLOC}/bin/python -c "import xcffib; assert xcffib.cffi_mode == 'abi_precompiled'" && \
+		popd
+	${TMPLOC}/bin/python -m pytest -v --durations=3 -n auto \
 
-check: xcffib htests $(VENV) lint
+check: xcffib htests $(VENV) lint check-api check-abi
 	cabal check
 	$(PYTHON) -m compileall xcffib
 	$(PYTHON) -m pytest -v --durations=3 -n $(NCPUS)