Tweak test build to run faster, and adapt CI

.gitlab-ci.yml

@@ -3,17 +3,6 @@
 # see https://hub.docker.com/_/gcc/
 image: gcc
 
-build:
-  stage: build
-  before_script: 
-    - apt update && apt -y install make
-  script: 
-    - make -C tests
-  cache:
-    paths:
-      - "tests/*.o"
-      - "tests/test-*"
-
 test:
   stage: test
   script:

tests/Makefile

@@ -14,10 +14,10 @@ check: all
 	@echo "Success."
 
 jit.o: ../jit.h ../jit/*.c
-	$(CC) $(CFLAGS) $(CPPFLAGS) -flto -I.. -o jit.o -c ../jit/jit.c
+	$(CC) $(CFLAGS) $(CPPFLAGS) -I.. -o jit.o -c ../jit/jit.c
 
 test-%: %.c jit.o test.h
-	$(CC) $(CFLAGS) $(CPPFLAGS) -flto -I.. -o $@ jit.o $<
+	$(CC) $(CFLAGS) $(CPPFLAGS) -I.. -o $@ jit.o $<
 
 clean:
 	rm -f $(addprefix test-,$(TESTS))