Make minor improvements to Makefiles (cucumber#393)

* [Makefile] refactor with the builtin variable MAKE

as stated in https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html

    Recursive make commands should always use the variable MAKE,
    not the explicit command name ‘make’

* [Makefile] refactor without cd

the use of the option -C (--directory=) is idiomatic

* [c/Makefile] refactor without cd

the use of the option -C (--directory=) is idiomatic

Author: fperrad

Makefile

@@ -9,40 +9,40 @@ acceptance: $(patsubst %,acceptance-%,$(languages)) ## Build acceptance test dir
 .PHONY: acceptance
 
 acceptance-%: %
-	cd $< && make acceptance
+	$(MAKE) --directory=$< acceptance
 .PHONY: acceptance-%
 
 clean: $(patsubst %,clean-%,$(languages)) ## Remove all build artifacts and files generated by the acceptance tests for all supported languages
 .PHONY: clean
 
 clean-%: %
-	cd $< && make clean
+	$(MAKE) --directory=$< clean
 .PHONY: clean-%
 
 generate: $(patsubst %,generate-%,$(languages)) ## Generate parsers for all supported languages
 .PHONY: generate
 
 generate-%: %
-	cd $< && make generate
+	$(MAKE) --directory=$< generate
 .PHONY: generate-%
 
 clean-generate: $(patsubst %,clean-generate-%,$(languages)) ## Clean generated parsers for all supported languages
 .PHONY: clean-generate
 
 clean-generate-%: %
-	cd $< && make clean-generate
+	$(MAKE) --directory=$< clean-generate
 .PHONY: clean-generate-%
 
 copy-gherkin-languages: $(patsubst %,copy-gherkin-languages-%,$(languages)) ## Copy gherkin-languages.json to all supported languages
 .PHONY: copy-gherkin-languages
 
 copy-gherkin-languages-%: %
-	cd $< && make copy-gherkin-languages
+	$(MAKE) --directory=$< copy-gherkin-languages
 .PHONY: generate-%
 
 clean-gherkin-languages: $(patsubst %,clean-gherkin-languages-%,$(languages)) ## Clean gherkin-languages.json
 .PHONY: clean-gherkin-languages
 
 clean-gherkin-languages-%: %
-	cd $< && make clean-gherkin-languages
+	$(MAKE) --directory=$< clean-gherkin-languages
 .PHONY: clean-gherkin-languages-%

c/Makefile

@@ -47,24 +47,24 @@ clean-gherkin-languages: ## Remove gherkin-languages.json and any derived files
 
 .built: generate $(SRC_FILES) src/Makefile
 	$(CC) --version
-	cd src; $(MAKE)
+	$(MAKE) --directory=src
 	touch $@
 
 clean:
 	rm -rf .compared .built .run acceptance
-	cd src; $(MAKE) $@
+	$(MAKE) --directory=src $@
 .PHONY: clean
 
 cli: ./include/rule_type.h src/parser.c src/dialect.c $(SRC_FILES) src/Makefile
-	cd src; $(MAKE) CC=$(CC) $@
+	$(MAKE) --directory=src CC=$(CC) $@
 .PHONY: libs
 
 libs: ./include/rule_type.h src/parser.c src/dialect.c $(SRC_FILES) src/Makefile
-	cd src; $(MAKE) CC=$(CC) $@
+	$(MAKE) --directory=src CC=$(CC) $@
 .PHONY: libs
 
 libs_so: ./include/rule_type.h src/parser.c src/dialect.c $(SRC_FILES) src/Makefile
-	cd src; $(MAKE) CC=$(CC) $@
+	$(MAKE) --directory=src CC=$(CC) $@
 .PHONY: libs_so
 
 .run: cli $(GHERKIN) $(GOOD_FEATURE_FILES)