build: Add "help" target to Makefile.in

Makefile.in

@@ -401,7 +401,7 @@ ifdef TRAVIS
 SHOW_DIFF_OUTPUT=--show-diff-output
 endif
 
-.PHONY: check units fuzz noise tmain tinst clean-units clean-tmain clean-gcov run-gcov codecheck
+.PHONY: check units fuzz noise tmain tinst clean-units clean-tmain clean-gcov run-gcov codecheck help
 check: tmain units
 
 #
@@ -512,4 +512,27 @@ clean-gcov:
 	$(SILENT) rm -f $(SOURCES:.c=.gcda)
 	$(SILENT) rm -f $(srcdir)/*.gcov
 
+#
+# Help
+#
+help:
+	@echo "Compilation targets:"
+	@echo ""
+	@echo "make                              - Build $(CTAGS_PROG)"
+	@echo "make V=1                          - Build $(CTAGS_PROG) - verbose output"
+	@echo "make -f mk_mingw.mak              - Build $(CTAGS_PROG) using MinGW"
+	@echo "make -f mk_mingw.mak V=1          - Build $(CTAGS_PROG) using MinGW - verbose output"
+	@echo ""
+	@echo "Testing targets:"
+	@echo ""
+	@echo "make units                        - Run parser unit test cases"
+	@echo "make tmain                        - Run ctags main functionality test cases"
+	@echo "make fuzz                         - Verify that all parsers are able to properly process each available test unit"
+	@echo "make noise                        - TODO"
+	@echo
+	@echo "Arguments that can be used in testing targets:"
+	@echo "VG=1                              - Run test cases with Valgrind memory profiler"
+	@echo "LANGUAGES=<language>[,<language>] - Only run test cases of the selected languages"
+	@echo "CATEGORIES=<category>             - Only run tests available under folder Units/<category>.r"
+
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