Added optional params to makefile

Makefile

@@ -1,16 +1,21 @@
+FLAGS := -Wall -pedantic
+LIBS :=
+
 ifeq ($(ARCH),win)
-GCC := i486-mingw32-gcc
-FLAGS := 
-OUTPUT := sudokuloeser.exe
+	GCC := i486-mingw32-gcc
+	OUTPUT := sudokuloeser.exe
 else
-GCC := gcc
-FLAGS := -lrt
-OUTPUT := sudokuloeser
+	GCC := gcc
+	LIBS +=-lrt
+	OUTPUT := sudokuloeser
 endif
 
+ifeq ($(BUILD),devel)
+	FLAGS += -ggdb
+endif
 
 sudokuloeser: input.o input_nstd.o main.o output.o output_nstd.o output_std.o solver.o solver_nstd.o solver_std.o html.o
-	${GCC} ${FLAGS} -o ${OUTPUT} input.o input_nstd.o main.o output.o output_nstd.o output_std.o solver.o solver_nstd.o solver_std.o html.o
+	${GCC} ${FLAGS} ${LIBS} -o ${OUTPUT} input.o input_nstd.o main.o output.o output_nstd.o output_std.o solver.o solver_nstd.o solver_std.o html.o
 
 install: sudokuloeser
 	install -vDm755 sudokuloeser /usr/bin/sudokuloeser
@@ -19,28 +24,44 @@ uninstall:
 	rm /usr/bin/sudokuloeser
 
 input.o: input.c input.h types.h
-	${GCC} -Wall -pedantic -c input.c
+	${GCC} ${FLAGS} -c input.c
 input_nstd.o: input_nstd.c input_nstd.h types.h
-	${GCC} -Wall -pedantic -c input_nstd.c
+	${GCC} ${FLAGS} -c input_nstd.c
 main.o: main.c main.h types.h input.h input_nstd.h solver.h solver_std.h solver_nstd.h output.h output_std.h output_nstd.h html.h
-	${GCC} -Wall -pedantic -c main.c
+	${GCC} ${FLAGS} -c main.c
 output.o: output.c output.h types.h
-	${GCC} -Wall -pedantic -c output.c
+	${GCC} ${FLAGS} -c output.c
 output_nstd.o: output_nstd.c output_nstd.h types.h
-	${GCC} -Wall -pedantic -c output_nstd.c
+	${GCC} ${FLAGS} -c output_nstd.c
 output_std.o: output_std.c output_std.h types.h
-	${GCC} -Wall -pedantic -c output_std.c
+	${GCC} ${FLAGS} -c output_std.c
 solver.o: solver.c solver.h types.h
-	${GCC} -Wall -pedantic -c solver.c
+	${GCC} ${FLAGS} -c solver.c
 solver_nstd.o: solver_nstd.c solver_nstd.h types.h
-	${GCC} -Wall -pedantic -c solver_nstd.c
+	${GCC} ${FLAGS} -c solver_nstd.c
 solver_std.o: solver_std.c solver_std.h types.h
-	${GCC} -Wall -pedantic -c solver_std.c
+	${GCC} ${FLAGS} -c solver_std.c
 html.o: html.c html.h types.h
-	${GCC} -Wall -pedantic -c html.c
+	${GCC} ${FLAGS} -c html.c
 
 clean:
 	rm -vf *.o
 
 clean_all:
-	rm -vf *.o sudokuloeser
+	rm -vf *.o sudokuloeser sudokuloeser.exe
+
+help:
+	@echo "make [target] [options]"
+	@echo 
+	@echo "Targets:"
+	@echo "  sudokuloeser  creates the executable (default)"
+	@echo "  install       installs the binary to /usr/bin/"
+	@echo "  uninstall     uninstalls the binary"
+	@echo "  clean         Remove objects"
+	@echo "  clean_all     Remove objects and executables"
+	@echo "  help          Print this help."
+	@echo "Options:"
+	@echo "  BUILD=devel   include debug symbols"
+	@echo "  "
+	@echo "  ARCH=win      Cross Compile for Windows"
+