Commented makefile

makefile

@@ -1,27 +1,46 @@
 #!/usr/bin/make -f
+
+# Target architecture for compilation
+ARCH = native
+
+# Optimization level
+O = 3
+
+# Flags for the compiler
 FLAGS  = -std=c23
-FLAGS += -O3
+FLAGS += -O$(O)
-FLAGS += -march=native
+FLAGS += -march=$(ARCH)
+# Only override gcc default tuning if specified in make command line
+ifneq (, $(TUNE))
+	FLAGS += -mtune=$(TUNE)
+endif
 FLAGS += -pedantic
 FLAGS += -Wall
 FLAGS += -Wextra
 FLAGS += -Werror
+# This flag is because of the compiler otherwise giving too much warning
 FLAGS += -Wformat-truncation=0
 
+# Compile flag for defining GITHASH to put at the end of the version string
 GITFLAG = -D'GITHASH=$(shell git rev-parse --short=1 HEAD)'
 
+# Directories where .o files and excecutables will be placed
 OBJDIR = obj
 OUTDIR = out
 
+# The UI to compile for by default using make run
 #UI_TARGET = vt100
 UI_TARGET = ncurses
 
+# The URL of the plaintext version of the lisence, for the --license option
 LICENSEURL = https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
 
+# C compiler
 CC = cc
 
 .NOTINTERMEDIATE:
 
+# Messages to print during different steps in making
 MSG_FETCHING = FETCHING:
 MSG_LINKING = Linking:
 MSG_COMPILING = Compiling C:
@@ -29,44 +48,57 @@ MSG_CLEANING = Cleaning:
 MSG_CLEANING_OBJ = Cleaning $(OBJDIR):
 MSG_CLEANING_OUT = Cleaning $(OUTDIR):
 
+# Compile for all UI targets
 all: $(addprefix $(OUTDIR)/connect4_,ncurses.elf vt100.elf)
 
+# Compile and run the default UI target
 run: $(OUTDIR)/connect4_$(UI_TARGET).elf
 	./$<
 
+# Compile and run with a specific UI target
 run_%: $(OUTDIR)/connect4_%.elf
 	./$<
 
+# Compile specifically the ncurses version
+# This one's special because it needs -lncursesw
 $(OUTDIR)/connect4_ncurses.elf: $(addprefix $(OBJDIR)/,ui_ncurses.o logic.o connect4.o LICENSE.o)
 	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
 	$(CC) $(FLAGS) -lncursesw -o $@ $^
 
+# Compile the final excecutable for a given UI target
 $(OUTDIR)/connect4_%.elf: $(addprefix $(OBJDIR)/,ui_%.o logic.o connect4.o LICENSE.o)
 	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
 	$(CC) $(FLAGS) -o $@ $^
 
+# Make an object file for the license so it does not all need to be in the code
 $(OBJDIR)/LICENSE.o: $(OBJDIR)/LICENSE
 	@echo $(MSG_LINKING) $@
 	@mkdir -p $(@D)
 	cd $(@D); ld -r -b binary -o $(@F) $(^F)
 
+# Compile the object file of the main code.
+# This one's special because it includes the git hash
 $(OBJDIR)/connect4.o: connect4.c
 	@echo $(MSG_COMPILING) $^
 	@mkdir -p $(@D)
 	$(CC) -c $(FLAGS) $(GITFLAG) -o $@ $^
 
+# Generic object file compile
 $(OBJDIR)/%.o: %.c
 	@echo $(MSG_COMPILING) $^
 	@mkdir -p $(@D)
 	$(CC) -c $(FLAGS) -o $@ $^
 
+# Download the license file in non-markdown form.
+# This is not cleaned as that would be too silly
 $(OBJDIR)/LICENSE:
 	@echo $(MSG_FETCHING) $@
 	curl $(LICENSEURL) \
 		| sed -n '/END OF TERMS AND CONDITIONS/q;p' > $(OBJDIR)/LICENSE
 
+# Remove all compilation output and intermediate files
 clean:
 	@echo $(MSG_CLEANING)
 	@echo $(MSG_CLEANING_OBJ)