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Automated GNU Makefile

05.02.2007
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        A simple automated GNU Makefile to build and link c/c++/asm projects. All the variables that need to be tweaked are located at the begining:
    PROGNAME: the name of the executable to be built
    CC: the C compiler
    CPP: the C++ compiler
    ASM: the assambler
    LD: the linker

This searches for all *.c, *.cpp and *.s files and compiles them into objects. It then links all the files into a single executable.

The strip rule is used to strip all unwanted symbols from the resulting executable. This usually results in a significant (think 40%) size optimisation.

$(VERBOSE).SILENT:

PROGNAME = prog

CC = gcc
CC += -c
CPP = g++
CPP += -c
ASM = nasm
ASM += -f elf -d ELF_TYPE
LD = g++

OBJFILES = $(patsubst %.c,%.o,$(wildcard *.c))
OBJFILES += $(patsubst %.s,%.o,$(wildcard *.s))
OBJFILES += $(patsubst %.cpp,%.o,$(wildcard *.cpp))

all: $(PROGNAME)

clean:
	@echo "Cleaning object files"
	@echo "    rm -f     *.o"
	rm -f *.o
	@echo "Cleaning backups"
	@echo "    rm -f     *~"
	rm -f *~
	@echo "Removing programme"
	@echo "    rm -f     "$(PROGNAME)
	rm -f $(PROGNAME)

%.o: %.s
	@echo "Assambling "$@
	@echo "    ASM       "$<
	$(ASM) $<

%.o: %.c
	@echo "Compiling "$@
	@echo "    CC        "$<
	$(CC) $<

%.o: %.cpp
	@echo "Compiling "$@
	@echo "    CPP       "$<
	$(CPP) $<

$(PROGNAME): $(OBJFILES)
	@echo "Linking "$@
	@echo "    LD        -o "$(PROGNAME)"        "$(OBJFILES)
	$(LD) -o $(PROGNAME) $(OBJFILES)

strip: $(PROGNAME)
	@echo "Stripping "$(PROGNAME)
	echo -n "Size of "$(PROGNAME)" before strip is "
	ls -sh $(PROGNAME) | cut -d' ' -f1
	@echo "    strip     "$(PROGNAME)
	strip $(PROGNAME)
	echo -n "Size of "$(PROGNAME)" after strip is "
	ls -sh $(PROGNAME) | cut -d' ' -f1

nothing:
	@echo "Nothing to do; quitting  :("
	@echo "HINT: Try make all"