Interesting, I didn't know make would default to using the C compiler given rules regarding source files.
Anyway, a simple solution that demonstrates simple Makefile concepts would be:
HEADERS = program.h headers.h
default: program
program.o: program.c $(HEADERS)
gcc -c program.c -o program.o
program: program.o
gcc program.o -o program
clean:
-rm -f program.o
-rm -f program
(bear in mind that make requires tab instead of space indentation, so be sure to fix that when copying)
However, to support more C files, you'd have to make new rules for each of them. Thus, to improve:
HEADERS = program.h headers.h
OBJECTS = program.o
default: program
%.o: %.c $(HEADERS)
gcc -c $< -o $@
program: $(OBJECTS)
gcc $(OBJECTS) -o $@
clean:
-rm -f $(OBJECTS)
-rm -f program
I tried to make this as simple as possible by omitting variables like $(CC) and $(CFLAGS) that are usually seen in makefiles. If you're interested in figuring that out, I hope I've given you a good start on that.
Here's the Makefile I like to use for C source. Feel free to use it:
TARGET = prog
LIBS = -lm
CC = gcc
CFLAGS = -g -Wall
.PHONY: default all clean
default: $(TARGET)
all: default
OBJECTS = $(patsubst %.c, %.o, $(wildcard *.c))
HEADERS = $(wildcard *.h)
%.o: %.c $(HEADERS)
$(CC) $(CFLAGS) -c $< -o $@
.PRECIOUS: $(TARGET) $(OBJECTS)
$(TARGET): $(OBJECTS)
$(CC) $(OBJECTS) -Wall $(LIBS) -o $@
clean:
-rm -f *.o
-rm -f $(TARGET)
It uses the wildcard and patsubst features of the make utility to automatically include .c and .h files in the current directory, meaning when you add new code files to your directory, you won't have to update the Makefile. However, if you want to change the name of the generated executable, libraries, or compiler flags, you can just modify the variables.
In either case, don't use autoconf, please. I'm begging you! :)
For example this simple Makefile should be sufficient:
CC=gcc CFLAGS=-Wall all: program program: program.o program.o: program.c program.h headers.h clean: rm -f program program.o run: program ./program
Note there must be <tab>
on the next line after clean and run, not spaces.
UPDATE Comments below applied
all: program
program.o: program.h headers.h
is enough. the rest is implicit
The simplest make file can be
all : test
test : test.o
gcc -o test test.o
test.o : test.c
gcc -c test.c
clean :
rm test *.o
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