1. Visual Stupid Version


$ pwd
/home/jhl/tmp/c/myapp/src
$ ls .. ../include/ ../src/
..:
include src

../include/:
bar.h foo.h

../src/:
bar.c foo.c main.c Makefile
$
$ cat Makefile
 
# Visual Stupid Makefile 1628872598@qq.com
# Layout: [include/]  src/
# .c and Makefile in src, .h can be in include, no other directories.
# Project related: CPPFLAGS
# .cpp, CXX, CXXFLAGS for C++
 
OUT      = main.out
SRCS     = $(wildcard *.c)
OBJS     = $(patsubst %.c,%.o,$(SRCS))
CC       = gcc
CXX      = g++
CFLAGS   = -std=c99 -Wall -W
CXXFLAGS = -std=c++0x -Wall -W
CPPFLAGS = -I ../include
LDFLAGS  =
 
CFLAGS   += -g
#CFLAGS  += -DNDEBUG
CFLAGS   += -D_POSIX_SOURCE -D_BSD_SOURCE
#LDFLAGS += -lpthread
 
$(OUT): $(OBJS)
        $(CC) $(LDFLAGS) $^ -o $@
 
include $(SRCS:.c=.d)
 
%.d: %.c
        @set -e; rm -f $@; \
        $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \
        sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
        rm -f $@.$$$$
 
.PHONY: clean
clean:
        rm *.d *.d.* $(OBJS) $(OUT)
 
$

$ make
Makefile:20: bar.d: No such file or directory
Makefile:20: foo.d: No such file or directory
Makefile:20: main.d: No such file or directory
gcc -ansi -pedantic -Wall -W -I ../include -c -o bar.o bar.c
gcc -ansi -pedantic -Wall -W -I ../include -c -o foo.o foo.c
gcc -ansi -pedantic -Wall -W -I ../include -c -o main.o main.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ touch ../include/foo.h
$ make
gcc -ansi -pedantic -Wall -W -I ../include -c -o foo.o foo.c
gcc -ansi -pedantic -Wall -W -I ../include -c -o main.o main.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ touch ../include/bar.h
$ make
gcc -ansi -pedantic -Wall -W -I ../include -c -o bar.o bar.c
gcc -ansi -pedantic -Wall -W -I ../include -c -o main.o main.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ touch main.c
$ make
gcc -ansi -pedantic -Wall -W -I ../include -c -o main.o main.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ touch foo.c
$ make
gcc -ansi -pedantic -Wall -W -I ../include -c -o foo.o foo.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ touch bar.c
$ make
gcc -ansi -pedantic -Wall -W -I ../include -c -o bar.o bar.c
gcc bar.o foo.o main.o -o main.out
$ make
make: `main.out' is up to date.
$ ./main.out
main.c:7:main
foo.c:6:foo
bar.c:6:bar
$ ls .. ../include/ ../src/
..:
include src

../include/:
bar.h foo.h

../src/:
bar.c bar.o foo.d main.c main.o Makefile
bar.d foo.c foo.o main.d main.out
$


================================================================================


2. More powerful version


$ pwd
/home/jhl/tmp/c/myapp
$ ls . bar/ include/ src/
.:
bar include main.c Makefile src

bar/:
bar.c bar.h

include/:
foo.h

src/:
foo.c
$
$ cat Makefile
# Visual Stupid Makefile 1628872598@qq.com
# Layout: include/ src/ Makefile [main.c] bar/
# .h and .c can be in include and src, or other sub-directories bar
# main.c can be in the top level directory with Makefile or other directories
# Project related: SRCS, CPPFLAGS, vpath
 
OUT = main.out
# .cpp for C++
SRCS = main.c \
  foo.c \
  bar.c
OBJS = $(patsubst %.c,%.o,$(SRCS))
 
CC = gcc
CXX = g++
CFLAGS = -ansi -pedantic -Wall -W
CXXFLAGS = -ansi -pedantic -Wall -W
CPPFLAGS = -I include -I bar
LDFLAGS =
 
vpath %.c src bar
 
$(OUT): $(OBJS)
  $(CC) $(LDFLAGS) $^ -o $@
 
include $(SRCS:.c=.d)
 
# .cpp, CXX for C++
%.d: %.c
  @set -e; rm -f $@; \
  $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \
  sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
  rm -f $@.$$$$
 
.PHONY: clean
clean:
  rm *.d $(OBJS) $(OUT)

$
$ make
Makefile:26: main.d: No such file or directory
Makefile:26: foo.d: No such file or directory
Makefile:26: bar.d: No such file or directory
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o main.o bar/main.c
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o foo.o src/foo.c
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o bar.o bar/bar.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ touch include/foo.h
$ make
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o main.o bar/main.c
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o foo.o src/foo.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ touch bar/bar.h
$ make
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o main.o bar/main.c
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o bar.o bar/bar.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ touch main.c
$ make
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o main.o main.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ touch src/foo.c
$ make
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o foo.o src/foo.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ touch bar/bar.c
$ make
gcc -ansi -pedantic -Wall -W -I include -I bar -c -o bar.o bar/bar.c
gcc main.o foo.o bar.o -o main.out
$ make
make: `main.out' is up to date.
$ ./main.out
main.c:7:main
src/foo.c:6:foo
bar/bar.c:6:bar
$ ls . bar/ include/ src/
.:
bar bar.o foo.o main.c main.o Makefile
bar.d foo.d include main.d main.out src

bar/:
bar.c bar.h

include/:
foo.h

src/:
foo.c
$


================================================================================


3. Old version


# Filename : Makefile
# Author : jhlicc@gmai1.c0m
# Despcrition : An Implicit Rule Makefile
# Reference : GNU `make':
# 2.5 Letting make Deduce the Commands, 2.6 Another Style of Makefile
 
# Source file organization:
#
# Source file organization:
#
#         +--------+-------+
#   +-----+----+---+---+---+---+
#   |     |    |  a.h  |  b.h  | ...
#   |  main.c  +-------+-------+
#   |          |  a.c  |  b.c  | ...
#   +----------+-------+-------+

 
CC = gcc
CFLAGS = -ansi -pedantic -Wall -W
LDFLAGS =
OBJ = main.o a.o b.o
OUT = main.out
 
$(OUT) : $(OBJ)
  $(CC) $(LDFLAGS) $^ -o $@
 
main.o a.o : a.h
main.o b.o : b.h
 
.PHONY : clean
clean :
  rm $(OUT) $(OBJ)