A basic Makefile question

[Suzanne Baker]

Hi,

I have read through the GNU Make website on the internet, but I am
still unsure of how to create the Makefile for multiple .c files(150
..c files to be exact)

The following is my Makefile for a 3 .c files and one .h file into one
single .exe file:
CFLAGS=

TGT=tt

OBJ=file1.o file2.o file3.o

$(TGT): $(OBJ)
cc $(CFLAGS) $(OBJ) -o $(TGT);

file1.o: file1.c testheader.h
cc -c file1.c;

file2.o: file2.c
cc -c file2.c;

file3.o: file3.c testheader.h
cc -c file3.c;

clean:
rm -f *.o;

The above Makefile is for 3 .c files only. If I want to compile a
total of 150 different .c files, what should I do? Do I really have to
type out the following part for every single .c file?

file1.o: file1.c testheader.h
cc -c file1.c;

I would greatly appreciate it if anyone can tell me a shorter and more
efficient method of compiling and linking all the 150 .c files into
one single .exe file.
Thanks alot in advance for your kind help.

Regards,
Suzanne

[Eric]

On 1 Jul 2003 01:16:02 -0700, [email]suz__1@hotmail.com[/email] (Suzanne Baker)
wrote:

>I would greatly appreciate it if anyone can tell me a shorter and more
>efficient method of compiling and linking all the 150 .c files into
>one single .exe file.

Hi Suzanne,

The following is a makefile that you might find useful. It has
overhead in that it computes the dependencies at build time using a
few smart tricks. All you have to do is replace the name of the
executable, flags, and libs on the first 3 lines. Place the makefile
in the same directory as your source code and you should be in
business.

I got this makefile from a friend a while back so I'm not sure where
it is from. It was originally for .cpp files but I have replaced
g++/.cpp with gcc/.c in the makefile below (hope it still works!).

Hope it helps,
Eric.

---
EXECUTABLE = program
CPPFLAGS = -ggdb3 -Wall
LIBS = -lpthread
#################################################
CC = gcc
SRCS := $(wildcard *.c)
OBJS := $(patsubst %.c,%.o,$(SRCS))
DEPS := $(patsubst %.c,%.d,$(SRCS))
#################################################
all: $(EXECUTABLE)

$(EXECUTABLE): $(DEPS) $(OBJS)
$(CC) -o $(EXECUTABLE) $(OBJS) $(LIBS)

%.d: %.cpp
$(CC) -MM $(CPPFLAGS) $< > $@
$(CC) -MM $(CPPFLAGS) $< | sed s/\\.o/.d/ >> $@

%.d: %.h
$(CC) -MM $(CPPFLAGS) $< > $@
$(CC) -MM $(CPPFLAGS) $< | sed s/\\.o/.d/ >> $@
clean:
-rm $(OBJS) $(EXECUTABLE) $(DEPS) *~

explain:
@echo "--------Some Info--------"
@echo "Executable name: $(EXECUTABLE)"
@echo "Source files: $(SRCS)"
@echo "Object files: $(OBJS)"
@echo "Dependency files: $(DEPS)"

depends: $(DEPS)
@echo "Dependencies updated"

-include $(DEPS)

run: all
./$(EXECUTABLE)

debug: all
gdb $(EXECUTABLE)

clean-emacs:
rm *~
---