creating more than one in single makefile in c?

Shahid nx · 10-13-2012, 06:09 AM

Hi all,
what is way to create two executable from two programs in a single make file. i.e i have programs abc.c and xyz.c and i m creating the makefile like this
xyz:xyz.o
gcc xyz.o -o xyz
abc:abc.o
gcc abc.o -o abc
abc.o:abc.c
gcc abc.c -c
xyz.o:xyz.c
gcc xyz.c -c
But when i execute make command it is only creating the xyz executable not creating abc.!! Can anyone please explain me why this is happening? and also solution for this.

Regards,
shahid nx

Snark1994 · 10-13-2012, 08:37 AM

Essentially the problem with yours is that when you type 'make' it will run the first rule, which is

Code:

gcc xyz.o -o xyz

What you need instead is

Code:

all: xyz.o abc.o
  gcc xyz.o abc.o -o executable

However, you could also do is:

Code:

OBJECTS = abc.o xyz.o

all: $(OBJECTS)
    gcc $(OBJECTS) -o executable

%.o: %.c
    gcc -c $<

So the bottom bit is a rule to change a .c file to a .o file, the middle bit says that to make the executable you need objects 'abc.o' and 'xyz.o' and how to combine them to make the executable using gcc, and the first line lists all the objects you need.

Hope this helps,