CODEWITHSUNDEEP
cgccmakefile
toastedDeli
toastedDeli

Reputation: 580

How to make a single "makefile" create 3 output binaries

could anyone help me create a makefile for my project? I need 3 binaries to be created from the makefile.

The binaries compile individually like this:

gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread main.c service_client_socket.c service_listen_socket.c get_listen_socket.c -o serverThreaded

gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread main.c service_client_socket.c service_listen_socket.c get_listen_socket.c -o server

(So it creates 2 identical binaries but with different names, serverThreaded and server)

and also I need this from the makefile too:

gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread client.c -o client

Edit: I think this is what I need?

all: serverThreaded server client

    gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread main.c service_client_socket.c service_listen_socket.c get_listen_socket.c -o serverThreaded 
    gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread main.c service_client_socket.c service_listen_socket.c get_listen_socket.c -o server 
    gcc -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread client.c -o client 
    .PHONY: all

Upvotes: 0

Views: 1437

Answers (2)

user2371524
user2371524

Reputation:

You can add a phony rule (that is a rule that doesn't build a file itself) which has whatever you want to build as its prerequisites. By convention, this rule is called all in most Makefiles. For your case, it would look like this:

all: serverThreaded server client

It's also common to put this as the very first rule, so if you just type make without a target, it is automatically selected.

An important thing to do is to let make know this rule actually is "phony" by putting it in the prerequisites of the special target .PHONY like this:

.PHONY: all

This is necessary because otherwise, make would expect it to build a file called all. If you'd ever have a file all in your current directory which is newer than all files you actually build, make wouldn't do anything.

Regarding the edit, it doesn't make any sense. Explaining make entirely isn't possible in this Q&A format, so I'll just give you an example how a very basic Makefile could look like, as a start:

CC:= gcc
CFLAGS:= -D_POSIX_SOURCE -Wall -Werror -pedantic -std=c99 -D_GNU_SOURCE -pthread
LIBS:= -pthread

serverThreaded_OBJS:= main.o service_client_socket.o service_listen_socket.o get_listen_socket.o
server_OBJS:= main.o service_client_socket.o service_listen_socket.o get_listen_socket.o
client_OBJS:= client.o

all: serverThreaded server client

serverThreaded: $(serverThreaded_OBJS)
    $(CC) -o$@ $^ $(LIBS)

server: $(server_OBJS)
    $(CC) -o$@ $^ $(LIBS)

client: $(client_OBJS)
    $(CC) -o$@ $^ $(LIBS)

%.o: %.c
    $(CC) -c $(CFLAGS) -o$@ $<

clean:
    rm -f *.o

.PHONY: all clean

As a side note, it's strange how your serverThreaded and server are built from the exact same sources with the exact same flags -- you will end up with the exact same binaries.

Upvotes: 5

Florian Weimer
Florian Weimer

Reputation: 33747

You can add an artificial target as the first one. By convention, this target is usually called all. Then you can list all the dependencies you actually want to build:

all: serverThreaded server client

See this discussion of the default goal.

Upvotes: 1

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