Makefile not including libraries

Question

I'm trying to compile something and include the pthread library in my makefile, but it doesn't seem to put it on the command line. If i type it directily into the command line it compiles, but if I try to use my makefile it comes up with errors along the lines of undefined refernce to pthread_join and such.

Here is my makefile

CC=gcc


all: pthreads 

pthreads: pthreads.c 
    gcc -o pthreads pthreads.c -lpthread 

Answer 1

You are missing the s on the target line (ie you have pthread: ). So your rule isn't being run. The default (built-in) make rule is (and that rule doesn't have the -lpthread bit).

You can either fix your typo or put -lpthread in LDLIBS and let the built-in rule do the compilation and linking for you.