I am trying to understand static and shared Libraries.
I want to do the following to create a makefile that does separate compilation and linking such that a static library is created and linked in forming the final static executable.
I have the following code for the Makefile, but I am getting the following error
Makefile:13: *** missing separator. Stop.
But I am also trying to understand how to actually link/create libraries.
If I run the commands after line 12 in the terminal they work, but not in the makefile.
myProgram: main.o addSorted.o freeLinks.o
gcc -lm -o myProgram main.o addSorted.o freeLinks.o
main.o: main.c
gcc -O -c -lm main.c main.h
addSorted.o: addSorted.c addSorted.h
gcc -O -c -lm addSorted.c
freeLinks.o: freeLinks.c freeLinks.h
gcc -O -c -lm freeLinks.c
ar rc libmylib.a main.o addSorted.o freeLinks.o //Error Line
ranlib libmylib.a
gcc -o foo -L. -lmylib foo.o
clean:
rm -f myProgram main.o addSorted.o freeLinks.o
Also, if you can assist in improving the code, I would really appreciate it.
Try this:
all: myProgram
myProgram: main.o libmylib.a #libmylib.a is the dependency for the executable
gcc -lm -o myProgram main.o -L. -lmylib
main.o: main.c
gcc -O -c main.c main.h
addSorted.o: addSorted.c addSorted.h
gcc -O -c addSorted.c
freeLinks.o: freeLinks.c freeLinks.h
gcc -O -c freeLinks.c
libmylib.a: addSorted.o freeLinks.o #let's link library files into a static library
ar rcs libmylib.a addSorted.o freeLinks.o
libs: libmylib.a
clean:
rm -f myProgram *.o *.a *.gch #This way is cleaner than your clean
This set of rules first compiles all files, then it makes library (libmylib.a) target and uses it's artifact to link the executable. I also added separate redundant target form making libs only. Needed files:
user@host> ls
addSorted.c addSorted.h freeLinks.c freeLinks.h main.c main.h Makefile
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