Answer Posted / ataraxic

Using ar utility.
Let's say we have lib1.c lib2.c and myprog.c
We want to do a library from lib1.c && lib2.c, and compile
myprog.c with this library afterwards.
The steps are:
Compile
1. gcc -c lib1.c -o lib1.o
2. gcc -c lib2.c -o lib2.o

Create archive named libmy.a
3. ar -rcsv libmy.a lib1.o lib2.o

Compile myprog with newly created lib
4. gcc myprog.c -L. -lmy -o myprog

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