makefile for creating (.so) file from existing files

Question

I have 4 files: 1.c, 1.h, 2.c, 2.h. I need a makefile, which will create a dynamic library (.so) from tho

Answer 1

I'm no gnu make expert, this seems reasonable to me

CFLAGS+=-fPIC
%.so: ; $(LINK.c) $(LDFLAGS) -shared $^ -o $@

library.so: 1.o 2.o  # default target first

# changes to `1.h` imply `1.o` needs to be rebuilt
1.o: 1.h  
2.o: 2.h