all: check

foo.c:
	echo 'main() {};' > foo.c

bar.c:
	echo 'bar() { return 0; }' > bar.c

libbar.a: bar.o
	ar cru libbar.a bar.o
	ranlib libbar.a

libbar-script.a:
	echo 'EXTERN(bar);' > libbar-script.a

foo1: foo.o libbar.a
	gcc -static -o foo1 foo.o -u bar libbar.a

foo2: foo.o libbar-script.a
	gcc -static -o foo2 foo.o libbar-script.a libbar.a

check: foo1 foo2
	objdump --syms foo1 | grep bar && echo BAR defined in foo1 || echo BAR undefined in foo1
	objdump --syms foo2 | grep bar && echo BAR defined in foo2 || echo BAR undefined in foo2

clean:
	rm -f foo.c bar.c foo.o bar.o libbar.a libbar-script.a foo1 foo2