On Tue, May 23, 2023 at 9:07 AM Zoltán Turányi
<zoltan.tura...@ericsson.com> wrote:

> If we invoke make on the top makefile, it will compile the two lib{1,2}.o 
> object files serially.

That's because your rule is
subs:
                cd sub1
                make
              cd ../sub2
              make

Do something like

subs: sub1 sub2
sub1:; $(MAKE) -C sub1
sub2:; $(MAKE) -C sub2

regards, Dmitry

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