netdev - Re: [PATCH iproute2] build: Fix link errors on some systems

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Date:   Wed, 6 Jan 2021 08:00:20 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Roi Dayan <roid@...dia.com>
Cc:     Petr Machata <petrm@...dia.com>, <netdev@...r.kernel.org>,
        David Ahern <dsahern@...il.com>, Petr Machata <me@...chata.org>
Subject: Re: [PATCH iproute2] build: Fix link errors on some systems

On Wed, 6 Jan 2021 10:42:35 +0200
Roi Dayan <roid@...dia.com> wrote:

> > 
> > I think that just adding an unnecessary -lm is more of a tidiness issue
> > than anything else. One way to avoid it is to split the -lm deps out
> > from util.c / json_print.c to like util_math.c / json_print_math.c. That
> > way they will be in an .o of their own, and won't be linked in unless
> > the binary in question needs the code. Then the binaries that do call it
> > can keep on linking in -lm like they did so far.
> > 
> > Thoughts?
> >   

Adding -lm to just some tools is not really required.
The linker will ignore the shared library if not used.