netdev - Re: Crosscompiling iproute2

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Message-ID: <20210516141745.009403b7@hermes.local>
Date:   Sun, 16 May 2021 14:17:45 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     netdev@...r.kernel.org
Subject: Re: Crosscompiling iproute2

On Sun, 16 May 2021 16:51:59 +0200
Frank Wunderlich <frank-w@...lic-files.de> wrote:

> Hi,
> 
> i want to crosscompile (a modified version of) iproute2 (git://git.kernel.org/pub/scm/network/iproute2/iproute2.git) for armhf
> 
> do you any idea how?
> configure-script seems to ignore "--host=arm-linux-gnueabihf" like i'm using for nftables
> 
> i modified Makefile
> 
> -CC := gcc
> +CC := arm-linux-gnueabihf-gcc
> 
> -SUBDIRS=lib ip tc bridge misc netem genl tipc devlink rdma dcb man vdpa
> +#SUBDIRS=lib ip tc bridge misc netem genl tipc devlink rdma dcb man vdpa
> +SUBDIRS=ip
> 
> and run make like this to use static linking:
> 
> make LDFLAGS=-static
> 
> but it seems ip always needs libutil
> 
> make[1]: *** No rule to make target '../lib/libutil.a', needed by 'ip'.  Stop.
> 
> if i include lib in SUBDIRS i get many errors about missing libs like selinux and mnl
> 
> regards Frank

It is possible to mostly do a cross build if you do:

$ make CC="$CC" LD="$LD"
There are issues with netem local table generation