netdev - Re: Crosscompiling iproute2

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Date:   Tue, 25 May 2021 09:08:46 -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 Tue, 25 May 2021 17:56:09 +0200
Frank Wunderlich <frank-w@...lic-files.de> wrote:

> Am 24. Mai 2021 23:36:20 MESZ schrieb Stephen Hemminger <stephen@...workplumber.org>:
> >On Mon, 24 May 2021 21:06:02 +0200
> >Frank Wunderlich <frank-w@...lic-files.de> wrote:
> >  
> >> Am 17. Mai 2021 21:36:28 MESZ schrieb Stephen Hemminger  
> ><stephen@...workplumber.org>:  
> >> >On Mon, 17 May 2021 09:44:21 +0200
> >> >This works for me:
> >> >
> >> >make CC="$CC" LD="$LD" HOSTCC=gcc    
> >> 
> >> Hi,
> >> 
> >> Currently have an issue i guess from install. After compile i install  
> >into local directory,pack it and unpack on target system
> >(/usr/local/sbin).tried  
> >> 
> >> https://github.com/frank-w/iproute2/blob/main/crosscompile.sh#L17  
> >  
> >> 
> >> Basic ip commands work,but if i try e.g. this
> >> 
> >> ip link add name lanbr0 type bridge vlan_filtering 1  
> >vlan_default_pvid 500  
> >> 
> >> I get this:
> >> 
> >> Garbage instead of arguments "vlan_filtering ...". Try "ip link  
> >help".  
> >> 
> >> I guess ip tries to call bridge binary from wrong path (tried  
> >$PRFX/usr/local/bin).  
> >> 
> >> regards Frank  
> >
> >No ip command does not call bridge.
> >
> >More likely either your kernel is out of date with the ip command (ie
> >new ip command is asking for
> >something kernel doesn't understand);  
> I use 5.13-rc2 and can use the same command with debians ip command
> 
> >or the iplink_bridge.c was not
> >compiled as part of your compile;
> >or simple PATH issue
> >or your system is not handling dlopen(NULL) correctly.  
> 
> Which lib does ip load when using the vlanfiltering option?
It is doing dlopen of itself, no other library

> 
> >What happens is that the "type" field in ip link triggers the code
> >to use dlopen as form of introspection (see get_link_kind)  
> 
> I can use the command without vlan_filtering option (including type bridge).
> 
> Maybe missing libnml while compile can cause this? had disabled in config.mk and was not reset by make clean,manual delete causes build error,see my last mail
> 
> You can crosscompile only with CC,LD and HOSTCC set?

libmnl is needed to get the error handling and a few other features.