Re: Rebuilding xl2tpd
On Wed, Jun 08, 2016 at 07:45:07PM +0000, Mark Morgan Lloyd wrote:
> I've been trying to rebuild xl2tpd 1.3.6 (rationale etc. below) on a
> Raspberry Pi before moving to the next version since its changelog suggests
> that it fixes a problem we're experiencing. Whether I use pukka Debian
> Jessie as described at
> http://sjoerd.luon.net/posts/2015/02/debian-jessie-on-rpi2/ or the current
> Raspbian Lite, the stripped binaries come out about 1K smaller than expected
> and crash the system as soon as there's network traffic.
>
> Looking at the original and newly-built binaries using readelf, I can see
> that the original has reference to
>
> 0x00000001 (NEEDED) Shared library: [ld-linux-armhf.so.3]
>
> which the new one lacks. I also see that the original has
>
> Displaying notes [...]
> Attribute Section: aeabi
> File Attributes
> Tag_CPU_name: "7-A"
> Tag_CPU_arch: v7
> Tag_CPU_arch_profile: Application
> Tag_ARM_ISA_use: Yes
> Tag_THUMB_ISA_use: Thumb-2
> Tag_FP_arch: VFPv3-D16
>
> while the new one has
>
> Displaying notes [...]
> Attribute Section: aeabi
> File Attributes
> Tag_CPU_name: "6"
> Tag_CPU_arch: v6
> Tag_ARM_ISA_use: Yes
> Tag_THUMB_ISA_use: Thumb-1
> Tag_FP_arch: VFPv2
>
> Does this indicate that the makefile etc. has failed to work out the target
> architecture correctly?
>
> I'm a comparative beginner at building stuff on Debian, although I've been
> doing it for rather a long time on lesser distreaux. Are there any obvious
> gotchas that I need to be aware of, or anything Pi-specific that might need
> to be added to the makefile?
>
> Background info: Our ISP (Andrews & Arnold in the UK) provides a service
> where customers may connect using PPP-over-L2TP via e.g. 4G, which allows
> mailservers etc. to remain routable even if a copper/fibre line goes down.
> Using xl2tpd 1.3.6 I'm finding that the daemon freezes when the connection
> is broken, the changelog for 1.3.7 suggests that this is a fixed problem.
> There's also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=760602 which
> might be relevant.
Did you get that backwards? For a raspberry pi, you need the v6 code.
Normal Debian armhf uses v7 with thumb-2 and would only work on a
raspberry pi 2 or better, not the original.
--
Len Sorensen
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