OpenWrt/LEDE: dropbear & MIPS & gcc 7.1.0

[Matt Johnston]

Hi Syrone,

Updating libtom makes sense, it's on the todo list.

I'm curious if it's a bug in old libtommath or new gcc. In my experience differences between optimisation levels are more often problems with the compiler, but could be either.
If you could get a backtrace of a stuck "dbclient" built with gcc 7 it might be useful to see what's going on (and to know where to look in the libtommath commit log)

Cheers,
Matt

> On Thu 1/6/2017, at 2:28 pm, Syrone Wong <wong.syrone at gmail.com> wrote:
> 
> Hi all,
> 
> Recently, I upgrade my LEDE toolchain to binutils 2.28 & GCC 7, notice
> I cannot SSH to router.
> 
> A more detailed description can be found
> (http://lists.infradead.org/pipermail/lede-dev/2017-May/007753.html),
> later, Kevin find it might related to libtommath
> (http://lists.infradead.org/pipermail/lede-dev/2017-May/007797.html).
> 
> Two possible solution:
> 
> i. change libtommath compilation flag from -Os to -O2:
> http://lists.infradead.org/pipermail/lede-dev/2017-May/007843.html
> 
> ii. update the bundled libtom* to latest:
> http://lists.infradead.org/pipermail/lede-dev/2017-May/007849.html
> 
> Please update the bundled libraries to latest, or help to find the root cause.
> 
> Thanks in advance
> 
> Best Regards,
> Syrone Wong