Re: Unmet dependencies problem in CrossToolchains

[John Morris <john@zultron.com>]

On 01/16/2015 01:18 PM, Wookey wrote:
> +++ Oleg Popkov [2015-01-15 23:16 +0100]:
[...]
> >     curl [3]http://emdebian.org/tools/debian/emdebian-toolchain-archive.key
> >     |apt-key add -
> >     dpkg --add-architecture powerpc
> >     dpkg --add-architecture armel
> >     sudo apt-get update
> >
> >     Everything goes fine untill the moment I want to install
> >     crossbuild-essential-armhf package, the command
> >     apt-get install crossbuild-essential-armhf
>
> OK. In a jessie chroot this works fine for powerpc and armel, except for one
> detail. dpkg-cross has been removed from jessie due to RC bugs, so
> crossbuild-essential-* is uninstallable. You have to do
> sudo apt-get install libc6-dev:armel gcc-arm-linux-gnueabi g++-arm-linux-gnueabi
> or
> sudo apt-get install libc6-dev:powerpc gcc-powerpc-linux-gnu  g++-powerpc-linux-gnu
> instead.
>
> I forgot that we still needed dpkg-cross in jessie for this. I'll see
> if it can be fixed/re-instated. If not it'll have to live in the
> emdebian repo to make things work.
>
> OK. I've uploaded dpkg-cross_2.6.11~emdeb8 to the emdebian repo to fix
> this problem for now. That can go away again if we get a better
> soution.
>
> So now
> sudo apt-get install crossbuild-essential-powerpc
> or
> sudo apt-get install crossbuild-essential-armel
> works fine.
[...]

I'm looking to do some x86_64 cross ARM builds in Jessie, and came 
across the [same instructions] as the OP.

[same instructions]: https://wiki.debian.org/CrossToolchains

Setting up the repo as described and running `apt-get install 
crossbuild-essential-armhf` fails with the error message:

    The following packages have unmet dependencies:
     crossbuild-essential-armhf : Depends: g++-arm-linux-gnueabihf
      (>= 4.9.1-1) but it is not going to be installed

The dependency problem can be traced to the emdebian.org g++ 
cross-compiler package requiring a version+release-identical libstdc++ 
package, which doesn't match the current mainline package:

    # apt-cache show g++-4.9-arm-linux-gnueabihf | grep Depends:
    Depends:  cpp-4.9-arm-linux-gnueabihf (>= 4.9.1-19),
     gcc-4.9-arm-linux-gnueabihf (= 4.9.1-19), libstdc++-4.9-dev:armhf
     (= 4.9.1-19), libc6 (>= 2.14), libcloog-isl4 (>= 0.17),
     libgmp10 (>= 2:5.0.1~), libisl10 (>= 0.10), libmpc3, libmpfr4
     (>= 3.1.2), zlib1g (>= 1:1.1.4)
    # apt-cache policy libstdc++-4.9-dev:armhf
    libstdc++-4.9-dev:armhf:
      Installed: 4.9.2-10
      Candidate: 4.9.2-10
      Version table:
     *** 4.9.2-10 0
        500 http://http.debian.net/debian/ jessie/main armhf Packages
        100 /var/lib/dpkg/status

Unstable has been on g++ v. 4.9.2 since November, but the above quote 
indicates that the emdebian.org packages worked in January, aside from a 
known complication that doesn't look like the same problem and sounds 
fixed anyway.

What am I missing?  Thanks-

	John