Re: unmet dependencies in crossbuild-essential-armhf
On Sat, Mar 03, 2018 at 08:39:15AM -0600, Christopher Koenig wrote:
> We've recently started seeing (on Jessie) these failures from "apt-get
> install crossbuild-essential-armhf":
>
> The following packages have unmet dependencies:
> crossbuild-essential-armhf :
> Depends: gcc-arm-linux-gnueabihf (>= 4.9.1-1) but it is not going
> to be installed
> Depends: g++-arm-linux-gnueabihf (>= 4.9.1-1) but it is not going
> to be installed
> E: Unable to correct problems, you have held broken packages.
>
> It looks like this may be a recurrence of an earlier problem ([1]):
> recently gcc-4.9 upgraded ([2]) from 4.9.2-10 to 4.9.2-10+deb8u1,
> but gcc-4.9-arm-linux-gnueabihf and g++-4.9-arm-linux-gnueabihf (both still
> at 4.9.2-10) have a strict dependency on the 4.9.2-10 packages ([3]).
>
> [1] https://lists.debian.org/debian-embedded/2015/03/msg00001.html
> [2]
> http://metadata.ftp-master.debian.org/changelogs/main/g/gcc-4.9/gcc-4.9_4.9.2-10+deb8u1_changelog
> [3] http://emdebian.org/tools/debian/dists/jessie/main/binary-amd64/Packages
This is still a problem. For what it's worth, my workaround is to
block or downgrade the upgrade to gcc-4.9 via APT pinning. Add the
following file and `apt-get install crossbuild-essential-*` ought to
work. Note your native and cross toolchains will lose 4.9.2-10+deb8u1's
backport of the retpoline mitigation for Spectre (according to gcc-4.9's
changelog[1]).
/etc/apt/preferences.d/emdebian-gcc-4.9.2-10.pref:
-- 8< --
Explanation: Emdebian's cross-compilers depend on gcc-4.9 (= 4.9.2-10)
Explanation: Prevent or downgrade the recent security update
Package: cpp-4.9:* g++-4.9:* gcc-4.9:* gcc-4.9-base:* libasan1:* \
libatomic1:* libcilkrts5:* libgcc-4.9-dev:* libgomp1:* libitm1:* \
liblsan0:* libquadmath0:* libstdc++-4.9-dev:* libstdc++6:* \
libtsan0:* libubsan0:*
Pin: version 4.9.2-10
Pin-Priority: 1001
Explanation: Emdebian's cross-compilers depend on gcc-4.9 (= 4.9.2-10)
Explanation: Prevent or downgrade the recent security update
Package: libgcc1:*
Pin: version 1:4.9.2-10
Pin-Priority: 1001
-- >8 --
-- Ryan
[1]: http://metadata.ftp-master.debian.org/changelogs/main/g/gcc-4.9/gcc-4.9_4.9.2-10+deb8u1_changelog
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