The C++11 support in 4.9 (which is still marked as experimental) did see
some incompatible changes with the unordered associative containers in
<unordered_map> and <unordered_set. There are no other ABI changes in
c++11 mode, maybe except for users of the <future> header. It is not
advised to mix c++11 code built from different major compiler versions
as long as the c++11 mode is still marked as experimental.
There are a few things to do here:
- find out which packages are affected (currently working on that)
- make sure that all packages are built using verbose builds, or else we cannot
scan the build logs for packages built in c++11 mode.
- if this is code ending up in libraries, the soname of the library should be
bumped where
the upstream can do that, or the package name of the library should be
changed.
- if the code is ending up in leaf packages, just rebuild the package
- Don't use versioned build dependencies for g++-4.x at all (preferred), or
use the
same version for all packages within a project.
Packages in main affected are:
dbus-cpp
libcolumbus
firefox
mir
process-cpp
libreoffice (only the clang plugin which is not built)
qtbase-opensource-src
unity
The ubuntu-toolchain-r/test PPA know has a gcc-defaults again defaulting
to 4.9. Please make sure that you have a build dependency on g++ (>=
4:4.9.0-3ubuntu6) when building with 4.9.
** Also affects: process-cpp (Ubuntu)
Importance: Undecided
Status: New
** Also affects: mir (Ubuntu)
Importance: Undecided
Status: New
** Also affects: qtbase-opensource-src (Ubuntu)
Importance: Undecided
Status: New
** Also affects: unity (Ubuntu)
Importance: Undecided
Status: New
** Also affects: firefox (Ubuntu)
Importance: Undecided
Status: New
** Changed in: location-service (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1329089
Title:
g++-4.9 binary incompatibilties with libraries built with g++-4.8
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