[arch-dev-public] gcc-4.7.1-5 rebuild

[Allan McRae]

Hi all,

gcc-4.7 introduced some c++11 support, but unfortunately this resulted
in a changed ABI for files compiled with c++98/03 support and those
complied with c++11.  So, if a library used c++11 but linked to a
library using c++98, there could be crashes due to incompatibilities
between these.

The gcc-4.7.1-5 package uses a snapshot with the needed patches to fix
this issue.  However, c++11 code compiled with any earlier 4.7.x version
possibly be incompatible with c++11 code compiled with gcc-4.7.1-5 and
above and anything compiled with c++98/03.

I have created a TODO list that includes everything linking to
libstdc++.so and that was built since gcc-4.7.0 entered the repos.  It
is a big list, but only software that used --std=c++11 when compiling
need recompiled.  Look at your build output (you do keep the logs for
future reference...) and decide if your package needs recompiled or not.

More details:
http://jaegerandi.blogspot.com.au/2012/07/gcc-47-c-abi-changes-and-opensuse-122.html
http://gcc.gnu.org/gcc-4.7/changes.html
http://gcc.gnu.org/git/?p=gcc.git;a=commit;h=a245605f
http://gcc.gnu.org/git/?p=gcc.git;a=commit;h=74ca4097

Allan