GCC < 4.8.0 does not support emplace* in associative containers

[leper]

The documentation for 4.6.* claims to support it while it does not. (See ​https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44436) 4.7 has the documentation updated to indicate the missing support.

This breaks the build on Ubuntu 12.04 (and since the default gcc for 14.04 is 4.7 likely also for that). Build log: ​https://launchpadlibrarian.net/214230683/buildlog_ubuntu-precise-amd64.0ad_0.0.18%2Br16914-0ubuntu1~12.04~wfg0_BUILDING.txt.gz.

CppSupport should be updated to include this information.

At least r16894 and r16887 should partially be reverted.

[historic_bruno]

I updated the CppSupport page, but I don't know the status of Clang 3.1 support in this case. If anyone finds that info, they can update the page :)

[leper]

Judging from ​http://llvm.org/releases/2.8/docs/ReleaseNotes.html (libc++ header) it should be supported in Clang 3.1, which was released about 1.5 years later. Sadly ​http://libcxx.llvm.org/index.html only has pages for C++1x (C++14) and C++1y, but I guess that only implies C++11 being fully supported.

Thanks for updating the page already!

[leper]

In 16922:

Revert emplace for associative containers. Fixes #3366.

GCC < 4.8.0 does not support emplace for those.
See ​https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44436.

[leper]

Above revisions should be all that's needed to fix the compilation on 4.6. I also reverted some uses of emplace on boost map containers so that there is not confusion when looking at the code.