Is this a regression introduced in Ubuntu?

The SVN sources for clang 3.5.0 and 3.5.1 both contain the fix
introduced in rL201729.

This bug seriously limits the usefulness of clang 3.5 on Ubuntu, as it also 
suffers from a serious bug in libstdc++-4.8 (see, for example, 
http://lists.cs.uiuc.edu/pipermail/llvmbugs/2014-January/032040.html). At this 
point, the following appear to be impossible on Ubuntu 14.04:
 - Using clang++ in c++11 mode to compile (anything including) cstdio from 
gcc-4.8.
 - Using clang++ in c++11 mode to compile (anything including) cstddef from 
gcc-4.9.
 - Using clang++ in c++11 mode to compile (anything including) both cstdio and 
cstddef from *any* gcc.

A good example of a project in the last category is clang itself: it
requires c++11 mode, cstdio and cstddef.

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https://bugs.launchpad.net/bugs/1401202

Title:
  clang-3.5 fails to compile C++11 files after installing gcc-4.9

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