[cmake-developers] Can we please require TR1 to build CMake?

[Rolf Eike Beer]

> The GNU libstdc++ introduced TR1 in version 4.0. The TR1 headers have been
> put into a subdirectory. Starting with version 4.3, the headers can be
> included as in C++11 and the symbols are in namespace std, but only if the
> language mode is set to C++0x or higher. The library version number is
> stored in __GLIBCXX__.

For an entirely different reason (missing atomic support) gcc 3.4 currently 
causes trouble, as in libuv is not building. There are also failures in SHA3 
which I can't explain, and which could also be related to atomic support. So 
my suggestion would be to also drop support for gcc 3.4, i.e. require 
gcc>=4.0. The last release of gcc 3.4 is from 2006, which is close to the 
timeframe of the MSVC versions we require.

Opinions?

Eike
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