[cfe-dev] libc++ supporting older compilers

[Marshall Clow via cfe-dev]

On http://libcxx.llvm.org/docs/#platform-and-compiler-support, we say:

The following minimum compiler versions are strongly recommended.
>


* Clang 3.5 and above
> * GCC 4.7 and above.
>


Anything older may work.


We're having more and more trouble supporting pre-4.7 versions of gcc,
especially in C++03 mode.

Much of the early gcc support was driven by the fact that Apple was never
going to move past gcc 4.2.1, and the necessity of supporting that compiler
- but that ship has sailed.

I'd like to officially drop support for those compilers.

Opinions?

-- Marshall
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