[llvm-dev] [RFC] Increase minimum supported GCC version for building LLVM to 4.8

[Reid Kleckner via llvm-dev]

+1. I've been bitten by the 4.7 STL's lack of std::map::emplace a few
times, so I support this.

On Wed, Oct 12, 2016 at 3:51 PM, Teresa Johnson via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> According to the documentation at http://llvm.org/docs/
> GettingStarted.html#software, compiling LLVM with GCC requires at least
> version 4.7.0. However, there are apparently several problems building
> current LLVM/Clang with gcc 4.7.X. This proposal is to increase the minimum
> required GCC to 4.8.
>
> This is split off of the thread started here:
>    http://lists.llvm.org/pipermail/llvm-dev/2016-October/105742.html
> which is a fairly recent regression in being able to compile LTO.cpp with
> GCC 4.7.4, which I tracked down to a known GCC bug.
>
> According to James Knight, it is not the only place where GCC 4.7.X cannot
> compile the clang toolchain, which apparently hasn't been buildable by GCC
> 4.7.X in >3 months:
>    http://lists.llvm.org/pipermail/llvm-dev/2016-October/105825.html
>
> Renato also suggests bumping the minimum to 4.8, as that is the oldest
> shipped version in most stable Linux distributions:
>    http://lists.llvm.org/pipermail/llvm-dev/2016-October/105826.html
>
> We currently have many buildbots building with GCC 4.8, but none with GCC
> 4.7.X, which is why this issue was not discovered previously.
>
> Thoughts?
>
> Thanks,
> Teresa
>
> --
> Teresa Johnson |  Software Engineer |  tejohnson at google.com |
> 408-460-2413
>
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