On 11 Oct 2015, at 14:05, Piotr Kubaj <[email protected]> wrote: > > AFAIK if there had been such plans, they were dropped long ago. The > reasoning it can't be done (at least for now) is that versions 3.5.0+ > require C++11-capable stack and that would break upgrades from 9-STABLE > (if the user still uses GCC, as is by default). So, LLVM in stable/10 > will probably be upgraded when stable/9 goes EOL.
If stable/10 had clang 3.5 or higher, you could still upgrade from stable/9. It would only require you to do the upgrade in two steps: * Rebuild and reinstall your stable/9 world using WITH_CLANG, WITH_CLANG_IS_CC, and WITH_LIBCPLUSPLUS. This will install clang 3.4.1 and libc++, and make clang the default compiler. * Checkout stable/10 (or even head), and build/install it in the regular fashion. I am personally not against merging newer llvm/clang versions into stable/10. But the "silent agreement" has always been that you could upgrade easily from the latest stable/X to stable/X+1, and the above two-step process breaks that, or at least makes it more complicated. Last but not least, note that this would only apply to the architectures that *can* actually build clang 3.4.1 and libc++ on stable/9. This is currently limited to x86, little-endian arm and powerpc (64 bit, I'm unsure about 32 bit). -Dimitry
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