[LLVMdev] [cfe-dev] http://llvm.org/apt/ with 'old' gcc: Request for comments

[Arnaud Allard de Grandmaison]

Hi Sylvestre,

The easiest is probably to have a dependency to (and use) clang-3.4 to
bootstrap.

Cheers,
--
Arnaud



On Wed, Dec 25, 2013 at 4:06 PM, Sylvestre Ledru <sylvestre at debian.org>wrote:

> Hello,
>
> Just a quick refresh, on llvm.org/apt/ [1], I am rebuilding the sources
> of LLVM to create snapshot packages for the stable branches
> and development branches (currently, 3.4, in the hope of point releases
> and 3.5). This currently targets 2 releases of Debian and 4 of Ubuntu
> [2] and the llvm
> toolchain is built using the compiler shipped with the distribution.
>
> Following the recent discussions on the usage of C+11, we have now/soon
> a requirement on having a recent and C++11 compiler. [3]
> That requires a recent version of gcc (for example, 4.6 is not working).
> Unfortunately, more recent versions are not available in Debian wheezy
> (current stable) or Ubuntu precise (an Ubuntu LTS).
>
> The usage of a backported version of gcc is not really feasible because
> it would trigger a dependency on libstdc++ 4.8 [4] and the installation
> by the user
> of the backported gcc.
>
> For now, the obvious solution would be to drop the support of these
> releases but there are still many users of these distributions.
>
> Any suggestions? Static linkage of libstdc++? Usage of libc++? Usage of
> clang 3.4 to bootstrap them?
>
> Thanks,
> Sylvestre
>
> [1] http://llvm.org/apt/
> [2] http://llvm-jenkins.debian.net/
> [3] For example, currently, lldb fails to build with
>
> /tmp/buildd/llvm-toolchain-snapshot-3.5~svn197872/tools/lldb/source/../include/lldb/Utility/Iterable.h:197:22:
> sorry, unimplemented: non-static data member initializers
>
> /tmp/buildd/llvm-toolchain-snapshot-3.5~svn197872/tools/lldb/source/../include/lldb/Utility/Iterable.h:197:22:
> error: 'constexpr' needed for in-class initialization of static data
> member 'm_mutex' of non-integral type
> or fails to link with:
> http://llvm.org/bugs/show_bug.cgi?id=18077
> [4] http://llvm.org/bugs/show_bug.cgi?id=18272
>
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