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

[Sylvestre Ledru]

After some thinking on this idea, it would not work because I need /
want to use Debian/Ubuntu package to do the build and clang 3.4 is not
built on these architecture :(
So, if I bootstrap clang 3.4, I will have a dependency on libstdc++
4.8... :/


On 25/12/2013 22:23, Arnaud Allard de Grandmaison wrote:
> 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
> <mailto:sylvestre at debian.org>> wrote:
>
>     Hello,
>
>     Just a quick refresh, on llvm.org/apt/ <http://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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>

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