llvm dev - Dec 2013 - [LLVMdev] [cfe-dev] http://llvm.org/apt/ with 'old' gcc: Request for comments

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

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
>
> _______________________________________________
> cfe-dev mailing list
> cfe-dev at cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
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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
>
>     _______________________________________________
>     cfe-dev mailing list
>     cfe-dev at cs.uiuc.edu <mailto:cfe-dev at cs.uiuc.edu>
>     http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
>
>
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