yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Thanks Anton!
If I remember correctly, Vaclav was using clang to speed up compilation.
Is it not in the positive sides? Did you measure anything?

Bruno


On 24/09/12 20:29, Anton Gladky wrote:
> Dear all,
>
> Yade can now be compiled by an alternative CLANG-compiler. About 2
> years ago we have tried already to do it [1], but at that time this compiler
> was "young" and not enough good.
>
> Some of Debian-developers are working on a project of recompiling the
> whole archive by this compiler [2].
>
> Now you can try to use clang by setting up the environmental variables
> before running cmake, like described in documentation [3].
>
>   export CC=/usr/bin/clang
>   export CXX=/usr/bin/clang++
>   cmake ...
>
> Be sure, you have installed corresponding clang and LLVM packages installed
> before you do it.
>
> The negative sides of clang regarding Yade:
>   1) no OpenMP support. There are some starting projects, but still not
>       available working code.
>   2) CGAL-feature is not compilable at the moment due to some errors
>       in CGAL-headers, found by clang (should be fixed soon, I hope).
>
> Positive sides:
>   1) I have found some slight performance-increase in about 1..7%
>   2) LLVM produces additional warnings and errors during compilation
>       process, so it should improve Yade's code quality.
>
> If you find it interesting and useful, feel free to try it. Be sure you have
> the new versions of clang, llvm and boost.
>
> Cheers,
>
> Anton
>
> [1] http://www.mail-archive.com/yade-dev@xxxxxxxxxxxxxxxxxxx/msg05005.html
> [2] http://www.phoronix.com/scan.php?page=news_item&px=MTA2NjQ
> [3] https://yade-dem.org/doc/installation.html#compilation
>
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Bruno Chareyre
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