[Bf-committers] Buildbot cuda-hack

[Sergey Sharybin]

Hi,

Is it possible to somehow automatically detect which OpenMP library to use
without need to hard-code it per-compiler-version? Maybe using try_compile
CMake trickery?

On Sun, Aug 28, 2016 at 8:37 PM, Francesc Juhe <fjuhec at gmail.com> wrote:

> I run a few tests regarding clang and omp after installing OSX 10.11 and
> Xcode 7.3.1.
>
> It seems that clang-omp-3.5 from libs can’t compile using OSX 10.11 SDK.
>
> So, I downloaded clang 3.7.0 and 3.8.0 darwin binaries from official page
> and both compile blender ok after a minor modification on cmake.
>
> diff --git a/build_files/cmake/platform/platform_apple.cmake
> b/build_files/cmake/platform/platform_apple.cmake
> index b28b748..ec40400 100644
> --- a/build_files/cmake/platform/platform_apple.cmake
> +++ b/build_files/cmake/platform/platform_apple.cmake
> @@ -376,8 +376,13 @@ if(WITH_OPENMP)
>                 message(STATUS "Using special OpenMP enabled compiler !")
> # letting find_package(OpenMP) module work for gcc
>                 if(CMAKE_C_COMPILER_ID MATCHES "Clang") # clang-omp in
> darwin libs
>                         set(OPENMP_FOUND ON)
> -                       set(OpenMP_C_FLAGS "-fopenmp" CACHE STRING "C
> compiler flags for OpenMP parallization" FORCE)
> -                       set(OpenMP_CXX_FLAGS "-fopenmp" CACHE STRING "C++
> compiler flags for OpenMP parallization" FORCE)
> +                       if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.7)
> +                               set(OpenMP_C_FLAGS "-fopenmp" CACHE STRING
> "C compiler flags for OpenMP parallization" FORCE)
> +                               set(OpenMP_CXX_FLAGS "-fopenmp" CACHE
> STRING "C++ compiler flags for OpenMP parallization" FORCE)
> +                       else()
> +                               set(OpenMP_C_FLAGS "-fopenmp=libiomp5"
> CACHE STRING "C compiler flags for OpenMP parallization" FORCE)
> +                               set(OpenMP_CXX_FLAGS "-fopenmp=libiomp5"
> CACHE STRING "C++ compiler flags for OpenMP parallization" FORCE)
> +                       endif()
>                         include_directories(${LIBDIR}/openmp/include)
>                         link_directories(${LIBDIR}/openmp/lib)
>                         # This is a workaround for our helperbinaries (
> datatoc, masgfmt, ... ),
>
> After the tests I have not found any issues with cuda 7.5 and xcode 7.3.1
> or clang 3.7/3.8 but I guess it’s because I am using the latest version and
> is seems to have fixed incompatible compiler issues but as I don’t know
> what the cuda-hack does, I am not sure.
>
> Any comment on what the cuda-hack does/solves is very welcome.
>
> Thanks,
> Francesc
>
> On 26 Aug 2016, at 19:08, Jens Verwiebe <info at jensverwiebe.de> wrote:
>
> > I'd say cuda8 is pointless for you right now, cause pascal gpu is not
> > yet supported by the NV/OSX (Quadro-) drivers.
> >
> > You would definitely loose openmp capability unless you compile and use
> > a vanilla clang 3.7 which supports it.
> >
> >
> > Jens
> >
> >
> > Am 26.08.2016 um 18:11 schrieb Francesc Juhe:
> >> Hi,
> >>
> >> Some time ago noticed this commit https://developer.blender.org/
> rB3a24e6320f31a790ea9d3c912a35db2186140b71 changing the nvcc compiler on
> builbot but I did not give it much though as I was having no issues
> compiling with cuda 7.5 and clang 3.5 from libs folder on OSX 10.9. But now
> with CUDA 8 it seems I have to update to OSX 10.11 and Xcode 7.3.
> >>
> >> So, how does this cuda-hack work?
> >> Also, OSX buildbot builds seem to be compiled without OpenMP but
> release builds are compiled with it. What are the appropriate steps for
> building a release build?
> >>
> >> Thank you,
> >> Francesc
> >>
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> >
> > --
> >
> > Jens Verwiebe
> > Allerskehre 44 - 22309 Hamburg
> >
> > Tel.: +49 40 68 78 50
> > mobile: +49 172 400 49 07
> > mailto: info at jensverwiebe.de
> > web: http://www.jensverwiebe.de
> >
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-- 
With best regards, Sergey Sharybin