[Bf-committers] Buildbot cuda-hack

[Francesc Juhe]

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
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> 
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