[Bf-committers] Clang errors when compiling the Cycles CUDA kernel in Blender

Mon Feb 10 22:39:44 CET 2014

See: Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
Means you have an xcode that only comes with clang ( aka 5.x + )
For CUDA kernelcompile with clang,you need CUDA 5.5 or higher !
This is also documented by NVidia.
You'll have no other chance if you use newest xcode which only comes with clang.
Clang has no -dumspecs option.

BTW:: the remaining gcc and llvm-gcc are SHIM#s for bw-compatibility and 
plain point to clang again.

Jens

Am 10.02.2014 um 22:33 schrieb Brecht Van Lommel <brechtvanlommel at pandora.be>:

> I don't have a list of such tricks. This is just the way CMake works,
> it has a number of variables that in the configuration that can be
> changed, most of them have a description that explains what they do,
> I'm just pointing out the one needed for this particular case.
> 
> On Mon, Feb 10, 2014 at 10:03 PM, Piotr Arłukowicz <piotao at inf.ug.edu.pl> wrote:
>> Dear Brecht,
>> 
>> where can I find more such tricks? Are they documented somewhere? I mean,
>> in relation to better utilize Cycles power in Blender.
>> 
>> best regards
>> Piotr
>> 
>> 
>> 2014-02-10 21:06 GMT+01:00 Brecht Van Lommel <brechtvanlommel at pandora.be>:
>> 
>>> It should possible to change the CUDA_NVCC_EXECUTABLE variable and add
>>> "-ccbin=/usr/bin/llvm-gcc-4.2".
>>> 
>>> On Mon, Feb 10, 2014 at 7:28 PM, Sen Haerens <sen at senhaerens.be> wrote:
>>>> The kernel compilation succeeded by adding "-ccbin=/usr/bin/llvm-gcc-4.2"
>>>> argument to nvcc and running manually.
>>>> Could this be specified somewhere in cmake?
>>>> 
>>>> It appears to be an issue in Mountain Lion (10.8.5).
>>>> 
>>> https://devtalk.nvidia.com/default/topic/608127/clang-error-on-os-x-10-8-5-samples-/
>>>> 
>>>> 
>>>> 
>>>> On Mon, Feb 10, 2014 at 6:33 PM, Sen Haerens <sen at senhaerens.be> wrote:
>>>> 
>>>>> Hi,
>>>>> 
>>>>> I'm getting the following Clang errors when trying to compile the Cycles
>>>>> CUDA kernel in Blender.
>>>>> 
>>>>> Read new prefs: /Users/sen/Library/Application
>>>>> Support/Blender/2.69/config/userpref.blend
>>>>> found bundled python:
>>>>> 
>>> /Users/sen/Documents/Sources/blender_master/cmake/bin/blender.app/Contents/MacOS/2.69/python
>>>>> Compiling CUDA kernel ...
>>>>> "/Developer/NVIDIA/CUDA-5.0/bin/nvcc" -arch=sm_21 -m64 --cubin
>>>>> 
>>> "/Users/sen/Documents/Sources/blender_master/cmake/bin/blender.app/Contents/MacOS/2.69/scripts/addons/cycles/kernel/
>>>>> kernel.cu" -o "/Users/sen/Library/Application
>>>>> 
>>> Support/Blender/2.69/cache/cycles_kernel_sm21_AB7D0ABB4691DC942DE6785DC3C9ADD1.cubin"
>>>>> --ptxas-options="-v" --maxrregcount=32 --use_fast_math
>>>>> 
>>> -I"/Users/sen/Documents/Sources/blender_master/cmake/bin/blender.app/Contents/MacOS/2.69/scripts/addons/cycles/kernel"
>>>>> -DNVCC -D__KERNEL_CUDA_VERSION__=50
>>>>> clang: error: unsupported option '-dumpspecs'
>>>>> clang: error: no input files
>>>>> CUDA kernel compilation failed, see console for details.
>>>>> 
>>>>> These are my build specs:
>>>>> 
>>>>> Blender 2.69 (sub 10)
>>>>> build date: 2014-02-10
>>>>> build time: 18:04:36
>>>>> build commit date: 2014-02-10
>>>>> build commit time: 16:45
>>>>> build hash: d2b5f0f
>>>>> build platform: Darwin
>>>>> build type: Release
>>>>> build c flags:  -Wall -Werror=declaration-after-statement
>>>>> -Werror=implicit-function-declaration -Werror=return-type
>>>>> -Wno-tautological-compare -Wno-unknown-pragmas -Wno-char-subscripts
>>>>> -Wstrict-prototypes -Wmissing-prototypes -Wunused-parameter
>>>>> -mmacosx-version-min=10.6  -msse2  -msse -pipe -funsigned-char
>>>>> build c++ flags:  -Wall -Wno-tautological-compare -Wno-unknown-pragmas
>>>>> -Wno-char-subscripts -Wno-overloaded-virtual -Wno-sign-compare
>>>>> -Wno-invalid-offsetof  -mmacosx-version-min=10.6 -ftemplate-depth=1024
>>>>> -msse2  -msse -pipe -funsigned-char
>>>>> build link flags: -fexceptions -framework CoreServices -framework
>>>>> Foundation -framework IOKit -framework AppKit -framework Cocoa
>>> -framework
>>>>> Carbon -framework AudioUnit -framework AudioToolbox -framework CoreAudio
>>>>> -framework QTKit -liconv
>>>>> build system: CMake
>>>>> 
>>>>> Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn)
>>>>> Target: x86_64-apple-darwin12.5.0
>>>>> Thread model: posix
>>>>> 
>>>>> nvcc: NVIDIA (R) Cuda compiler driver
>>>>> Copyright (c) 2005-2012 NVIDIA Corporation
>>>>> Built on Fri_Sep_28_16:10:16_PDT_2012
>>>>> Cuda compilation tools, release 5.0, V0.2.1221
>>>>> 
>>>>> TIA
>>>>> 
>>>> 
>>>> 
>>>> 
>>>> --
>>>> Sen Haerens | Sleutelstraat 9 1000 Brussels Belgium
>>>> Tel +32 (0)2 880 90 25 | Cell +32 (0)473 86 50 35
>>>> Vcard http://vcard.senhaerens.be/
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>> 
>> 
>> 
>> --
>> Piotr Arłukowicz, PhD
>> University of Gdańsk, Faculty of Mathematics, Physics and Informatics
>> Division of Artificial Intelligence, Wit Stwosz 57, 80-952 Gdańsk, room 121
>> phone: +48585232125, via jabber: piotao at jabber.gda.pl,
>> http://piotao.inf.ug.edu.pl/
>> Also: Polish Blender Course: http://polskikursblendera.pl/ [PL]
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