[Mesa-dev] [Libclc-dev] opencl-example: didn't compile (run) with latest LLVM git (for some days)

Emil Velikov emil.l.velikov at gmail.com
Wed Oct 4 13:51:51 UTC 2017


[dropping the libclc-devel list, which annoying rejects people who are
not subscribed]

On 3 October 2017 at 13:48, Emil Velikov <emil.l.velikov at gmail.com> wrote:
> On 20 September 2017 at 18:26, Jan Vesely <jan.vesely at rutgers.edu> wrote:
>> adding mesa-dev. This is not really related to libclc.
>>
>> On Wed, 2017-09-20 at 12:50 +0200, Dieter N├╝tzel via Libclc-dev wrote:
>>> Worked OK with older version (for me latest was #6c9f36933c5) but with
>>> your 'clover: Fix build after LLVM r313390' reverted.
>>>
>>> Now I get this during compilation tries:
>>>
>>> /opt/opencl-example> make
>>> gcc -o hello_world hello_world.o cl_simple.o cl_util.o -L/usr/local/lib
>>> -lOpenCL
>>> /usr/local/lib64/libOpenCL.so: undefined reference to
>>> `llvm::LLVMContext::getDiagnosticHandler() const at LLVM_6.0'
>>> /usr/local/lib64/libOpenCL.so: undefined reference to
>>> `llvm::isKnownNonNull(llvm::Value const*)@LLVM_6.0'
>>> /usr/local/lib64/libOpenCL.so: undefined reference to
>>> `llvm::DIBuilder::createCompileUnit(unsigned int, llvm::DIFile*,
>>> llvm::StringRef, bool, llvm::StringRef, unsigned int, llvm::StringRef,
>>> llvm::DICompileUnit::DebugEmissionKind, unsigned long, bool,
>>> bool)@LLVM_6.0'
>>
>> This is odd, this function is pretty old.
>>
>>> /usr/local/lib64/libOpenCL.so: undefined reference to
>>> `llvm::LLVMContext::setDiagnosticHandler(void (*)(llvm::DiagnosticInfo
>>> const&, void*), void*, bool)@LLVM_6.0'
>>> collect2: error: ld returned 1 exit status
>>> make: *** [Makefile:10: hello_world] Fehler 1
>>>
>>> Greetings,
>>> Dieter
>>>
>>> For reference (running '/opt/amdgpu-pro/bin/clinfo'):
>>>
>>> /opt/opencl-example> /opt/amdgpu-pro/bin/clinfo
>>> /opt/amdgpu-pro/bin/clinfo: /usr/local/lib64/libOpenCL.so.1: no version
>>> information available (required by /opt/amdgpu-pro/bin/clinfo)
>>> /opt/amdgpu-pro/bin/clinfo: /usr/local/lib64/libOpenCL.so.1: no version
>>> information available (required by /opt/amdgpu-pro/bin/clinfo)
>>> ATTENTION: default value of option mesa_glthread overridden by
>>> environment.
>>> ATTENTION: default value of option radeonsi_assume_no_z_fights
>>> overridden by environment.
>>> ATTENTION: default value of option radeonsi_commutative_blend_add
>>> overridden by environment.
>>> ATTENTION: default value of option mesa_glthread overridden by
>>> environment.
>>> Number of platforms:                             1
>>>    Platform Profile:                              FULL_PROFILE
>>>    Platform Version:                              OpenCL 1.1 Mesa
>>> 17.3.0-devel (git-94fef19509)
>>>    Platform Name:                                 Clover
>>>    Platform Vendor:                               Mesa
>>>    Platform Extensions:                           cl_khr_icd
>>>
>>>
>>>    Platform Name:                                 Clover
>>> Number of devices:                               1
>>>    Device Type:                                   CL_DEVICE_TYPE_GPU
>>>    Vendor ID:                                     1002h
>>>    Max compute units:                             36
>>>    Max work items dimensions:                     3
>>>      Max work items[0]:                           256
>>>      Max work items[1]:                           256
>>>      Max work items[2]:                           256
>>>    Max work group size:                           256
>>>    Preferred vector width char:                   16
>>>    Preferred vector width short:                  8
>>>    Preferred vector width int:                    4
>>>    Preferred vector width long:                   2
>>>    Preferred vector width float:                  4
>>>    Preferred vector width double:                 2
>>>    Native vector width char:                      16
>>>    Native vector width short:                     8
>>>    Native vector width int:                       4
>>>    Native vector width long:                      2
>>>    Native vector width float:                     4
>>>    Native vector width double:                    2
>>>    Max clock frequency:                           1411Mhz
>>>    Address bits:                                  64
>>>    Max memory allocation:                         6010904166
>>>    Image support:                                 No
>>>    Max size of kernel argument:                   1024
>>>    Alignment (bits) of base address:              1024
>>>    Minimum alignment (bytes) for any datatype:    128
>>>    Single precision floating point capability
>>>      Denorms:                                     No
>>>      Quiet NaNs:                                  Yes
>>>      Round to nearest even:                       Yes
>>>      Round to zero:                               No
>>>      Round to +ve and infinity:                   No
>>>      IEEE754-2008 fused multiply-add:             No
>>>    Cache type:                                    None
>>>    Cache line size:                               0
>>>    Cache size:                                    0
>>>    Global memory size:                            8587005952
>>>    Constant buffer size:                          2147483647
>>>    Max number of constant args:                   16
>>>    Local memory type:                             Scratchpad
>>>    Local memory size:                             32768
>>> /opt/amdgpu-pro/bin/clinfo: relocation error:
>>> /usr/local/lib64/libOpenCL.so.1: symbol
>>> _ZN4llvm11LLVMContext20setDiagnosticHandlerEPFvRKNS_14DiagnosticInfoEPvES4_b,
>>> version LLVM_6.0 not defined in file libLLVM-6.0svn.so with link time
>>> reference
>>
>> this looks like libLLVM-6.0svn.so is an older version than what you
>> built clover against. Did you rebuild and reinstall llvm after r313390?
>>
> Some ideas/things to debug:
>  - does libOpenCL.so comes from Mesa or it's the ocl-icd/another package
>  - what do you get for `ldd -r /path/to/libOpenCL.so | grep undefined'
>  - the latter should always be zero since we tell the linker to error
> out in our builds
Just checked Mesa --{en,dis}able-opencl-icd - both binaries have zero
unresolved symbols.

>  - wrong library gets picked at the wrong place
>  - symbol versioning is not working properly
>
... so it's likely either of these two.
AFAICT LLVM 5.0 is the first upstream version with symbol versioning,
but you're using older so that cannot be it.

Keep in mind that since you have your LLVM in /usr/local/lib your
runtime linker should be through to look in there.
If that's your issue please look up on ldconfig, LD_PRELOAD or LD_LIBRARY_PATH.

Note that llvm-config has silently changed/broken its behaviour, so I
had to fixup --disable-llvm-shared-libs.
Patches are coming shortly. I strongly recommend giving them a try.

Thanks
Emil


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