[Llvm-bgq-discuss] [maint at libelemental.org] Elemental build issues using bgclang on ALCF Vesta

[Jack Poulson]

On second thought, I am not exactly sure why Clang is rejecting the
code, as the relevant member variables *are* static constexpr's:

https://github.com/elemental/Elemental/blob/master/include/El/core/DistMatrix/General.hpp#L23

Nevertheless, the issue has been sidestepped.

Jack

On 08/02/2014 03:51 PM, Jack Poulson wrote:
> Hi Sayan,
> 
> I have re-enabled the function by avoiding attempts to use non-static
> member variables in compile-time expressions:
> 
> https://github.com/elemental/Elemental/commit/d74f61e8b4ec366cecc2510de8de5ff096a77c65
> 
> I can again locally build Elemental with Clang-3.5-1ubuntu1 (trunk).
> 
> Jack
> 
> On 08/02/2014 03:31 PM, Jack Poulson wrote:
>> Hi Sayan,
>>
>> I was able to reproduce the error locally with Clang-3.5.-1ubuntu1 (trunk).
>>
>> I have therefore (at least temporarily) disabled the troublesome
>> Abstract[Block]DistMatrix::ConstructDiagonal routines since they are not
>> yet in use anywhere in the library.
>>
>> Thank you for reporting the issue!
>>
>> Jack
>>
>> On 08/01/2014 07:38 PM, Sayan Ghosh wrote:
>>> Hi,
>>>
>>> I get a lot of errors when I compile with bgclang 3.5 on ALCF Vesta, the
>>> paths of MPI/PAMI libraries have changed, so I had to make some (very
>>> minor) modifications on the specific cmake files under toolchain folder
>>> of Elemental (just removed ../gcc from _ROOT, as I see all {MPI and
>>> PAMI} libs in ../comm/lib, and had to change some of the library link
>>> names e.g -lmpich to -lmpich-gcc).  
>>>
>>> This is the error I get with bgclang:
>>>
>>> /home/sghosh/projects/Elemental/src/core/BlockDistMatrix/./setup.hpp:147:32:
>>> *error: non-type template argument is not a constant*
>>> *      expression*
>>> { return new *BlockDistMatrix<T,this->UDiag,this->VDiag>(g,root)*; }
>>>
>>> Clang++11 seems to not treat it as a compile time deterministic
>>> argument, I played around with some static_casting, but could not make
>>> it work. I am cc-ing llvm-bgclang-discuss as well, just for reporting. I
>>> cannot test it on my laptop as I don't have the latest clang build, so
>>> please excuse me. 
>>>
>>> I was able to build Elemental successfully with gnu-4.7.2 though
>>> (installed in /bgsys/drivers/ppcfloor/gnu-linux-4.7.2 - which is
>>> probably unsupported?), using the updated toolchain cmake files. 
>>>
>>> I attach 2 files: updated cmake file for BGQ-Vesta-clang-netlib, and
>>> build/include/El/config.h.
>>>
>>> -- 
>>> Regards,
>>> Sayan
>>
> 

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