[Darshan-users] darshan3.1.5 issue on Cray XC40 cle6.up05

[Phil Carns]

Actually, one more thing as well.  What does "ld --version" show on up05?

thanks,
-Phil

On 02/27/2018 10:18 AM, Phil Carns wrote:
> On 02/27/2018 12:34 AM, Bilel Hadri wrote:
>>
>> Hi Phil,
>>
>> Sure, test_scalapack.f90 call ScaLAPACK routines and uses inside MPI 
>> library. The output of the failing ftn command with the 
>> craype-verbose flag
>>
>
> Thanks Bilel.  The petsc example helps too.  This clarifies that the 
> trigger on Cray up05 is to compile a program that doesn't directly  
> use MPI symbols on its own but instead links in another library  that 
> indirectly uses MPI symbols on its behalf.
>
> This isn't an unusual use case (scalapack and petsc have done this 
> forever), and the linker options in Darshan are set up to handle it, 
> but something has obviously changed in the linker in this respect in 
> this update.
>
> We are still trying to work out how to reproduce this but it may be a 
> little bit.  In the mean time would you be willing to try something in 
> your 3.1.5 install to help debug?
>
> Can you manually edit 
> /sw/xc40cle6/darshan/3.1.5/sles12.3_gcc7.2.0/share/ld-opts/darshan-base-ld-opts 
> and add this line to the top of the file, then try again to compile 
> your examples with 3.1.5 loaded?
>
> --undefined=__wrap_MPI_Init
>
> By my (admittedly slightly murky) interpretation of the link order and 
> the flags that we are setting, that shouldn't be necessary, but it 
> would be helpful to see what it does for your example.
>
> thanks,
>
> -Phil
>

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