[mpich-discuss] MPICH 3.1.4 segfaults Clang 3.6.1 and 3.7

[Balaji, Pavan]

This is only an issue with clang on Linux, right?  (I couldn't quite tell from the email chain).  On Mac OS/X, we already disable weak symbols, so this shouldn't occur.

Can someone remind me why we didn't simply add a check in our configure to say if compiler == clang, then disable weak symbols?

  -- Pavan





On 9/2/15, 4:57 PM, "Rob Latham" <robl at mcs.anl.gov> wrote:

>
>
>On 09/02/2015 02:29 AM, Torbjörn Klatt wrote:
>> Hello,
>>
>> I'm trying to use MPICH 3.1.4 with Clang and tried Clang 3.6.1 and 3.7. With
>> both versions Clang segfaults at the same point:
>>
>> pt2pt/greq_start.c:239:62: error: alias must point to a defined variable or
>> function
>>          MPIX_Grequest_class *greq_class)
>> __attribute__((weak,alias("MPIX_Grequest_class_create")));
>>
>> I've filed a LLVM bug [1] with more details, however without response yet.
>>
>>
>> MPICH was configured with:
>>
>> CC=clang CXX=clang++ /opt/toolchains/src/mpi/mpich/3.1.4/configure --
>> srcdir=/opt/toolchains/src/mpi/mpich/3.1.4 --
>> prefix=/opt/toolchains/clang/3.7/libraries/mpi/mpich/3.1.4 --enable-g=most --
>> enable-fast=all --enable-fortran=all --enable-cxx
>>
>>
>> Is this a known MPICH problem or am I doing something wrong?
>
>It's been a long-standing annoyance on our end as well:
>
>We sort of fixed this two+ years ago:
>http://trac.mpich.org/projects/mpich/ticket/1815
>
>then something happened about 6-ish months ago:
>http://trac.mpich.org/projects/mpich/ticket/2236
>
>My ubuntu bug report appears to have garnered exactly zero attention:
>https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-snapshot/+bug/1439865
>
>As it's a clang compiler error, it's hard to know what the workaround 
>would be.  Thanks for trying 3.6.1 and 3.7.    At least we can rule out 
>"fixed in newer versions"
>
>You will find this same segfault in mpich-master: we haven't done 
>anything on our end to work around it, unfortunately.
>
>==rob
>
>-- 
>Rob Latham
>Mathematics and Computer Science Division
>Argonne National Lab, IL USA
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