Brian,
there used to be two hwloc.h : the one from the hwloc libraries, and
the one from the OMPI MCA framework.
as a side effect, we could not --with-hwloc=external, but we had to
--with-hwloc=/usr, which leads to add
-I/usr/include to the CPPFLAGS.
so you might end up having
CPPFLAGS=-I/usr/include -I/.../internal_libevent/include ...
which means that if libevent is also installed in /usr, you do not use
the internal libevent as you expected.
Jeff avoided this scenario by having the option to rename the
framework header file (e.g. opal/mca/hwloc/hwloc.h was moved to
hwloc-internal.h), so --with-hwloc=external works now, and there is no
more -I/usr/include in the CPPFLAGS
i am not sure we can run into this issue with libevent nor pmix since
their base component do not need to #include
the external pmix.h nor event.h
note this is not 100% bulletproof yet
if you have both hwloc and libevent in /opt/include and /opt/lib, you
have to --with-hwloc=/opt and you will likely
use the external libevent too
Cheers,
Gilles
On Thu, Apr 6, 2017 at 3:59 AM, r...@open-mpi.org wrote:
> It could be that a fairly recent change was made to fix that conflict. I
> believe Jeff and Gilles modified the internal hwloc header name(s) to ensure
> we got the right one of those. However, that didn’t get done for libevent
> and/or pmix, so the conflict likely still resides there.
>
>> On Apr 5, 2017, at 11:56 AM, Barrett, Brian via devel
>
>> wrote:
>>
>> Right; that’s what I built. I had both libevent and hwloc installed in
>> /usr. I configured with —with-hwloc=external. It built against the
>> external hwloc and the internal libevent. So there must be some slight
>> variation on the theme I’m missing.
>>
>> Brian
>>
>>> On Apr 5, 2017, at 11:36 AM, r...@open-mpi.org wrote:
>>>
>>> Not quite the problem I mentioned. The problem arises if you want external
>>> hwloc, but internal libevent - and both have external versions in (say)
>>> /usr. If you point hwloc there, then the -I and -L flags will cause us to
>>> pull in the /usr libevent versions instead of the internal ones - and havoc
>>> ensues.
>>>
>>>
On Apr 5, 2017, at 11:30 AM, Barrett, Brian via devel
wrote:
All -
On the telecon yesterday, there was discussion of external hwloc causing
problems if libevent was also installed in the same location. Does anyone
have details on exactly what the failure mode is? I tried what I think is
the issue (./configure —with-hwloc=external with libevent installed in
/usr/ as well) and everything built / works fine. I checked the library
paths and include and everything looks normal, so I must have the wrong
scenario. Hints?
Thanks,
Brian
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