[petsc-dev] Possible error running C/C++ src/snes/examples/tutorials/ex19 with 1 MPI process

[Antonio Trande]

On 10/13/2016 02:31 AM, Satish Balay wrote:
> On Wed, 12 Oct 2016, Satish Balay wrote:
> 
>> On Wed, 12 Oct 2016, Antonio Trande wrote:
>>
>>> Latest builds:
>>> http://copr-fe.cloud.fedoraproject.org/coprs/sagitter/petsc/build/464373/
> 
>> I'll try and see if I can reproduce this.. [in a 32bit VM]..
> 
> To start off - I looked at all the 5 32bit build logs in 464373 - and
> they don't have any C or OpeMPI tests crashing anymore.  I remember
> seeing these crashes in some of the previous logs. Any idea what fixed
> this?

There are errors.
https://copr-be.cloud.fedoraproject.org/results/sagitter/petsc/fedora-rawhide-i386/00464373-petsc/build.log.gz

> 
> And wrt the fortran example [with non-mpi build] crashing - somehow
> the following appears to make a difference:
> 
> FFLAGS=-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
> 
> balay at localhost petsc]$ cat /usr/lib/rpm/redhat/redhat-hardened-cc1
> *cc1_options:
> + %{!r:%{!fpie:%{!fPIE:%{!fpic:%{!fPIC:%{!fno-pic:-fPIE}}}}}}
> [balay at localhost petsc]$ 
> 
> For one - this doesn't look like something gfortran would use or
> invoke - and yet - its affected by it. Its changing the behavior of
> fortran common blocks - and adds a couple of entries in the object
> file created (somefort.o) - I don't know what they do..
> 
> <          U _GLOBAL_OFFSET_TABLE_
> < 00000000 T __x86.get_pc_thunk.ax
> 
> 
> Is it possible to remove this option from FFLAGS? [with 'FOPTFLAGS=']

They are flags automatically set for "hardened" builds
(https://fedoraproject.org/wiki/Changes/Harden_All_Packages#Detailed_Harden_Flags_Description).

I can disable and set them manually.

New builds:

Without "/usr/lib/rpm/redhat/redhat-hardened-cc1" flags:
http://copr-fe.cloud.fedoraproject.org/coprs/sagitter/petsc/build/464687/

Same configuration for debugging:
http://copr-fe.cloud.fedoraproject.org/coprs/sagitter/petsc/build/464692/

On Fedora builds, i see this warning without any other info:

*******************Error detected during compile or link!*******************
See http://www.mcs.anl.gov/petsc/documentation/faq.html
/builddir/build/BUILD/petsc-3.7.4/buildopenmpi_dir/src/snes/examples/tutorials
ex19
*********************************************************************************



-- 
---
Antonio Trande
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