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Subject: Re: [OMPI users] Compiling OpenMPI with PGI pgc++
From: Jiri Kraus (jkraus_at_[hidden])
Date: 2014-01-29 12:10:48


Hi Jeff,

thanks for taking a look. I don't want to mix compiler tool chains. I have just double checked my configure line and I am passing

        CXX=pgc++ CC=pgcc FC=pgfortran F77=pgfortran ...

so there are only PGI compilers used.

Thanks

Jiri

> Date: Wed, 29 Jan 2014 16:24:08 +0000
> From: "Jeff Squyres (jsquyres)" <jsquyres_at_[hidden]>
> To: Open MPI Users <users_at_[hidden]>
> Subject: Re: [OMPI users] Compiling OpenMPI with PGI pgc++
> Message-ID: <C7F17676-833E-4A51-AD9E-DE988C5D2E0F_at_[hidden]>
> Content-Type: text/plain; charset="us-ascii"
>
> That sounds about right.
>
> What's happening is that OMPI has learned a bunch about the C compiler
> before it does this C++ link test. In your first case (which is assumedly with
> gcc), it determines that it needs _GNU_SOURCE set -- or some other test has
> caused that to be set. Then it uses that with pgc++ and runs into the error you
> show below.
>
> Is there a reason you want to mix gcc and pgc++? It's usually simpler/better to
> use a single compiler suite for the whole thing.
>
>
> On Jan 29, 2014, at 10:54 AM, Jiri Kraus <jkraus_at_[hidden]> wrote:
>
> > Hi,
> >
> > I am trying to compile OpenMPI 1.7.3 with pgc++ (14.1) as C++ compiler.
> During configure it fails with
> >
> > checking if C and C++ are link compatible... no
> >
> > The error from config.log is:
> >
> > configure:18205: checking if C and C++ are link compatible
> > configure:18230: pgcc -c -DNDEBUG -fast conftest_c.c
> > configure:18237: $? = 0
> > configure:18268: pgc++ -o conftest -DNDEBUG -fast conftest.cpp
> conftest_c.o >&5
> > conftest.cpp:
> > "conftest.cpp", line 21: error: "_GNU_SOURCE" is predefined; attempted
> > redefinition ignored
> > #define _GNU_SOURCE 1
> > ^
> >
> > "conftest.cpp", line 86: error: "_GNU_SOURCE" is predefined; attempted
> > redefinition ignored
> > #define _GNU_SOURCE 1
> > ^
> >
> > "conftest.cpp", line 167: warning: statement is unreachable
> > return 0;
> > ^
> >
> > 2 errors detected in the compilation of "conftest.cpp".
> >
> > When I use pgcpp instead of pgc++ OpenMPI configures and builds.
> >
> > I am using
> >
> > CXX=pgcpp|pgc++ CC=pgcc FC=pgfortran F77=pgfortran CFLAGS=-fast
> FCFLAGS=-fast FFLAGS=-fast CXXFLAGS=-fast ./configure --with-
> hwloc=/shared/apps/rhel-6.2/tools/hwloc-1.7.1 --enable-hwloc-pci --with-cuda -
> -prefix=/home-2/jkraus/local/openmpi-1.7.3/pgi-14.1/cuda-5.5.22
> >
> > to configure OpenMPI. Any Idea what caused the errors with pgc++?
> >
> > Thanks
> >
> > Jiri
> >
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> --
> Jeff Squyres
> jsquyres_at_[hidden]
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