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Subject: Re: [OMPI users] OpenMPI with NAG compiler and gcc 4.6
From: Ning Li (ning.li_at_[hidden])
Date: 2011-07-04 15:35:52


Can someone comments on my post below? I just wonder if this is
something that should be fixed in OMPI's configure script or elsewhere.

Ning

On 27/06/11 10:24, Ning Li wrote:
> Hello,
>
> I built OpenMPI 1.5.3 using NAG compiler v 5.2 on a new system running
> Fedora 15 (with gcc 4.6). OpenMPI can be built successfully, but when
> I compile a Fortran MPI application I got an error at link stage:
>
> gcc: error: unrecognized option '--export-dynamic'
>
> Note that NAG Fortran compiler generates intermediate C code and
> actually calls gcc to build the application.
>
> GCC 4.6 release note contains the following: "GCC now has stricter
> checks for invalid command-line options. In particular, when |gcc| was
> called to link object files rather than compile source code, it would
> previously accept and ignore all options starting with |--|, including
> linker options such as |--as-needed| and |--export-dynamic|, although
> such options would result in errors if any source code was compiled.
> Such options, if unknown to the compiler, are now rejected in all
> cases; if the intent was to pass them to the linker, options such as
> |-Wl,--as-needed| should be used."
>
> My next step was to track down where the illegal syntax was generated,
> using the '-showme' option provided by the OpenMPI compiler wrapper
> and '-dryrun' option provided by NAG compiler.
>
> [lining_at_combe pi]$ /home/lining/software/openmpi/1.5.3/nag/bin/mpif90
> --showme pi.f90 -o pi.exe_nag
> nagfor pi.f90 -o pi.exe_nag
> -I/home/lining/software/openmpi/1.5.3/nag/include -pthread
> -I/home/lining/software/openmpi/1.5.3/nag/lib
> -L/home/lining/software/openmpi/1.5.3/nag/lib -lmpi_f90 -lmpi_f77
> -lmpi -lnsl -lutil -lm -ldl -Wl,--export-dynamic -lnsl -lutil -lm -ldl
>
> [lining_at_combe pi]$ /home/lining/software/openmpi/1.5.3/nag/bin/mpif90
> -dryrun pi.f90 -o tpi.exe_nag
> NAG Fortran Compiler Release 5.2(721)
> Option warning: Unrecognised option -pthread passed to loader
> /home/lining/software/NAG_Fortran/lib/forcomp -checkversion 5.2 721
> -I/home/lining/software/openmpi/1.5.3/nag/include
> -I/home/lining/software/openmpi/1.5.3/nag/lib -library
> /home/lining/software/NAG_Fortran/lib -o /tmp/pi.024444.c pi.f90
> /usr/bin/gcc -I/home/lining/software/NAG_Fortran/lib -c -DANSI_C
> -DINT64=long long -funsigned-char -march=i686 -Wno-pointer-sign -o
> pi.o /tmp/pi.024444.c
> /usr/bin/gcc -o pi.exe_nag
> /home/lining/software/NAG_Fortran/lib/quickfit.o pi.o -pthread
> -L/home/lining/software/openmpi/1.5.3/nag/lib -lmpi_f90 -lmpi_f77
> -lmpi -lnsl -lutil -lm -ldl -lnsl -lutil -lm -ldl
> -Wl,-rpath,/home/lining/software/NAG_Fortran/lib
> /home/lining/software/NAG_Fortran/lib/libf52.so
> /home/lining/software/NAG_Fortran/lib/libf52.a -lm --export-dynamic
>
> So OpenMPI generates the '-Wl,--export-dynamic' flag. When this is
> passed to NAG compiler, NAG compiler interprets this as "passing the
> '--export-dynamic' flag to the linker (gcc)" (which I believe is the
> correct behaviour). But gcc 4.6 expects to see '-Wl,--export-dynamic'.
>
> My temporary solution as supplied by NAG compiler developers is to
> edit share/openmpi/*-wrapper-data.txt and put flag
> '-Wl,-Wl,,--export-dynamic' there.
>
> Ning
>
> --
> Ning Li
> Technical Consultant
> Numerical Algorithms Group
>
>
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________________________________________________________________________
The Numerical Algorithms Group Ltd is a company registered in England
and Wales with company number 1249803. The registered office is:
Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom.

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