Re: [netcdfgroup] Building NetCDF 4.1.3 with two different compilers

• To: Larry Baker <baker@xxxxxxxx>
• Subject: Re: [netcdfgroup] Building NetCDF 4.1.3 with two different compilers
• From: Jim Edwards <edwards.jim@xxxxxxxxx>
• Date: Tue, 6 Dec 2011 14:19:19 -0700

The tool in netcdf to recognize the compiler is crude at best, I think that
it just failed to recognize gfortran44 as being gfortran.

On Tue, Dec 6, 2011 at 2:16 PM, Larry Baker <baker@xxxxxxxx> wrote:

> Mary,
>
> There should be a compiler option that controls whether and how many
> underscores get added to external names by the compiler.  It sounds like
> the default for that option has changed on you.  I am not at work, so I
> cannot check what my gcc says about it.  But, you should be able to easily
> find the option.  Try gcc --help -v and gfortran --help -v.
>
> Larry Baker
> US Geological Survey
> 650-329-5608
> baker@xxxxxxxx
>
>
>
>
> On Dec 6, 2011, at 10:42 AM, Mary Haley wrote:
>
> >
> > I'm running into an oddity when building NetCDF 4.1.3 on the same Linux
> system, but with different versions of gcc and gfortran (4.1.2 versus
> 4.4.4).
> >
> > When I use 4.1.2, I don't get a second underscore after Fortran routine
> names, when the Fortran routine name already has an underscore.  When I use
> 4.4.4, I get this second underscore, which causes an undefined reference
> when linking NetCDF with another package.
> >
> > I need to know how I can make sure that second underscore doesn't get
> appended?
> >
> >
> --------------------------------------------------------------------------------------------------
> >
> > For gcc/gfortran 4.1.2, I'm using the following settings:
> >
> > setenv CPPFLAGS
> '-I/glade/proj2/ncldev/install/mirage/netcdf-4.1.3-esmf/include
> -I/glade/proj2/ncldev/install/mirage/external/include'
> > setenv LDFLAGS
> '-L/glade/proj2/ncldev/install/mirage/netcdf-4.1.3-esmf/lib
> -L/glade/proj2/ncldev/install/mirage/external/lib'
> >
> > setenv FC gfortran
> > setenv F77 gfortran
> > setenv F90 gfortran
> > setenv CC gcc
> > setenv CXX g++
> >
> > setenv CFLAGS -fPIC
> > setenv FFLAGS '-fPIC -fno-second-underscore'
> > setenv F90FLAGS '-fPIC -fno-second-underscore'
> > setenv FCFLAGS '-fPIC -fno-second-underscore'
> > setenv CXXFLAGS -fPIC
> >
> > make clean
> > make distclean
> >
> > ./configure --disable-netcdf-4 --disable-dap --enable-f90
> --disable-shared
> --prefix=/glade/proj2/ncldev/install/mirage/netcdf-4.1.3-esmf
> >
> > make all install
> > make install
> >
> > and I get what I'd expect:
> >
> > % nm
> /glade/proj2/ncldev/install/mirage/netcdf-4.1.3-esmf/lib/libnetcdff.a |
> grep nf_inq_libvers
> > 0000000000000333 T nf_inq_libvers_
> >                 U nf_inq_libvers_
> >
> > Note there's only one underscore after "nf_inq_libvers" in both cases.
> >
> >
> --------------------------------------------------------------------------------------------------
> > For gcc/gfortran 4.4.4, I only change the following settings:
> >
> > setenv FC gfortran44
> > setenv F77 gfortran44
> > setenv F90 gfortran44
> > setenv CC gcc44
> > setenv CXX g++44
> >
> > I then get:
> >
> > % nm
> /glade/proj2/ncldev/install/mirage/netcdf-4.1.3-esmf/lib/libnetcdff.a |
> grep nf_inq_libvers
> > 0000000000000301 T nf_inq_libvers__
> >                 U nf_inq_libvers_
> >
> > Note the second underscore in one case, but not the other.
> >
> >
> --------------------------------------------------------------------------------------------------
> >
> > Is there some code I can modify to make sure that second underscore
> doesn't get added?
> >
> > Thanks,
> >
> > --Mary
> >
> > _______________________________________________
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> > netcdfgroup@xxxxxxxxxxxxxxxx
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>



-- 

Jim Edwards

• Follow-Ups:
  • Re: [netcdfgroup] Building NetCDF 4.1.3 with two different compilers
    • From: Mary Haley

• References:
  • [netcdfgroup] Building NetCDF 4.1.3 with two different compilers
    • From: Mary Haley
  • Re: [netcdfgroup] Building NetCDF 4.1.3 with two different compilers
    • From: Larry Baker