[netcdfgroup] Building NetCDF 4.1.3 with two different compilers

• To: NetCDF Group List <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: [netcdfgroup] Building NetCDF 4.1.3 with two different compilers
• From: Mary Haley <haley@xxxxxxxx>
• Date: Tue, 6 Dec 2011 11:42:20 -0700

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

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