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Re: [netcdfgroup] Compiling with Gfortran compilers (4.4.1) for 32 vs 64 bit

  • To: Russ Rew <russ@xxxxxxxxxxxxxxxx>
  • Subject: Re: [netcdfgroup] Compiling with Gfortran compilers (4.4.1) for 32 vs 64 bit
  • From: Larry Baker <baker@xxxxxxxx>
  • Date: Fri, 13 Aug 2010 12:08:09 -0700
Russ,
That explains why I didn't see an "ff" library. I decided that it was not worth using shared libraries for our cluster; the compiles are done on the front end and the jobs run on compute nodes. I would have to create and maintain libso/libso64 directories on every compute node (which I do for the compilers libso/libso64 redistributables).
I compiled completely separate netCDF libraries for every OS/compiler combination. I found that not only the lib directory files were different, but the Fortran 90 modules were different, at least between the 32-bit and 64-bit versions. Thus, the usual practice of a single include directory and separate lib and lib64 library directories does not work. 

Larry Baker
US Geological Survey
650-329-5608
baker@xxxxxxxx

On Aug 13, 2010, at 11:54 AM, Russ Rew wrote:


Larry Baker wrote:
...

My build does not have a library named libnetcdff.a, so I'm not sure
if we are configuring netCDF the same way:


Starting with version 3.6.2, building separate Fortran libraries was
required for shared library builds.  In previous releases, the C and
Fortran functions were in the same static library. In current releases, when you enable shared libraries an additional library, libnetcdff (note the extra "f"), contains the Fortran-77 and Fortran-90 functions. This 
extra Fortran library is built when either --enable-shared or
--enable-separate-fortran are specified as configure options.  Using
--enable-shared automatically turns on --enable-separate-fortran.

One reason you may want to use the --enable-separate-fortran option is
to support multiple netCDF Fortran libraries for different Fortran
compilers.

--Russ
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