Re: 20030113: netcdf library, gcc-3.2.1

>To: address@hidden
>From: Hein Zelle <address@hidden>
>Subject: netcdf library, gcc-3.2.1
>Organization: UCAR/Unidata
>Keywords: 200301132154.h0DLs1x06322

Hi,

> I would like to report that I managed to compile the NetCDF library
> (3.5.0) using linux and gcc-3.2.1. I am not sure if anyone else had
> success with this sofar, but I would like to tell you what I had to do
> to get it to work, so you can include it in a next version.
> 
> options to build:
> 
> CPPFLAGS=-Df2cFortran 
> CXXFLAGS=-Wno-deprecated 
> CXX=g++ 
> 
> I had to set the -Wno-deprecated flags because netcdf uses the old C++
> header files (like <iostream.h>) instead of the new ones
> (<iostream>). This may not be required, but it saves a lot of long
> warning messages.

Yes, thanks.  The C++ interface is updated in the 3.5.1-beta10
version, available from:

  ftp://ftp.unidata.ucar.edu/pub/netcdf/netcdf-beta.tar.Z

I've tested this with the 3.2 versions of gcc/g++/g77 and it seems to
work OK now.

> I had to modify the configure script to accept and detect my g++
> compiler: it found an error trying to compile the test program. In the
> test program
> 
> #line 1230 "configure"
> #include "confdefs.h"
> //#ifdef __cplusplus
> //extern "C" void exit(int);
> //#endif
> 
>                                 #include <iostream.h>
>                                 int main() {
>                                     cout << "";
>                                     return 0;
>                                 }
> 
> I had to comment out the line "extern "C" void exit(int);", because
> g++ was complaining about a different kind of exception being thrown
> by in the declaration and implementation of exit(). Without that line
> it worked fine, but it may be better to actually fix the code. Why is
> that line included anyway?

Good question.  It's unfortunately generated automatically by the old
version of autoconf we used to generate the configure script from a
"configure.in" file.  Before releasing this version, I would like to
update it to use the current autoconf/automake/libtool packages, so we
don't have problems like this.

> Finally I had to change a few things in
> 
> netcdf.cpp, lines 157, 360, 391:       
> change 
>        friend NcFile;
> to
>        friend class NcFile;
> 
> ncvalues.cpp, lines 307, 319
> change
>        long save=os.flags();
> to
>        std::_Ios_Fmtflags save = os.flags();
> 
> 
> After these changes the library compiles without errors or warnings,
> and passes all the tests in 'make test', especially the C++ ones.
> If you would like to have a copy of my modified version, let me know
> and I will send it to you.

If it's convenient, I would appreciate you trying the netcdf-beta
version referenced above, to make sure it works OK on your platform.
I recently tried it with version 3.3 of gcc/g77/g++ on Mac OS X, and
found I needed CFLAGS=-no-cpp-precomp in addition:

  CC=/usr/local/bin/gcc
  CPPFLAGS=-Df2cFortran
  CFLAGS=-no-cpp-precomp
  FC=/usr/local/bin/g77
  CXX=/usr/local/bin/g++

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu