f2c support

[John W. Eaton]

On 21-Aug-2007, Evgeniy Dushistov wrote:

| I try to compile last cvs snapshot "--with-f2c",
| but configure says that libf2c doesn't exists, and after long build,
| link failed.
| 
| I have libf2c and f2c on my system, to force it compile I have to made such 
changes:
| ---
| Index: configure.in
| ===================================================================
| RCS file: /cvs/octave/configure.in,v
| retrieving revision 1.570
| diff -u -r1.570 configure.in
| --- configure.in        30 Jul 2007 18:36:01 -0000      1.570
| +++ configure.in        20 Aug 2007 12:45:56 -0000
| @@ -774,7 +774,11 @@
|        CONFLIB_ARG="-MD"
|        ;;
|    esac
| -  AC_CHECK_LIB(f2c, f_open, FLIBS=-lf2c, FLIBS=, $CONFLIB_ARG)
| +#  AC_CHECK_LIB(f2c, f_open, FLIBS=-lf2c, FLIBS=, $CONFLIB_ARG)
| +#  if test -z "$FLIBS"; then
| +       AC_DEFINE_UNQUOTED(F77_DUMMY_MAIN, MAIN__)
| +       AC_CHECK_LIB(f2c, f_open, FLIBS=-lf2c, FLIBS=, $CONFLIB_ARG)
| +#  fi
|    rm -f $oct_conflib
|  
|    if test -z "$FLIBS"; then
| Index: liboctave/f2c-main.c
| ===================================================================
| RCS file: /cvs/octave/liboctave/f2c-main.c,v
| retrieving revision 1.5
| diff -u -r1.5 f2c-main.c
| --- liboctave/f2c-main.c        26 Apr 2005 19:24:28 -0000      1.5
| +++ liboctave/f2c-main.c        20 Aug 2007 12:45:57 -0000
| @@ -20,6 +20,9 @@
|  02110-1301, USA.
|  
|  */
| +#ifdef HAVE_CONFIG_H
| +#include <config.h>
| +#endif
|  
|  #include <assert.h>
|  
| ----
| As you can see, linking with libf2c require MAIN__ definition, so 
| simple check "AC_CHECK_LIB(f2c..." failed, also to successfully link octave 
with libf2c
| somewhere in octave should exist function "MAIN__".
| 
| May be someone from maintainers can assist me in integrating some kind of 
such changes 
| into mainline, so in future I can build octave without problems?

What kind of system do you have that doesn't have some kind of Fortran
compiler (g77?, gfortran?).

jwe