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re: linking fortran subs

From: Mumit Khan
Subject: re: linking fortran subs
Date: Fri, 25 May 2001 08:42:40 -0500 (CDT)

On Fri, 25 May 2001, Phil Cummins wrote:

> error: /home/cummins/src/seis/ttimes/octtst.oct: undefined symbol: s_rsue:
> /home/cummins/src/seis/ttimes/octtst.oct `FSocttst__Fv'
> error: /home/cummins/src/seis/ttimes/octtst.oct: undefined symbol: s_rsue:
> /home/cummins/src/seis/ttimes/octtst.oct `_FSocttst__Fv'

fyi, ``FSocttst__Fv'' is the GNU C++ mangled name for ``FSocttst(void)''.

The symbol s_rsue is defined your Fortran runtime library, which mkoctfile
does not link in by default. Just add -lg2c if you're using gcc/g77 or the
appropriate Fortran runtime if you're using some other Fortran compiler
when building the .oct file.

If you don't know what the Fortran runtime libraries needed are for your
compiler/platform, look at the FLIBS member of the structure returned by
  octave:1> foo = octave_config_info;
  octave:2> a.FLIBS
  ans = -lg2c -lm -L/usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66
  -L/usr/i386-redhat-linux/lib -lm


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