From owner-freebsd-questions  Tue Nov  9 14:15: 7 1999
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From: "Crist J. Clark" <cjc@cc942873-a.ewndsr1.nj.home.com>
Message-Id: <199911092218.RAA41863@cc942873-a.ewndsr1.nj.home.com>
Subject: FORTRAN Error Question
To: freebsd-questions@FreeBSD.ORG (FreeBSD Questions)
Date: Tue, 9 Nov 1999 17:18:20 -0500 (EST)
Reply-To: cjclark@home.com
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I am getting an error during the compile of some FORTRAN code that I
cannot quite diagnose. All of my files get through a 'f77 -c'
compilation fine (well, warnings about unused local variables aside),
but the final, linking step dies,

f77 -g -L/usr/local/lib -lU77 -lm cdbcmp.o cdflam.o cdfmix.o cdftrb.o cdpcmp.o drag.o  enthal.o fnbll.o fnblt.o fnffl.o fnfft.o fnfme.o     fnfp.o fnfre.o fnrgh.o fsp.o interp.o lp.o quad.o    rbbody.o rbheat.o rbout.o rbrad.o rbwall.o rexbdy.o  rsc.o rvbbp.o rvbcof.o rvbint.o rvbitp.o rvdlnt.o    rvshok.o setpt.o sp.o tonset.o trptid.o trpttj.o -o ../rsc
rvshok.o: In function `rvshok_':
/usr3/mada/cjc/rsc/src/rvshok.f(.data+0x0): multiple definition of `_BLNK__'
rvbint.o(.data+0x0):/usr3/mada/cjc/rsc/src/rvbint.f: first defined here
*** Error code 1

Stop.

The symbol '_BLNK__' or 'BLNK' never appears in any FORTRAN source
file, but it is all over the object (.o) files (not just the ones
giving the error).

I thought this might be some byproduct of the f2c process, but when I
compile with our IRIX SGI MIPSPro F77, I get,

        f77 -g -L/usr/local/lib -lU77 -lm cdbcmp.o cdflam.o cdfmix.o cdftrb.o cdpcmp.o drag.o  enthal.o fnbll.o fnblt.o fnffl.o fnfft.o fnfme.o     fnfp.o fnfre.o fnrgh.o fsp.o interp.o lp.o quad.o    rbbody.o rbheat.o rbout.o rbrad.o rbwall.o rexbdy.o  rsc.o rvbbp.o rvbcof.o rvbint.o rvbitp.o rvdlnt.o    rvshok.o setpt.o sp.o tonset.o trptid.o trpttj.o -o ../rsc
ld:
Warning: rvshok.o: _BLNK__: multiply defined
        previous (used) definition from 'rvbint.o';
        new (ignored) definition from 'rvshok.o'

So this seems to be something that occurs across platforms.

What is causing something like this? How can I fix it, can it be
fixed, at the source level? Can I coax the FreeBSD f77 to ignore the
problem and build code anyway? Or will this likely result in broken
code (and therefore is my IRIX executable probably untrustworthy)? 

I am by no means a FORTRAN guru (them is a scary bunch), so any hints
would be appreciated. Thanks.
-- 
Crist J. Clark                           cjclark@home.com


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