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From: steve@groucho.ucar.edu (Steve Emmerson)
Newsgroups: comp.lang.c,comp.lang.fortran,comp.unix.questions
Subject: Re: Calling C from FORTRAN under Unix
Message-ID: <11484@ncar.ucar.edu>
Date: 21 May 91 02:42:51 GMT
References: <1991May20.232613.19802@agate.berkeley.edu>
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Followup-To: comp.lang.c
Organization: University Corporation for Atmospheric Research (UCAR)
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In <1991May20.232613.19802@agate.berkeley.edu> jerry@violet.berkeley.edu 
(Jerry Berkman;217E;24804;;ZA78) writes:

>By the way, fort is not the only compiler which doesn't use underscores.
>The Cray CFT77 compiler under UNICOS (Cray's version of UNIX) also converts
>the name to upper case and does not add any underscores.  But neither
>do the Cray C compilers, so you can call the routine "ABC" in C and
>link successfully.  I believe the IBM AIX Fortran and C compilers both
>just add a period in front of the name, i.e. ".abc".

That is correct (at least for the text segment).  Another machine/compiler
combination that doesn't add an underscore is Next/Absoft.

The issue of Fortran-callable C functions can cause considerable problems
when attempting to write portable "jacket" interfaces to C libraries.

Steve Emmerson        steve@unidata.ucar.edu        ...!ncar!unidata!steve