Calling C from FORTRAN under Unix

[Steve Emmerson]

In <1991May20.232613.19802 at agate.berkeley.edu> jerry at 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 at unidata.ucar.edu        ...!ncar!unidata!steve