Fortran.h

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#ifndef SimTK_SimTKCOMMON_FORTRAN_H_
#define SimTK_SimTKCOMMON_FORTRAN_H_

/* -------------------------------------------------------------------------- *
 *                      SimTK Core: SimTKcommon                               *
 * -------------------------------------------------------------------------- *
 * This is part of the SimTK Core biosimulation toolkit originating from      *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2006 Stanford University and the Authors.           *
 * Authors: Michael Sherman                                                   *
 * Contributors:                                                              *
 *                                                                            *
 * Permission is hereby granted, free of charge, to any person obtaining a    *
 * copy of this software and associated documentation files (the "Software"), *
 * to deal in the Software without restriction, including without limitation  *
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,   *
 * and/or sell copies of the Software, and to permit persons to whom the      *
 * Software is furnished to do so, subject to the following conditions:       *
 *                                                                            *
 * The above copyright notice and this permission notice shall be included in *
 * all copies or substantial portions of the Software.                        *
 *                                                                            *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *
 * THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,    *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR      *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE  *
 * USE OR OTHER DEALINGS IN THE SOFTWARE.                                     *
 * -------------------------------------------------------------------------- */

// Although we are currently triggering this off the OS, these
// really are compiler dependencies. 
//      (1) The calling convention (__stdcall for Windows)
//      (2) Name capitalization (either all-lower or all-uppercase)
//      (3) Is a trailing underscore added to the name?
//      (4) And ugliest, Fortran passes string lengths as a hidden
//          value parameter. On some compilers, that length follows
//          the string immediately. On others, all the lengths
//          appear at the end of the argument list, in the same
//          order as the strings to which they correspond.
// Point (4) requires four ugly macros to be used, two in declarations
// and two in calls to Fortran routines. One macro appears immediately
// after each string, and the other appears at the end of the argument
// list, repeated as many times as necessary. One or the other will
// evaluate to nothing.

// These macros should be used for whatever the expected default
// Fortran behavior is for whatever Fortran is typically used in
// conjunction with the current C++ compiler.
#ifdef WIN32
    #define SimTK_FORTRAN_STDCALL __stdcall
    #define SimTK_FORTRAN(x,X) X
    #define SimTK_FORTRAN_STRLEN_FOLLOWS_DECL       ,int
    #define SimTK_FORTRAN_STRLEN_FOLLOWS_CALL(n)    ,n
    #define SimTK_FORTRAN_STRLEN_ATEND_DECL         // nothing
    #define SimTK_FORTRAN_STRLEN_ATEND_CALL(n)
#else
    #define SimTK_FORTRAN_STDCALL
    #define SimTK_FORTRAN(x,X) x ## _
    #define SimTK_FORTRAN_STRLEN_FOLLOWS_DECL       // nothing
    #define SimTK_FORTRAN_STRLEN_FOLLOWS_CALL(n)
    #define SimTK_FORTRAN_STRLEN_ATEND_DECL         ,int
    #define SimTK_FORTRAN_STRLEN_ATEND_CALL(n)      ,n
#endif

// These macros should be used for whatever our chosen LAPACK and
// BLAS libraries will look like from here.
#ifdef SimTK_USE_ACML_LAPACK
  #ifdef WIN32
    #define SimTK_LAPACK_STDCALL __stdcall
    #define SimTK_LAPACK(x,X) X
    #define SimTK_LAPACK_STRLEN_FOLLOWS_DECL       ,int
    #define SimTK_LAPACK_STRLEN_FOLLOWS_CALL(n)    ,n
    #define SimTK_LAPACK_STRLEN_ATEND_DECL         // nothing
    #define SimTK_LAPACK_STRLEN_ATEND_CALL(n)
  #else
    #define SimTK_LAPACK_STDCALL
    #define SimTK_LAPACK(x,X) x ## _
    #define SimTK_LAPACK_STRLEN_FOLLOWS_DECL       // nothing
    #define SimTK_LAPACK_STRLEN_FOLLOWS_CALL(n)
    #define SimTK_LAPACK_STRLEN_ATEND_DECL         ,int
    #define SimTK_LAPACK_STRLEN_ATEND_CALL(n)      ,n
  #endif
#else // default assumes we're using libSimTKlapack
    #define SimTK_LAPACK_STDCALL
    #define SimTK_LAPACK(x,X) x ## _
    #define SimTK_LAPACK_STRLEN_FOLLOWS_DECL       // nothing
    #define SimTK_LAPACK_STRLEN_FOLLOWS_CALL(n)
    #define SimTK_LAPACK_STRLEN_ATEND_DECL         ,int
    #define SimTK_LAPACK_STRLEN_ATEND_CALL(n)      ,n
#endif

// TODO: Currently this is unused and may not be needed anymore.
// Call these routines to intialize the GNU Fortran RTL.
// 

#ifdef USING_G77
    extern "C" {
        void f_setsig();
        void f_init();
    }
    #define SimTK_FORTRAN_INIT do {f_setsig(); f_init();} while(false)
#endif

#endif // SimTK_SimTKCOMMON_FORTRAN_H_

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