add dll im/ex port

demo/kww_countterms.c

 /* kww_counterms.c
- * 
+ *
  * Copyright (C) 2009 Joachim Wuttke
- * 
+ *
  * Licence: GNU General Public License, version 3 or later
  *
  * Author:
@@ -17,7 +17,7 @@
 #include <math.h>
 #include "kww.h"
 
-extern int kww_num_of_terms;
+KWW_IMPORT extern int kww_num_of_terms;
 
 double kwwc_lim_low( const double beta );
 double kwwc_lim_hig( const double beta );

demo/runkww.c

 /* runkww.c
- * 
+ *
  * Copyright (C) 2009 Joachim Wuttke
- * 
+ *
  * Licence: GNU General Public License, version 3 or later
  *
  * Author:
@@ -16,7 +16,9 @@
 #include <stdlib.h>
 #include "kww.h"
 
-extern int kww_algorithm, kww_num_of_terms, kww_debug;
+KWW_IMPORT extern int kww_algorithm;
+KWW_IMPORT extern int kww_num_of_terms;
+KWW_IMPORT extern int kww_debug;
 
 int main( int argc, char **argv )
 {

lib/kww.c

@@ -43,7 +43,10 @@
 #define PI_2         1.57079632679489661923L  /* pi/2 */
 #define SQR(x) ((x)*(x))
 
-int kww_algorithm, kww_num_of_terms, kww_debug=0; // for external analysis
+// for external analysis:
+KWW_EXPORT int kww_algorithm;
+KWW_EXPORT int kww_num_of_terms;
+KWW_EXPORT int kww_debug=0;
 
 /*****************************************************************************/
 /*  Numeric precision and maximum number of terms                            */

lib/kww.h

@@ -2,17 +2,17 @@
  *   Calculation of the Kohlrausch-Williams-Watts spectrum, i.e.
  *   Laplace-Fourier transform of the stretched exponential function exp(-t^b).
  *   Frequently used to describe relaxation in disordered systems.
- * 
+ *
  * Copyright:
  *   (C) 2009, 2012 Joachim Wuttke
- * 
+ *
  * Licence:
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published
  *   by the Free Software Foundation; either version 3 of the License, or
  *   (at your option) any later version. Alternative licenses can be
  *   obtained through written agreement from the author.
- * 
+ *
  *   This program is distributed in the hope that it will be useful,
  *   but without any warranty; without even the implied warranty of
  *   merchantability or fitness for a particular purpose.
@@ -46,6 +46,14 @@
 #endif
 __BEGIN_DECLS
 
+#if _WIN32
+#define KWW_EXPORT __declspec(dllexport)
+#define KWW_IMPORT __declspec(dllimport)
+#else
+#define KWW_EXPORT
+#define KWW_IMPORT
+#endif
+
 /*****************************************************************************/
 /*  High-level calls                                                         */
 /*****************************************************************************/