Use C linkage for all libespeak internal headers.

The libespeak files are supposed to be C code, so use C linkage
for all the functions defined in that code when they are being
referenced in the C++ code (i.e. espeakedit).

src/compiledata.cpp

 
 extern void FindPhonemesUsed(void);
 extern void DisplayErrorFile(const char *fname);
-extern int utf8_in(int *c, const char *buf);
-extern int utf8_out(unsigned int c, char *buf);
+extern "C" int utf8_in(int *c, const char *buf);
+extern "C" int utf8_out(unsigned int c, char *buf);
 extern void DrawEnvelopes();
 extern void ReadPhondataManifest();
 char path_source[sizeof(path_home)+20];

src/debug.h

 #ifndef DEBUG_H
 #define DEBUG_H
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 //#define DEBUG_ENABLED
 
 #ifdef DEBUG_ENABLED
 #define ENTER(text)
 #endif
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif

src/espeak_command.h

 #endif
 #include "speak_lib.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 enum t_espeak_type
   {
     ET_TEXT,
 
 int sync_espeak_terminated_msg(unsigned int unique_identifier, void* user_data);
 
+#ifdef __cplusplus
+}
+#endif
+
 //>
 #endif

src/event.h

 
 #include "speak_lib.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 // Initialize the event component.
 // First function to be called.
 // the callback will be called when the event actually occurs.
 // Last function to be called.
 void event_terminate();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/fifo.h

 #include "espeak_command.h"
 #include "speak_lib.h"
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 // Initialize the fifo component.
 // First function to be called.
 void fifo_init();
 // Returns 1 if yes, or 0 otherwise.
 int fifo_is_command_enabled();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/klatt.h

-
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 
 #define CASCADE_PARALLEL 1         /* Type of synthesis model */
 #define ALL_PARALLEL     2
 }  klatt_peaks_t;
 
 
+#ifdef __cplusplus
+}
+#endif

src/options.cpp

 /***************************************************************************
  *   Copyright (C) 2005 to 2013 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
- *   Copyright (C) 2013 by Reece H. Dunn                                   *
+ *   Copyright (C) 2013-2015 by Reece H. Dunn                              *
  *                                                                         *
  *   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  *
 
 #include "options.h"
 
-extern void WavegenInit(int samplerate, int wavemult_fact);
+extern "C" void WavegenInit(int samplerate, int wavemult_fact);
 extern void strncpy0(char *to,const char *from, int size);
 extern int GetNumeric(wxTextCtrl *t);
 extern void SetNumeric(wxTextCtrl *t, int value);

src/phoneme.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2010 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2015 by Reece H. Dunn                                   *
  *                                                                         *
  *   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  *
  *               <http://www.gnu.org/licenses/>.                           *
  ***************************************************************************/
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 
 
 // phoneme types
 
 extern PHONEME_TAB_LIST phoneme_tab_list[N_PHONEME_TABS];
 extern int phoneme_tab_number;
+
+#ifdef __cplusplus
+}
+#endif

src/sintab.h

+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 short int sin_tab[2048] = {
    0, -25, -50, -75, -100, -125, -150, -175,
    -201, -226, -251, -276, -301, -326, -351, -376,
    401, 376, 351, 326, 301, 276, 251, 226,
    201, 175, 150, 125, 100, 75, 50, 25,
     };
+
+#ifdef __cplusplus
+}
+#endif

src/speech.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
- *   Copyright (C) 2013 Reece H. Dunn                                      *
+ *   Copyright (C) 2013-2015 Reece H. Dunn                                 *
  *                                                                         *
  *   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  *
 
 #include <sys/types.h>
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #if defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
 #define ARCH_BIG
 #endif
 char *Alloc(int size);
 void Free(void *ptr);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif // SPEECH_H

src/synthesize.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2014 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2015 by Reece H. Dunn                                   *
  *                                                                         *
  *   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  *
  *               <http://www.gnu.org/licenses/>.                           *
  ***************************************************************************/
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 #define espeakINITIALIZE_PHONEME_IPA   0x0002   // move this to speak_lib.h, after eSpeak version 1.46.02
 
 
 void KlattReset(int control);
 int Wavegen_Klatt2(int length, int modulation, int resume, frame_t *fr1, frame_t *fr2);
 
+#ifdef __cplusplus
+}
+#endif

src/translate.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2014 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2015 by Reece H. Dunn                                   *
  *                                                                         *
  *   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  *
  *               <http://www.gnu.org/licenses/>.                           *
  ***************************************************************************/
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
 
 #define L(c1,c2)  (c1<<8)+c2          // combine two characters into an integer for translator name
 
 extern FILE *f_trans;		// for logging
 extern FILE *f_logespeak;
 extern int logging_type;  // from config file
+
+#ifdef __cplusplus
+}
+#endif

src/voice.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2015 by Reece H. Dunn                                   *
  *                                                                         *
  *   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  *
  *               <http://www.gnu.org/licenses/>.                           *
  ***************************************************************************/
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 
 
 typedef struct {
 void ReadTonePoints(char *string, int *tone_pts);
 void VoiceReset(int control);
 
+#ifdef __cplusplus
+}
+#endif

src/wave.h

 #include "stdint.h"
 #endif
 
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
 extern int option_device_number;
 
 extern int wave_init(int samplerate);
 // for tests
 extern void *wave_test_get_write_buffer();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif