autotools: add support for disabling Klatt (--without-klatt/--with-klatt=no)

Makefile.am

 libespeak_include_HEADERS = \
 	src/speak_lib.h
 
+common_FLAGS  =
 common_SOURCE = \
 	src/compiledict.cpp \
 	src/dictionary.cpp \
 	src/intonation.cpp \
-	src/klatt.cpp \
 	src/mbrowrap.cpp \
 	src/numbers.cpp \
 	src/readclause.cpp \
 	src/voicedlg.cpp \
 	src/vowelchart.cpp
 
+if OPT_KLATT
+common_FLAGS  += -DINCLUDE_KLATT
+common_SOURCE += src/klatt.cpp
+endif
+
 if AUDIO_RUNTIME
 wave_SOURCE = src/wave.cpp src/wave_pulse.cpp
 wave_LIBS   = -lpulse -lpulse-simple -lportaudio
 lib_LTLIBRARIES += src/libespeak.la
 
 src_libespeak_la_LDFLAGS  = -version-info $(SHARED_VERSION) $(wave_LIBS) -lpthread
-src_libespeak_la_CXXFLAGS = $(wave_FLAGS) \
+src_libespeak_la_CXXFLAGS = $(common_FLAGS) $(wave_FLAGS) \
 	-fpic -fvisibility=hidden -D LIBRARY \
 	-pedantic -fno-exceptions -D PATH_ESPEAK_DATA=\"$(DATADIR)\"
 src_libespeak_la_SOURCES  = $(common_SOURCE) $(libespeak_SOURCE) $(wave_SOURCE)
 bin_PROGRAMS += src/speak
 
 src_speak_LDFLAGS  = $(wave_LIBS) -lpthread
-src_speak_CXXFLAGS = $(wave_FLAGS)
+src_speak_CXXFLAGS = $(common_FLAGS) $(wave_FLAGS)
 src_speak_SOURCES  = src/speak.cpp $(common_SOURCE) $(wave_SOURCE)
 
 bin_PROGRAMS += src/espeak
 bin_PROGRAMS += src/espeakedit
 
 src_espeakedit_LDFLAGS  = $(wave_LIBS) ${WX_LIBS}
-src_espeakedit_CXXFLAGS = ${WX_CXXFLAGS} $(wave_FLAGS) \
+src_espeakedit_CXXFLAGS = ${WX_CXXFLAGS} $(common_FLAGS) $(wave_FLAGS) \
 	-D_LARGEFILE_SOURCE=1 -DNO_GCC_PRAGMA -D_ESPEAKEDIT
 src_espeakedit_SOURCES  = $(common_SOURCE) $(libespeak_SOURCE) $(espeakedit_SOURCE) $(wave_SOURCE)
 

configure.ac

 AM_CONDITIONAL(AUDIO_PORTAUDIO,  [test x"$AUDIO" = xportaudio])
 AM_CONDITIONAL(AUDIO_SADA,       [test x"$AUDIO" = xsada])
 
+dnl ================================================================
+dnl Optional compilation checks.
+dnl ================================================================
+
+AC_ARG_WITH([klatt],
+    [AS_HELP_STRING([--with-klatt], [enable the Klatt formant synthesizer @<:@default=yes@:>@])],
+    [])
+
+if test "$with_klatt" = "no" ; then
+	have_klatt=no
+else
+	have_klatt=yes
+fi
+
+AM_CONDITIONAL(OPT_KLATT, [test x"$have_klatt" = xyes])
+
 dnl ================================================================
 dnl wxWidgets checks.
 dnl ================================================================
 	portaudio:                     ${have_portaudio}
 	sada:                          ${have_sada}
 	audio configuration:           ${AUDIO}
+
+	Klatt:                         ${have_klatt}
 ])

src/klatt.cpp

-
 /***************************************************************************
  *   Copyright (C) 2008 by Jonathan Duddington                             *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2013 Reece H. Dunn                                      *
  *                                                                         *
  *   Based on a re-implementation by:                                      *
  *   (c) 1993,94 Jon Iles and Nick Ing-Simmons                             *
 #include "synthesize.h"
 #include "voice.h"
 
-#ifdef INCLUDE_KLATT    // conditional compilation for the whole file
-
 extern unsigned char *out_ptr;   // **JSD
 extern unsigned char *out_start;
 extern unsigned char *out_end;
 	kt_frame.AVpdb = 0;
 	kt_frame.Gain0 = 62;   // 60
 }  // end of KlattInit
-
-#endif  // INCLUDE_KLATT

src/spectseq.cpp

 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2013 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  *
 #define MAX_HARMONIC  400           // 400 * 50Hz = 20 kHz, more than enough
 
 
+#ifdef INCLUDE_KLATT
 extern void SetSynth_Klatt(int length, int modn, frame_t *fr1, frame_t *fr2, voice_t *v, int control);
 extern int Wavegen_Klatt(int resume);
+extern void KlattReset(int control);
+#endif
 
 extern void SetSynth(int length, int modn, frame_t *fr1, frame_t *fr2, voice_t *v);
 extern int Wavegen();
 extern void CloseWaveFile2();
-extern void KlattReset(int control);
 extern FILE *f_wave;
 
 static int frame_width;
 		out_ptr = out_start = wav_outbuf;
 		out_end = &wav_outbuf[sizeof(wav_outbuf)];
 
+#ifdef INCLUDE_KLATT
 		if(synthesis_method == 1)
 			result = Wavegen_Klatt(resume);
 		else
+#endif
 			result = Wavegen();
 
 		if(f_wave != NULL)
 
 	if(voice->klattv[0])
 	{
+#ifdef INCLUDE_KLATT
 		SetSynth_Klatt((length_mS * samplerate) / 1000, 0, &fr1, &fr2, voice, control);    // convert mS to samples
+#endif
 	}
 	else
 	{
 	if(voice->klattv[0])
 	{
 		synthesizer_type = 1;
+#ifdef INCLUDE_KLATT
 		KlattReset(2);
+#endif
 	}
 
 	SpeakNextClause(NULL,NULL,2);  // stop speaking file
 	if(voice->klattv[0])
 	{
 		synthesizer_type = 1;
+#ifdef INCLUDE_KLATT
 		KlattReset(2);
+#endif
 	}
 
 	SpeakNextClause(NULL,NULL,2);  // stop speaking file

src/speech.h

 /***************************************************************************
  *   Copyright (C) 2005 to 2007 by Jonathan Duddington                     *
  *   email: [email protected]                                    *
+ *   Copyright (C) 2013 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>
 
 // conditional compilation options
-#define INCLUDE_KLATT
 #define INCLUDE_MBROLA
 #define INCLUDE_SONIC