Hook up SQLite in build system, scaffold SQLite repository.

configure

@@ -21,6 +21,7 @@ _build_joystick=yes
 _build_cheats=yes
 _build_png=yes
 _build_zip=yes
+_build_sqlite=no
 _build_static=no
 _build_profile=no
 _build_debug=no
@@ -201,6 +202,8 @@ Optional Features:
   --disable-png
   --enable-zip           enable/disable ZIP file support [enabled]
   --disable-zip
+  --enable-sqlite        enable SQLite for storing settings and preferences [disabled]
+  --disable-sqlite
   --enable-windowed      enable/disable windowed rendering modes [enabled]
   --disable-windowed
   --enable-shared        build shared binary [enabled]
@@ -215,6 +218,7 @@ Optional Libraries:
   --with-sdl-prefix=DIR    Prefix where the sdl2-config script is installed (optional)
   --with-libpng-prefix=DIR Prefix where libpng is installed (optional)
   --with-zlib-prefix=DIR   Prefix where zlib is installed (optional)
+  --with-sqlite-prefix=DIR PREFIX where sqlite is installed (optional)
 
 Some influential environment variables:
   LDFLAGS	linker flags, e.g. -L<lib dir> if you have libraries in a
@@ -243,13 +247,15 @@ for ac_option in $@; do
       --disable-png)            _build_png=no        ;;
       --enable-zip)             _build_zip=yes       ;;
       --disable-zip)            _build_zip=no        ;;
+      --enable-sqlite)          _build_sqlite=yes    ;;
+      --disable-sqlite)         _build_sqlite=no     ;;
       --enable-windowed)        _build_windowed=yes  ;;
       --disable-windowed)       _build_windowed=no   ;;
       --enable-shared)          _build_static=no     ;;
       --enable-static)          _build_static=yes    ;;
       --disable-static)         _build_static=no     ;;
       --enable-profile)         _build_profile=yes   ;;
-      --disable-profile)        _build_profile=no    ;;
+      # --disable-profile)        _build_profile=no    ;;
 			--enable-debug)						_build_debug=yes		 ;;
 			--disable-debug)          _build_debug=false	 ;;
       --with-sdl-prefix=*)
@@ -265,6 +271,11 @@ for ac_option in $@; do
         _prefix=`echo $ac_option | cut -d '=' -f 2`
         ZLIB_CFLAGS="-I$_prefix/include"
         ZLIB_LIBS="-L$_prefix/lib"
+        ;;
+			--with-sqlite-prefix=*)
+        _prefix=`echo $ac_option | cut -d '=' -f 2`
+        SQLITE_CFLAGS="-I$_prefix/include"
+        SQLITE_LIBS="-L$_prefix/lib"
         ;;
       --host=*)
         _host=`echo $ac_option | cut -d '=' -f 2`
@@ -640,6 +651,30 @@ else
   _build_png=no
 fi
 
+#
+# Check for SQLite
+#
+echocheck "SQLite"
+if test "$_build_sqlite" = yes ; then
+	_sqlite=no
+	cat > $TMPC << EOF
+#include <stdio.h>
+#include <sqlite3.h>
+int main(void) { printf("%s\n", SQLITE_VERSION); }
+EOF
+	cc_check $LDFLAGS $CXXFLAGS $SQLITE_CFLAGS $SQLITE_LIBS -lsqlite3 && _sqlite=yes
+
+  if test "$_sqlite" = yes ; then
+    echo "$_sqlite"
+  else
+    echo "disabled"
+    _build_sqlite=no
+  fi
+else
+  echo "disabled"
+  _build_sqlite=no
+fi
+
 #
 # figure out installation directories
 #
@@ -699,6 +734,14 @@ else
 	echo
 fi
 
+if test "$_build_sqlite" = yes ; then
+	echo_n "   SQLite enabled"
+	echo
+else
+	echo_n "   SQLite disabled"
+	echo
+fi
+
 if test "$_build_windowed" = "yes" ; then
 	echo_n "   Windowed rendering modes enabled"
 	echo
@@ -752,6 +795,7 @@ YACC="$SRC/yacc"
 CHEAT="$SRC/cheat"
 LIBPNG="$SRC/libpng"
 ZLIB="$SRC/zlib"
+SQLITE="$SRC/common/repository/sqlite"
 
 INCLUDES="-I$CORE -I$COMMON -I$TV -I$GUI -I$TIA -I$TIA_FRAME_MANAGER"
 
@@ -828,6 +872,12 @@ if test "$_build_png" = yes ; then
   fi
 fi
 
+if test "$_build_sqlite" = yes; then
+	DEFINES="$DEFINES -DSQLITE_SUPPORT"
+	MODULES="$MODULES $SQLITE"
+	INCLUDES="$INCLUDES -I$SQLITE"
+fi
+
 if test "$_build_zip" = yes ; then
 	DEFINES="$DEFINES -DZIP_SUPPORT"
   if test "$_zlib" = yes ; then

src/common/repository/sqlite/KeyValueRepositorySqlite.cxx

@@ -0,0 +1,43 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll
+//  SS  SS   tt           ll   ll
+//  SS     tttttt  eeee   ll   ll   aaaa
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2019 by Bradford W. Mott, Stephen Anthony
+// and the Stella Team
+//
+// See the file "License.txt" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//============================================================================
+
+#include <sqlite3.h>
+
+#include "KeyValueRepositorySqlite.hxx"
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+KeyValueRepositorySqlite::KeyValueRepositorySqlite(
+  const string& databaseDirectory,
+  const string& databaseName
+)
+{}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+KeyValueRepositorySqlite::~KeyValueRepositorySqlite()
+{}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+std::map<string, Variant> KeyValueRepositorySqlite::load()
+{
+  std::map<string, Variant> values;
+
+  return values;
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+void KeyValueRepositorySqlite::save(const std::map<string, Variant>& values)
+{}

src/common/repository/sqlite/KeyValueRepositorySqlite.hxx

@@ -0,0 +1,36 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll
+//  SS  SS   tt           ll   ll
+//  SS     tttttt  eeee   ll   ll   aaaa
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2019 by Bradford W. Mott, Stephen Anthony
+// and the Stella Team
+//
+// See the file "License.txt" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//============================================================================
+
+#ifndef KEY_VALUE_REPOSITORY_SQLITE_HXX
+#define KEY_VALUE_REPOSITORY_SQLITE_HXX
+
+#include "repository/KeyValueRepository.hxx"
+
+class KeyValueRepositorySqlite : public KeyValueRepository
+{
+  public:
+
+    KeyValueRepositorySqlite(const string& databaseDirectory, const string& databaseName);
+
+    ~KeyValueRepositorySqlite();
+
+    virtual std::map<string, Variant> load();
+
+    virtual void save(const std::map<string, Variant>& values);
+};
+
+#endif // KEY_VALUE_REPOSITORY_SQLITE_HXX

src/common/repository/sqlite/module.mk

@@ -0,0 +1,10 @@
+MODULE := src/common/repository/sqlite
+
+MODULE_OBJS := \
+	src/common/repository/sqlite/KeyValueRepositorySqlite.o
+
+MODULE_DIRS += \
+	src/common/repository/sqlite
+
+# Include common rules
+include $(srcdir)/common.rules

src/emucore/OSystem.cxx

@@ -30,6 +30,10 @@
   #include "CheatManager.hxx"
 #endif
 
+#ifdef SQLITE_SUPPORT
+  #include "KeyValueRepositorySqlite.hxx"
+#endif
+
 #include "FSNode.hxx"
 #include "MD5.hxx"
 #include "Cart.hxx"
@@ -746,10 +750,14 @@ void OSystem::mainLoop()
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 shared_ptr<KeyValueRepository> OSystem::createSettingsRepository()
 {
-  if (myConfigFile.empty())
+  #ifdef SQLITE_SUPPORT
-    return make_shared<KeyValueRepositoryNoop>();
+    return make_shared<KeyValueRepositorySqlite>(myBaseDir, "settings");
+  #else
+    if (myConfigFile.empty())
+      return make_shared<KeyValueRepositoryNoop>();
 
-  return make_shared<KeyValueRepositoryConfigfile>(myConfigFile);
+    return make_shared<KeyValueRepositoryConfigfile>(myConfigFile);
+  #endif
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -