Added configuration options to better control the sqlite3 output.

Still requires cmake -Duse_sqlite=YES to compile in support (and
libsqlite3)

New configuration options available:
- GENERATE_SQLITE3 enable/disable SQLITE3 output
- SQLITE3_OUTPUT configure directory where output is written to
  (default: sqlite3)
- SQLITE3_RECREATE_DB controls if existing database file is overwritten
  (default: YES)

src/config.xml

@@ -3034,28 +3034,35 @@ front of it.
       </docs>
     </option>
   </group>
-<!--
-  <group name='Sqlite3' docs='Configuration options related to Sqlite3 output'>
-    <option type='bool' id='GENERATE_SQLITE3' defval='0'>
+  <group name='Sqlite3' setting='USE_SQLITE3' docs='Configuration options related to Sqlite3 output'>
+    <option type='bool' id='GENERATE_SQLITE3' setting='USE_SQLITE3' defval='0'>
       <docs>
 <![CDATA[
 If the \c GENERATE_SQLITE3 tag is set to \c YES doxygen will generate a
 \c Sqlite3 database with symbols found by doxygen stored in tables.
 ]]>
       </docs>
     </option>
-    <option type='string' id='SQLITE3_OUTPUT' format='dir' defval='sqlite3' depends='GENERATE_SQLITE3'>
+    <option type='string' id='SQLITE3_OUTPUT' format='dir' defval='sqlite3' setting='USE_SQLITE3' depends='GENERATE_SQLITE3'>
       <docs>
 <![CDATA[
 The \c SQLITE3_OUTPUT tag is used to specify where the \c Sqlite3 database will be put.
 If a relative path is entered the value of \ref cfg_output_directory "OUTPUT_DIRECTORY" will be
 put in front of it.
+]]>
+      </docs>
+    </option>
+    <option type='bool' id='SQLITE3_RECREATE_DB' defval='1' setting='USE_SQLITE3' depends='GENERATE_SQLITE3'>
+      <docs>
+<![CDATA[
+The \c SQLITE3_OVERWRITE_DB tag is set to \c YES, the existing doxygen_sqlite3.db
+database file will be recreated with each doxygen run.
+If set to \c NO, doxygen will warn if an a database file is already found and not modify it.
 ]]>
       </docs>
     </option>
 
   </group>
--->
   <group name='PerlMod' docs='Configuration options related to the Perl module output'>
     <option type='bool' id='GENERATE_PERLMOD' defval='0'>
       <docs>

src/configgen.py

@@ -345,6 +345,9 @@ def parseOption(node):
 def parseGroups(node):
 	name = node.getAttribute('name')
 	doc = node.getAttribute('docs')
+	setting = node.getAttribute('setting')
+	if len(setting) > 0:
+		print("#if %s" % (setting))
 	print("%s%s" % ("  //-----------------------------------------",
 					"----------------------------------"))
 	print("  cfg->addInfo(\"%s\",\"%s\");" % (name, doc))
@@ -354,6 +357,8 @@ def parseGroups(node):
 	for n in node.childNodes:
 		if n.nodeType == Node.ELEMENT_NODE:
 			parseOption(n)
+	if len(setting) > 0:
+		print("#endif")
 
 
 def parseGroupMapGetter(node):

src/doxygen.cpp

@@ -10920,13 +10920,15 @@ void parseInput()
     Config_updateString(MAN_OUTPUT,manOutput);
   }
 
-  //QCString sqlOutput;
-  //bool &generateSql = Config_getBool(GENERATE_SQLITE3);
-  //if (generateSql)
-  //{
-  //  sqlOutput = createOutputDirectory(outputDirectory,Config_getString(SQLITE3_OUTPUT),"/sqlite3");
-  //  Config_update(SQLITE3_OUTPUT,sqlOutput);
-  //}
+#if USE_SQLITE3
+  QCString sqlOutput;
+  bool generateSql = Config_getBool(GENERATE_SQLITE3);
+  if (generateSql)
+  {
+    sqlOutput = createOutputDirectory(outputDirectory,Config_getString(SQLITE3_OUTPUT),"/sqlite3");
+    Config_updateString(SQLITE3_OUTPUT,sqlOutput);
+  }
+#endif
 
   if (Config_getBool(HAVE_DOT))
   {
@@ -11543,12 +11545,14 @@ void generateOutput()
     Doxygen::generatingXmlOutput=FALSE;
     g_s.end();
   }
-  if (USE_SQLITE3)
+#if USE_SQLITE3
+  if (Config_getBool(GENERATE_SQLITE3))
   {
     g_s.begin("Generating SQLITE3 output...\n");
     generateSqlite3();
     g_s.end();
   }
+#endif
 
   if (Config_getBool(GENERATE_AUTOGEN_DEF))
   {

src/sqlite3gen.cpp

@@ -2503,11 +2503,10 @@ static void generateSqlite3ForPage(const PageDef *pd,bool isExample)
 static sqlite3* openDbConnection()
 {
 
-  QCString outputDirectory = Config_getString(OUTPUT_DIRECTORY);
+  QCString outputDirectory = Config_getString(SQLITE3_OUTPUT);
   QDir sqlite3Dir(outputDirectory);
   sqlite3 *db;
   int rc;
-  struct stat buf;
 
   rc = sqlite3_initialize();
   if (rc != SQLITE_OK)
@@ -2516,15 +2515,24 @@ static sqlite3* openDbConnection()
     return NULL;
   }
 
+  QCString dbFileName = "doxygen_sqlite3.db";
+  QFileInfo fi(outputDirectory+"/"+dbFileName);
 
-  if (stat (outputDirectory+"/doxygen_sqlite3.db", &buf) == 0)
+  if (fi.exists())
   {
-    err("doxygen_sqlite3.db already exists! Rename, remove, or archive it to regenerate\n");
-    return NULL;
+    if (Config_getBool(SQLITE3_RECREATE_DB))
+    {
+       QDir().remove(fi.absFilePath());
+    }
+    else
+    {
+      err("doxygen_sqlite3.db already exists! Rename, remove, or archive it to regenerate\n");
+      return NULL;
+    }
   }
 
   rc = sqlite3_open_v2(
-    outputDirectory+"/doxygen_sqlite3.db",
+    fi.absFilePath().utf8(),
     &db,
     SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
     0