Compile support for SQLITE_DBPAGE

https://www.sqlite.org/dbpage.html

Author: flavorjones

ext/sqlite3/extconf.rb

@@ -62,7 +62,8 @@ def configure_packaged_libraries
               "-O2", # see https://github.com/sparklemotion/sqlite3-ruby/issues/335 for some benchmarks
               "-fvisibility=hidden", # see https://github.com/rake-compiler/rake-compiler-dock/issues/87
               "-DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1",
-              "-DSQLITE_USE_URI=1"
+              "-DSQLITE_USE_URI=1",
+              "-DSQLITE_ENABLE_DBPAGE_VTAB=1"
             ]
             env["CFLAGS"] = [user_cflags, env["CFLAGS"], more_cflags].flatten.join(" ")
             recipe.configure_options += env.select { |k, v| ENV_ALLOWLIST.include?(k) }

test/test_database.rb

@@ -721,5 +721,11 @@ def test_transaction_returns_block_result
       result = @db.transaction { :foo }
       assert_equal :foo, result
     end
+
+    def test_sqlite_dbpage_vtab
+      skip("sqlite_dbpage not supported") unless SQLite3::SQLITE_PACKAGED_LIBRARIES
+
+      assert_nothing_raised { @db.execute("select count(*) from sqlite_dbpage") }
+    end
   end
 end