Use SQLITE_OPEN_EXRESCODE when available

Author: groue

GRDB/Core/Configuration.swift

@@ -296,8 +296,11 @@ public struct Configuration {
     var SQLiteConnectionWillClose: ((SQLiteConnection) -> Void)?
     var SQLiteConnectionDidClose: (() -> Void)?
     var SQLiteOpenFlags: CInt {
-        let readWriteFlags = readonly ? SQLITE_OPEN_READONLY : (SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE)
-        return threadingMode.SQLiteOpenFlags | readWriteFlags
+        var flags = readonly ? SQLITE_OPEN_READONLY : (SQLITE_OPEN_CREATE | SQLITE_OPEN_READWRITE)
+        if sqlite3_libversion_number() >= 3037000 {
+            flags |= 0x02000000 // SQLITE_OPEN_EXRESCODE
+        }
+        return threadingMode.SQLiteOpenFlags | flags
     }
 
     func setUp(_ db: Database) throws {

GRDB/Core/Database.swift

@@ -347,6 +347,10 @@ public final class Database: CustomStringConvertible, CustomDebugStringConvertib
     }
 
     private func activateExtendedCodes() throws {
+        if (configuration.SQLiteOpenFlags & 0x02000000 /* SQLITE_OPEN_EXRESCODE */) != 0 {
+            // Nothing to do
+            return
+        }
         let code = sqlite3_extended_result_codes(sqliteConnection, 1)
         guard code == SQLITE_OK else {
             throw DatabaseError(resultCode: code, message: String(cString: sqlite3_errmsg(sqliteConnection)))