diff -Naur lazarus.orig/ide/compileroptionsdlg.pp lazarus/ide/compileroptionsdlg.pp
--- lazarus.orig/ide/compileroptionsdlg.pp	2007-11-02 22:22:06 +0300
+++ lazarus/ide/compileroptionsdlg.pp	2007-12-14 14:09:11 +0300
@@ -1159,8 +1159,8 @@
 
   grpGenerate.Caption := dlgCOGenerate;
   radGenNormal.Caption := dlgCONormal+' (none)';
-  radGenFaster.Caption := dlgCOFast+' (-OG)';
-  radGenSmaller.Caption := dlgCOSmaller+' (-Og)';
+  radGenFaster.Caption := dlgCOFast+' (-O1)';
+  radGenSmaller.Caption := dlgCOSmaller+' (-Os)';
 
   grpTargetPlatform.Caption := dlgTargetPlatform;
   lblTargetOS.Caption := dlgTargetOS+' (-T)';
diff -Naur lazarus.orig/ide/compileroptions.pp lazarus/ide/compileroptions.pp
--- lazarus.orig/ide/compileroptions.pp	2007-09-22 02:04:19 +0400
+++ lazarus/ide/compileroptions.pp	2007-12-14 14:05:52 +0300
@@ -1982,8 +1982,8 @@
   { Generate    G = faster g = smaller  }
   case (Generate) of
     cgcNormalCode: ;
-    cgcFasterCode:  OptimizeSwitches := OptimizeSwitches + 'G';
-    cgcSmallerCode:  OptimizeSwitches := OptimizeSwitches + 'g';
+    cgcFasterCode:  OptimizeSwitches := OptimizeSwitches + '1';
+    cgcSmallerCode:  OptimizeSwitches := OptimizeSwitches + 's';
   end;
 
   { OptimizationLevel     1 = Level 1    2 = Level 2    3 = Level 3 }