3 files changed, 28 insertions, 18 deletions
diff --git a/src/ghdldrv/ghdlsimul.adb b/src/ghdldrv/ghdlsimul.adb
index e0a5ce649..2e304d7ce 100644
--- a/src/ghdldrv/ghdlsimul.adb
+++ b/src/ghdldrv/ghdlsimul.adb
@@ -141,6 +141,9 @@ package body Ghdlsimul is
       Grt.Options.Progname := Grt.Types.To_Ghdl_C_String (Argv0.all'Address);
       Grt.Errors.Set_Error_Stream (Grt.Stdio.stdout);
 
+      Grtlink.Flag_String := Flags.Flag_String;
+      Grt.Options.Set_Time_Resolution;
+
       for I in Args'Range loop
          Arg := Args (I);
          if Arg.all = "--disp-tree" then
@@ -187,8 +190,6 @@ package body Ghdlsimul is
          return;
       end if;
 
-      Grtlink.Flag_String := Flags.Flag_String;
-
       Simul.Simulation.Main.Simulation_Entity (Top_Conf);
 
       Set_Exit_Status (Exit_Status (Grt.Errors.Exit_Status));
diff --git a/src/grt/grt-options.adb b/src/grt/grt-options.adb
index d93ad9e58..e19d491ca 100644
--- a/src/grt/grt-options.adb
+++ b/src/grt/grt-options.adb
@@ -32,6 +32,26 @@ with Grt.Wave_Opt.File;
 
 package body Grt.Options is
 
+   procedure Set_Time_Resolution is
+   begin
+      case Flag_String (5) is
+         when 'f' | '-' =>
+            Time_Resolution_Scale := 5;
+         when 'p' =>
+            Time_Resolution_Scale := 4;
+         when 'n' =>
+            Time_Resolution_Scale := 3;
+         when 'u' =>
+            Time_Resolution_Scale := 2;
+         when 'm' =>
+            Time_Resolution_Scale := 1;
+         when 's' =>
+            Time_Resolution_Scale := 0;
+         when others =>
+            Error ("unhandled time resolution");
+      end case;
+   end Set_Time_Resolution;
+
    procedure Help
    is
       use Grt.Astdio;
@@ -384,22 +404,8 @@ package body Grt.Options is
       Len : Natural;
       Status : Decode_Option_Status;
    begin
-      case Flag_String (5) is
-         when 'f' | '-' =>
-            Time_Resolution_Scale := 5;
-         when 'p' =>
-            Time_Resolution_Scale := 4;
-         when 'n' =>
-            Time_Resolution_Scale := 3;
-         when 'u' =>
-            Time_Resolution_Scale := 2;
-         when 'm' =>
-            Time_Resolution_Scale := 1;
-         when 's' =>
-            Time_Resolution_Scale := 0;
-         when others =>
-            Error ("unhandled time resolution");
-      end case;
+      --  Must be done before decoding options.
+      Set_Time_Resolution;
 
       Stop := False;
       Last_Opt := Argc - 1;
diff --git a/src/grt/grt-options.ads b/src/grt/grt-options.ads
index fa7e1f660..32852d650 100644
--- a/src/grt/grt-options.ads
+++ b/src/grt/grt-options.ads
@@ -65,6 +65,9 @@ package Grt.Options is
    subtype Natural_Time_Scale is Natural range 0 .. 5;
    Time_Resolution_Scale : Natural_Time_Scale;
 
+   --  Set Time_Resolution_Scale from Flag_String.
+   procedure Set_Time_Resolution;
+
    --  Display options help.
    --  Should not be called directly.
    procedure Help;