4 files changed, 27 insertions, 4 deletions
diff --git a/src/ghdldrv/ghdl_gcc.adb b/src/ghdldrv/ghdl_gcc.adb
index c384222be..9077ca36b 100644
--- a/src/ghdldrv/ghdl_gcc.adb
+++ b/src/ghdldrv/ghdl_gcc.adb
@@ -21,6 +21,7 @@ with Ghdldrv;
 with Ghdlprint;
 with Ghdlvpi;
 with Ghdlxml;
+with Ghdlsynth_Maybe;
 
 procedure Ghdl_Gcc is
 begin
@@ -29,6 +30,7 @@ begin
    Ghdlmain.Version_String := new String'("GCC back-end code generator");
    Ghdldrv.Backend := Ghdldrv.Backend_Gcc;
    Ghdldrv.Register_Commands;
+   Ghdlsynth_Maybe.Register_Commands;
    Ghdllocal.Register_Commands;
    Ghdlprint.Register_Commands;
    Ghdlvpi.Register_Commands;
diff --git a/src/ghdldrv/ghdl_jit.adb b/src/ghdldrv/ghdl_jit.adb
index 5da726e10..79d69c0e8 100644
--- a/src/ghdldrv/ghdl_jit.adb
+++ b/src/ghdldrv/ghdl_jit.adb
@@ -21,7 +21,7 @@ with Ghdlprint;
 with Ghdlrun;
 with Ghdlvpi;
 with Ghdlxml;
---  with Ghdlsynth;
+with Ghdlsynth_Maybe;
 with Ortho_Jit;
 
 procedure Ghdl_Jit is
@@ -35,7 +35,7 @@ begin
    Ghdlprint.Register_Commands;
    Ghdlvpi.Register_Commands;
    Ghdlxml.Register_Commands;
-   --  Ghdlsynth.Register_Commands;
+   Ghdlsynth_Maybe.Register_Commands;
    Ghdlmain.Register_Commands;
    Ghdlmain.Main;
 end Ghdl_Jit;
diff --git a/src/ghdldrv/ghdl_simul.adb b/src/ghdldrv/ghdl_simul.adb
index d28be1167..fa95ac5cb 100644
--- a/src/ghdldrv/ghdl_simul.adb
+++ b/src/ghdldrv/ghdl_simul.adb
@@ -21,7 +21,7 @@ with Ghdlprint;
 with Ghdlxml;
 with Ghdlsimul;
 
-with Ghdlsynth;
+with Ghdlsynth_Maybe;
 
 procedure Ghdl_Simul is
 begin
@@ -29,7 +29,7 @@ begin
    --  used to display help).
    Ghdlmain.Version_String := new String'("interpretation");
    Ghdlsimul.Register_Commands;
-   Ghdlsynth.Register_Commands;
+   Ghdlsynth_Maybe.Register_Commands;
    Ghdllocal.Register_Commands;
    Ghdlprint.Register_Commands;
    Ghdlxml.Register_Commands;
diff --git a/src/ghdldrv/ghdlnull.ads b/src/ghdldrv/ghdlnull.ads
new file mode 100644
index 000000000..8a2e8e40c
--- /dev/null
+++ b/src/ghdldrv/ghdlnull.ads
@@ -0,0 +1,21 @@
+--  Null GHDL driver, used to not use synthesis
+--  Copyright (C) 2019 Tristan Gingold
+--
+--  GHDL is free software; you can redistribute it and/or modify it under
+--  the terms of the GNU General Public License as published by the Free
+--  Software Foundation; either version 2, or (at your option) any later
+--  version.
+--
+--  GHDL is distributed in the hope that it will be useful, but WITHOUT ANY
+--  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+--  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+--  for more details.
+--
+--  You should have received a copy of the GNU General Public License
+--  along with GCC; see the file COPYING.  If not, write to the Free
+--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+--  02111-1307, USA.
+
+package Ghdlnull is
+   procedure Register_Commands is null;
+end Ghdlnull;