Fix --disable-jit compilation

* libguile/jit.c: Wrap the whole thing in ENABLE_JIT.
* libguile/threads.c (on_thread_exit):
* libguile/vm.c (scm_call_n):
* libguile/init.c (scm_i_init_guile):
* libguile/vm-engine.c (VM_NAME): Wrap calls into jit.c with ENABLE_JIT.
* configure.ac: Move up AC_CANONICAL_TARGET, as autoconf was complaining
  about it coming after AC_ARG_PROGRAM.
* acinclude.m4 (GUILE_ENABLE_JIT): Fix to honor --enable-jit arg.

acinclude.m4

@@ -581,7 +581,6 @@ AC_DEFUN([GUILE_CONFIG_SCRIPT],[AC_CONFIG_FILES([$1],[chmod +x $1])])
 
 AC_DEFUN([GUILE_ENABLE_JIT], [
   JIT_AVAILABLE=no
-  AC_CANONICAL_TARGET
   AC_MSG_CHECKING([if JIT code generation supported for target CPU])
   case "$target_cpu" in
     i?86|x86_64|amd64)    JIT_AVAILABLE=yes ;;
@@ -611,12 +610,11 @@ AC_DEFUN([GUILE_ENABLE_JIT], [
     [AS_HELP_STRING([--enable-jit[=yes/no/auto]],
                     [enable just-in-time code generation [default=auto]])])
 
-  enable_jit=auto
   AC_MSG_CHECKING([whether to enable JIT code generation])
-  case "$enable_jit" in
-    y*) enable_jit=yes ;;
-    n*) enable_jit=no ;;
-    a*) enable_jit=$JIT_AVAILABLE ;;
+  case "x$enable_jit" in
+    xy*) enable_jit=yes ;;
+    xn*) enable_jit=no ;;
+    xa* | x) enable_jit=$JIT_AVAILABLE ;;
     *)  AC_MSG_ERROR(bad value $enable_jit for --enable-jit) ;;
   esac
   AC_MSG_RESULT($enable_jit)

configure.ac

@@ -31,6 +31,8 @@ AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR(GUILE-VERSION)
 
+AC_CANONICAL_TARGET
+
 dnl Use `serial-tests' so the output `check-guile' is not hidden
 dnl (`parallel-tests' is the default in Automake 1.13.)
 dnl `serial-tests' was introduced in Automake 1.12.

libguile/init.c

@@ -513,7 +513,9 @@ scm_i_init_guile (void *base)
   scm_bootstrap_i18n ();
   scm_init_script ();
   scm_init_unicode ();
+#if ENABLE_JIT
   scm_init_jit ();
+#endif
 
   scm_init_goops ();
 

libguile/jit.c

@@ -22,12 +22,13 @@
 # include <config.h>
 #endif
 
+/* All of this whole file is within an ENABLE_JIT flag.  */
+#if ENABLE_JIT
+
 #include <stdio.h>
 #include <sys/mman.h>
 
-#if ENABLE_JIT
 #include <lightning.h>
-#endif
 
 #include "frames.h"
 #include "gsubr.h"
@@ -4779,3 +4780,5 @@ scm_init_jit (void)
   jit_pause_when_stopping = scm_getenv_int ("GUILE_JIT_PAUSE_WHEN_STOPPING", 0);
   jit_log_level = scm_getenv_int ("GUILE_JIT_LOG", 0);
 }
+
+#endif /* ENABLE_JIT */

libguile/threads.c

@@ -514,7 +514,9 @@ on_thread_exit (void *v)
   t->dynstack.top = NULL;
   t->dynstack.limit = NULL;
   scm_i_vm_free_stack (&t->vm);
+#if ENABLE_JIT
   scm_jit_state_free (t->jit_state);
+#endif
   t->jit_state = NULL;
 
 #ifdef SCM_HAVE_THREAD_STORAGE_CLASS

libguile/vm-engine.c

@@ -458,6 +458,7 @@ VM_NAME (scm_thread *thread)
    */
   VM_DEFINE_OP (5, instrument_entry, "instrument-entry", OP2 (X32, N32))
     {
+#if ENABLE_JIT
       if (!VP->disable_mcode)
         {
           struct scm_jit_function_data *data;
@@ -490,6 +491,7 @@ VM_NAME (scm_thread *thread)
           else
             data->counter += SCM_JIT_COUNTER_ENTRY_INCREMENT;
         }
+#endif
 
       APPLY_HOOK ();
 
@@ -575,6 +577,7 @@ VM_NAME (scm_thread *thread)
       old_fp = VP->fp;
       VP->fp = SCM_FRAME_DYNAMIC_LINK (old_fp);
 
+#if ENABLE_JIT
       if (!VP->disable_mcode)
         {
           mcode = SCM_FRAME_MACHINE_RETURN_ADDRESS (old_fp);
@@ -585,6 +588,7 @@ VM_NAME (scm_thread *thread)
               NEXT (0);
             }
         }
+#endif
 
       ip = SCM_FRAME_VIRTUAL_RETURN_ADDRESS (old_fp);
       NEXT (0);
@@ -699,6 +703,7 @@ VM_NAME (scm_thread *thread)
       SYNC_IP ();
       mcode = CALL_INTRINSIC (compose_continuation, (thread, vmcont));
 
+#if ENABLE_JIT
       if (mcode && !VP->disable_mcode)
         {
           scm_jit_enter_mcode (thread, mcode);
@@ -706,6 +711,7 @@ VM_NAME (scm_thread *thread)
           NEXT (0);
         }
       else
+#endif
         {
           CACHE_REGISTER ();
           NEXT (0);
@@ -721,6 +727,7 @@ VM_NAME (scm_thread *thread)
    */
   VM_DEFINE_OP (14, instrument_loop, "instrument-loop", OP2 (X32, N32))
     {
+#if ENABLE_JIT
       if (!VP->disable_mcode)
         {
           int32_t data_offset = ip[1];
@@ -745,6 +752,7 @@ VM_NAME (scm_thread *thread)
           else
             data->counter += SCM_JIT_COUNTER_LOOP_INCREMENT;
         }
+#endif
 
       NEXT (2);
     }
@@ -789,8 +797,10 @@ VM_NAME (scm_thread *thread)
 
       ABORT_HOOK ();
 
+#if ENABLE_JIT
       if (mcode && !VP->disable_mcode)
         scm_jit_enter_mcode (thread, mcode);
+#endif
 
       CACHE_REGISTER ();
       NEXT (0);

libguile/vm.c

@@ -1588,8 +1588,10 @@ scm_call_n (SCM proc, SCM *argv, size_t nargs)
         /* Non-local return.  */
         if (vp->abort_hook_enabled)
           invoke_abort_hook (thread);
+#if ENABLE_JIT
         if (mcode && !vp->disable_mcode)
           scm_jit_enter_mcode (thread, mcode);
+#endif
       }
     else
       vp->ip = get_callee_vcode (thread);