Update to ECL 16.0.0.
Based on changes from Matthew Mondor as forwarded by Kamil Rytarowski.

Changes since 15.3.7:
 API changes
 - There is no UFFI nickname for FFI package - we piggyback on
   cffi-uffi-compat for UFFI dependent systems (our UFFI wasn't version 2.0
   compatible and there were problems with ADSF dependencies on UFFI - it
   wasn't a system)
 - CLOS has the new nickname "MOP"
 - The new ext:run-program :error argument can automatically create a
   separate stream if provided with the :stream keyword.
   The external-process structure also has a new field to hold that stream.
 - ext:run-program accepts new arguments - :if-input-does-not-exist,
   :if-error-exists and :external-format
 - ext:system no longer binds *standard-input* and *standard-output* and
   now ignores input and output (use ext:run-program for more control)
 - methods can be specialized on both single-float and double-float
   (built-in classes were added for them)
 - LET/FLET/LABELS will signal error if parameter of the same name will
   appear multiple times
 - lambda lists with repeated required parameter name are considered invalid
 - deprecated configure options "--with-system-boehm=x" and
   "--enable-slow-config" removed

 Enhancements:
 - Verification if manual is up-to-date, providing corrections for
   outdated parts
 - Documentation is now included in the main repository under the
   toplevel directory `doc'
 - Update libffi to version 3.2.1
 - Update asdf to version 3.1.5.4
 - Update Boehm-Demers-Weiser garbage collector to version 7.4.2
 - Pathname string-parts internal representation is now character,
   not base-char
 - Dead code removal, tabulators were replaced by spaces
 - Better quality of generated code (explicit casting when necessary)

 Issues fixed:
 - Various fixes of bogus declarations
 - Remove deprecated GC calls
 - ROTATEF, SHIFTF, PSETF reworked to conform to the ANSI standard.
   Places were handled improperly in regard of multiple values.
 - Improved unicode support in character handling
 - Format handles floats and exponentials correctly (major format rework)
 - Stack limits refinements and cleanup, inconsistency and bug fixes
 - Duplicate large block deallocation with GMP 6.0.0a fixed
 - ECL builds on OpenBSD with threads enabled
 - Closures put in mapcar work as expected in both compiled and
   interpreted code
 - Improved readtable-case handling (:invert and character literals now
   conform)
 - Library initialization functions have unique names - no risk of
   clashing symbol names in object files
 - Format float bug fixed, when width and fdigits were not set, but k was
 - `logical-pathname-translations' now throws an error if logical
   pathname wasn't defined yet, to conform with ANSI (it used to return NIL)
 - Wildcards in logical pathname translations are replaced correctly
 - Regression testing framework and unit tests cleanup
 - deftype ANSI conformity fix (deftype accepts macro labda-lists)
 - ECL built with MSVC doesn't crash when Control-C is pressed
 - Other minor tweaks

Changes in 15.3.7 since 15.2.21:
 Issues fixed:
 - DEFUN functions not defined as toplevel forms were also directly
   referenced by other code in the same file.
 - STABLE-SORT works as desired (bogus optimization for strings fixed).
 - broken --with-sse=yes configure flag works once again.

 Enhancements:
 - autoconf scripts are rewritten to support version 2.69 stack.
 - stack direction is now correctly determined, fixing gcc 5.x builds.
 - compilation of ECL under MSVC (2008/2010/2012) even with custom
   code pages.
 - In compiled code it is possible to declare variables to have a C
   type such as in (declare (:double a)) and then the variable is
   enforced to be unboxed to such type.
 - New form FFI:C-PROGN used to interleave C statements with lisp
   code, where the lisp code may refer to any number of variables.
   Example:
       (lambda (i)
         (let* ((limit i)
                (iterator 0))
           (declare (:int limit iterator))
           (ffi:c-progn (limit iterator)
                        "for (#1 = 0; #1 < #0; #1++) {"
                        (print iterator)
                        "}")))

Changes in 15.2.21 since 13.5.1:
 - Features coverity scan model, ffi-unload-module implementation,
   probably more.
 - Build system enhancements, parallel builds, fixes, simplifications,
   cleanups, maintenance.  minor cleanup, maintenance.
 - Numerous fixes.


(asau)

$NetBSD: patch-ac,v 1.1 2015/12/09 21:00:47 asau Exp $

Post-release fix:
commit d077473517d2f5d62a297037b466826b4f0d7d11
check for GC_get_thr_restart_signal only on threaded build

--- src/aclocal.m4.orig
+++ src/aclocal.m4
@@ -935,12 +935,12 @@ if test "${enable_boehm}" = auto -o "${enable_boehm}" = system; then
  dnl Try first with the prebuilt versions, if installed and accessible
  dnl
  system_boehm=yes
- AC_CHECK_LIB( [gc], [GC_get_thr_restart_signal],
-               [], [system_boehm="no"] )
  if test "${enable_threads}" = no; then
    AC_CHECK_LIB( [gc], [GC_malloc],
                  [], [system_boehm="no"] )
  else
+   AC_CHECK_LIB( [gc], [GC_get_thr_restart_signal],
+                 [], [system_boehm="no"] )
    AC_CHECK_LIB( [gc], [GC_register_my_thread],
                  [], [system_boehm="no"] )
  fi
--- src/configure.orig
+++ src/configure
@@ -5841,9 +5841,10 @@ case "${enable_boehm}" in
 esac
 if test "${enable_boehm}" = auto -o "${enable_boehm}" = system; then
     system_boehm=yes
- { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GC_get_thr_restart_signal in -lgc" >&5
-$as_echo_n "checking for GC_get_thr_restart_signal in -lgc... " >&6; }
-if ${ac_cv_lib_gc_GC_get_thr_restart_signal+:} false; then :
+ if test "${enable_threads}" = no; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GC_malloc in -lgc" >&5
+$as_echo_n "checking for GC_malloc in -lgc... " >&6; }
+if ${ac_cv_lib_gc_GC_malloc+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5857,27 +5858,27 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 #ifdef __cplusplus
 extern "C"
 #endif
-char GC_get_thr_restart_signal ();
+char GC_malloc ();
 int
 main ()
 {
-return GC_get_thr_restart_signal ();
+return GC_malloc ();
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_gc_GC_get_thr_restart_signal=yes
+  ac_cv_lib_gc_GC_malloc=yes
 else
-  ac_cv_lib_gc_GC_get_thr_restart_signal=no
+  ac_cv_lib_gc_GC_malloc=no
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 LIBS=$ac_check_lib_save_LIBS
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gc_GC_get_thr_restart_signal" >&5
-$as_echo "$ac_cv_lib_gc_GC_get_thr_restart_signal" >&6; }
-if test "x$ac_cv_lib_gc_GC_get_thr_restart_signal" = xyes; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gc_GC_malloc" >&5
+$as_echo "$ac_cv_lib_gc_GC_malloc" >&6; }
+if test "x$ac_cv_lib_gc_GC_malloc" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBGC 1
 _ACEOF
@@ -5888,10 +5889,10 @@ else
   system_boehm="no"
 fi
 
- if test "${enable_threads}" = no; then
-   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GC_malloc in -lgc" >&5
-$as_echo_n "checking for GC_malloc in -lgc... " >&6; }
-if ${ac_cv_lib_gc_GC_malloc+:} false; then :
+ else
+   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GC_get_thr_restart_signal in -lgc" >&5
+$as_echo_n "checking for GC_get_thr_restart_signal in -lgc... " >&6; }
+if ${ac_cv_lib_gc_GC_get_thr_restart_signal+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   ac_check_lib_save_LIBS=$LIBS
@@ -5905,27 +5906,27 @@ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 #ifdef __cplusplus
 extern "C"
 #endif
-char GC_malloc ();
+char GC_get_thr_restart_signal ();
 int
 main ()
 {
-return GC_malloc ();
+return GC_get_thr_restart_signal ();
   ;
   return 0;
 }
 _ACEOF
 if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_lib_gc_GC_malloc=yes
+  ac_cv_lib_gc_GC_get_thr_restart_signal=yes
 else
-  ac_cv_lib_gc_GC_malloc=no
+  ac_cv_lib_gc_GC_get_thr_restart_signal=no
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 LIBS=$ac_check_lib_save_LIBS
 fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gc_GC_malloc" >&5
-$as_echo "$ac_cv_lib_gc_GC_malloc" >&6; }
-if test "x$ac_cv_lib_gc_GC_malloc" = xyes; then :
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_gc_GC_get_thr_restart_signal" >&5
+$as_echo "$ac_cv_lib_gc_GC_get_thr_restart_signal" >&6; }
+if test "x$ac_cv_lib_gc_GC_get_thr_restart_signal" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_LIBGC 1
 _ACEOF
@@ -5936,7 +5937,6 @@ else
   system_boehm="no"
 fi
 
- else
    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GC_register_my_thread in -lgc" >&5
 $as_echo_n "checking for GC_register_my_thread in -lgc... " >&6; }
 if ${ac_cv_lib_gc_GC_register_my_thread+:} false; then :