Autogen should refresh src/Makefile.in from src/Makefile.{def,tpl}
at build time, but we do not want to Build-Depend: guile.
# export QUILT_PATCHES=debian/patches
# quilt pop $this.diff
# quilt add src/Makefile.in
# (cd src && autogen Makefile.def)
# quilt refresh --no-timestamps --no-index -pab
# quilt push -a

--- /dev/null
+++ b/src/libada-sjlj/Makefile.in
@@ -0,0 +1,204 @@
+# Makefile for libada.
+#   Copyright (C) 2003-2017 Free Software Foundation, Inc.
+#
+# This file 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 3 of the License, or
+# (at your option) any later version.
+# 
+# This program 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 this program; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+# Default target; must be first.
+all: gnatlib
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=all multi-do # $(MAKE)
+
+.PHONY: all
+
+## Multilib support variables.
+MULTISRCTOP =
+MULTIBUILDTOP =
+MULTIDIRS =
+MULTISUBDIR =
+MULTIDO = true
+MULTICLEAN = true
+
+# Standard autoconf-set variables.
+SHELL = @SHELL@
+srcdir = @srcdir@
+libdir = @libdir@
+build = @build@
+target = @target@
+prefix = @prefix@
+
+# Nonstandard autoconf-set variables.
+enable_shared = @enable_shared@
+
+LN_S=@LN_S@
+AWK=@AWK@
+
+ifeq (cp -p,$(LN_S))
+LN_S_RECURSIVE = cp -pR
+else
+LN_S_RECURSIVE = $(LN_S)
+endif
+
+# Variables for the user (or the top level) to override.
+objext=.o
+THREAD_KIND=native
+TRACE=no
+LDFLAGS=
+
+# The tedious process of getting CFLAGS right.
+CFLAGS=-g
+PICFLAG = @PICFLAG@
+GNATLIBFLAGS= -W -Wall -gnatpg -nostdinc
+GNATLIBCFLAGS= -g -O2
+GNATLIBCFLAGS_FOR_C = -W -Wall $(GNATLIBCFLAGS) $(CFLAGS_FOR_TARGET) \
+	-fexceptions -DIN_RTS @have_getipinfo@ @have_capability@
+
+host_subdir = @host_subdir@
+GCC_DIR=$(MULTIBUILDTOP)../../$(host_subdir)/gcc
+
+target_noncanonical:=@target_noncanonical@
+version := $(shell @get_gcc_base_ver@ $(srcdir)/../gcc/BASE-VER)
+libsubdir := $(libdir)/gcc/$(target_noncanonical)/$(version)$(MULTISUBDIR)
+ADA_RTS_DIR=$(GCC_DIR)/ada/rts$(subst /,_,$(MULTISUBDIR))
+ADA_RTS_SUBDIR=./rts$(subst /,_,$(MULTISUBDIR))
+
+# exeext should not be used because it's the *host* exeext.  We're building
+# a *target* library, aren't we?!?  Likewise for CC.  Still, provide bogus
+# definitions just in case something slips through the safety net provided
+# by recursive make invocations in gcc/ada/Makefile.in
+LIBADA_FLAGS_TO_PASS = \
+        "MAKEOVERRIDES=" \
+        "LDFLAGS=$(LDFLAGS) -Wl,--no-allow-shlib-undefined \
+          -Wl,--no-copy-dt-needed-entries -Wl,--no-undefined" \
+        "LN_S=$(LN_S)" \
+        "SHELL=$(SHELL)" \
+        "GNATLIBFLAGS=$(GNATLIBFLAGS) $(MULTIFLAGS) -gnatn" \
+        "GNATLIBCFLAGS=$(GNATLIBCFLAGS) $(MULTIFLAGS)" \
+        "GNATLIBCFLAGS_FOR_C=$(GNATLIBCFLAGS_FOR_C) $(MULTIFLAGS)" \
+        "PICFLAG_FOR_TARGET=$(PICFLAG)" \
+        "THREAD_KIND=$(THREAD_KIND)" \
+        "TRACE=$(TRACE)" \
+        "MULTISUBDIR=$(MULTISUBDIR)" \
+        "libsubdir=$(libsubdir)" \
+        "objext=$(objext)" \
+        "prefix=$(prefix)" \
+        "exeext=.exeext.should.not.be.used " \
+	'CC=the.host.compiler.should.not.be.needed' \
+	"GCC_FOR_TARGET=$(CC)" \
+        "CFLAGS=$(CFLAGS)" \
+	"RTSDIR=rts-sjlj"
+
+# Rules to build gnatlib.
+.PHONY: gnatlib gnatlib-plain gnatlib-sjlj gnatlib-zcx gnatlib-shared osconstool
+gnatlib: gnatlib-sjlj
+
+gnatlib-plain: osconstool $(GCC_DIR)/ada/Makefile
+	test -f stamp-libada || \
+	$(MAKE) -C $(GCC_DIR)/ada $(LIBADA_FLAGS_TO_PASS) gnatlib \
+	&& touch stamp-libada
+	-rm -rf adainclude
+	-rm -rf adalib
+	$(LN_S_RECURSIVE) $(ADA_RTS_DIR) adainclude
+	$(LN_S_RECURSIVE) $(ADA_RTS_DIR) adalib
+
+gnatlib-sjlj gnatlib-zcx gnatlib-shared: osconstool $(GCC_DIR)/ada/Makefile
+	test -f stamp-libada || \
+	$(MAKE) -C $(GCC_DIR)/ada $(LIBADA_FLAGS_TO_PASS) $@ \
+	&& touch stamp-libada-sjlj
+	-rm -rf adainclude
+	-rm -rf adalib
+	$(LN_S_RECURSIVE) $(ADA_RTS_DIR) adainclude
+	$(LN_S_RECURSIVE) $(ADA_RTS_DIR) adalib
+
+osconstool:
+	$(MAKE) -C $(GCC_DIR)/ada $(LIBADA_FLAGS_TO_PASS) ./bldtools/oscons/xoscons
+
+install-gnatlib: $(GCC_DIR)/ada/Makefile
+	$(MAKE) -C $(GCC_DIR)/ada $(LIBADA_FLAGS_TO_PASS) install-gnatlib-sjlj
+
+# Check uninstalled version.
+check:
+
+# Check installed version.
+installcheck:
+
+# Build info (none here).
+info:
+
+# Build DVI (none here).
+dvi:
+
+# Build PDF (none here).
+pdf:
+
+# Build html (none here).
+html:
+
+# Build TAGS (none here).
+TAGS:
+
+.PHONY: check installcheck info dvi pdf html
+
+# Installation rules.
+install: install-gnatlib
+	$(MULTIDO) $(AM_MAKEFLAGS) DO=install multi-do # $(MAKE)
+
+install-strip: install
+
+install-info:
+
+install-pdf:
+
+install-html:
+
+.PHONY: install install-strip install-info install-pdf install-html
+
+# Cleaning rules.
+mostlyclean:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=mostlyclean multi-clean # $(MAKE)
+
+clean:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=clean multi-clean # $(MAKE)
+
+distclean:
+	$(MULTICLEAN) $(AM_MAKEFLAGS) DO=distclean multi-clean # $(MAKE)
+	$(RM) Makefile config.status config.log
+
+maintainer-clean:
+
+.PHONY: mostlyclean clean distclean maintainer-clean
+
+# Rules for rebuilding this Makefile.
+Makefile: $(srcdir)/Makefile.in config.status
+	CONFIG_FILES=$@ ; \
+	CONFIG_HEADERS= ; \
+	$(SHELL) ./config.status
+
+config.status: $(srcdir)/configure
+	$(SHELL) ./config.status --recheck
+
+AUTOCONF = autoconf
+configure_deps = \
+	$(srcdir)/configure.ac \
+	$(srcdir)/../config/acx.m4 \
+	$(srcdir)/../config/multi.m4 \
+	$(srcdir)/../config/override.m4 \
+	$(srcdir)/../config/picflag.m4 \
+	$(srcdir)/../config/unwind_ipinfo.m4
+
+$(srcdir)/configure: @MAINT@ $(configure_deps)
+	cd $(srcdir) && $(AUTOCONF)
+
+# Don't export variables to the environment, in order to not confuse
+# configure.
+.NOEXPORT:
--- /dev/null
+++ b/src/libada-sjlj/configure.ac
@@ -0,0 +1,156 @@
+# Configure script for libada.
+#   Copyright (C) 2003-2017 Free Software Foundation, Inc.
+#
+# This file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.
+
+sinclude(../config/acx.m4)
+sinclude(../config/multi.m4)
+sinclude(../config/override.m4)
+sinclude(../config/picflag.m4)
+sinclude(../config/unwind_ipinfo.m4)
+
+AC_INIT
+AC_PREREQ([2.64])
+
+AC_CONFIG_SRCDIR([Makefile.in])
+
+# Determine the host, build, and target systems
+AC_CANONICAL_BUILD
+AC_CANONICAL_HOST
+AC_CANONICAL_TARGET
+target_alias=${target_alias-$host_alias}
+
+# Determine the noncanonical target name, for directory use.
+ACX_NONCANONICAL_TARGET
+
+# Determine the target- and build-specific subdirectories
+GCC_TOPLEV_SUBDIRS
+
+# Command-line options.
+# Very limited version of AC_MAINTAINER_MODE.
+AC_ARG_ENABLE([maintainer-mode],
+  [AC_HELP_STRING([--enable-maintainer-mode],
+                 [enable make rules and dependencies not useful (and
+                  sometimes confusing) to the casual installer])],
+  [case ${enable_maintainer_mode} in
+     yes) MAINT='' ;;
+     no) MAINT='#' ;;
+     *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
+   esac
+   maintainer_mode=${enableval}],
+  [MAINT='#'])
+AC_SUBST([MAINT])dnl
+
+AM_ENABLE_MULTILIB(, ..)
+# Calculate toolexeclibdir
+# Also toolexecdir, though it's only used in toolexeclibdir
+case ${enable_version_specific_runtime_libs} in
+  yes)
+    # Need the gcc compiler version to know where to install libraries
+    # and header files if --enable-version-specific-runtime-libs option
+    # is selected.
+    toolexecdir='$(libdir)/gcc/$(target_alias)'
+    toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
+    ;;
+  no)
+    if test -n "$with_cross_host" &&
+       test x"$with_cross_host" != x"no"; then
+      # Install a library built with a cross compiler in tooldir, not libdir.
+      toolexecdir='$(exec_prefix)/$(target_alias)'
+      toolexeclibdir='$(toolexecdir)/lib'
+    else
+      toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
+      toolexeclibdir='$(libdir)'
+    fi
+    multi_os_directory=`$CC -print-multi-os-directory`
+    case $multi_os_directory in
+      .) ;; # Avoid trailing /.
+      *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
+    esac
+    ;;
+esac
+AC_SUBST(toolexecdir)
+AC_SUBST(toolexeclibdir)
+#TODO: toolexeclibdir is currently disregarded
+
+# Check the compiler.
+# The same as in boehm-gc and libstdc++. Have to borrow it from there.
+# We must force CC to /not/ be precious variables; otherwise
+# the wrong, non-multilib-adjusted value will be used in multilibs.
+# As a side effect, we have to subst CFLAGS ourselves.
+
+m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
+m4_define([_AC_ARG_VAR_PRECIOUS],[])
+AC_PROG_CC
+m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
+
+AC_SUBST(CFLAGS)
+
+AC_ARG_ENABLE([shared],
+[AC_HELP_STRING([--disable-shared],
+                [don't provide a shared libgnat])],
+[
+case $enable_shared in
+  yes | no) ;;
+  *)
+    enable_shared=no
+    IFS="${IFS=         }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
+    for pkg in $enableval; do
+      case $pkg in
+        ada | libada)
+          enable_shared=yes ;;
+      esac
+    done
+    IFS="$ac_save_ifs"
+    ;;
+esac
+], [enable_shared=yes])
+AC_SUBST([enable_shared])
+
+GCC_PICFLAG
+AC_SUBST([PICFLAG])
+
+# These must be passed down, or are needed by gcc/libgcc.mvars
+AC_PROG_AWK
+AC_PROG_LN_S
+
+# Determine what to build for 'gnatlib'
+if test ${enable_shared} = yes; then
+  default_gnatlib_target="gnatlib-shared"
+else
+  default_gnatlib_target="gnatlib-plain"
+fi
+AC_SUBST([default_gnatlib_target])
+
+# Check for _Unwind_GetIPInfo
+GCC_CHECK_UNWIND_GETIPINFO
+if test x$have_unwind_getipinfo = xyes; then
+  have_getipinfo=-DHAVE_GETIPINFO
+else
+  have_getipinfo=
+fi
+AC_SUBST([have_getipinfo])
+
+# Check for <sys/capability.h>
+AC_CHECK_HEADER([sys/capability.h], have_capability=-DHAVE_CAPABILITY, have_capability=)
+AC_SUBST([have_capability])
+
+# Determine what GCC version number to use in filesystem paths.
+GCC_BASE_VER
+
+# Output: create a Makefile.
+AC_CONFIG_FILES([Makefile])
+
+AC_OUTPUT
--- a/src/Makefile.def
+++ b/src/Makefile.def
@@ -194,6 +194,7 @@ target_modules = { module= libgnatvsn; n
 		   missing= TAGS;
 		   missing= install-info;
 		   missing= installcheck; };
+target_modules = { module= libada-sjlj; };
 target_modules = { module= libgomp; bootstrap= true; lib_path=.libs; };
 target_modules = { module= libitm; lib_path=.libs; };
 target_modules = { module= libatomic; lib_path=.libs; };
@@ -394,6 +395,7 @@ dependencies = { module=all-libcpp; on=a
 dependencies = { module=all-fixincludes; on=all-libiberty; };
 
 dependencies = { module=all-target-libada; on=all-gcc; };
+dependencies = { module=all-target-libada-sjlj; on=all-target-libada; };
 dependencies = { module=all-gnattools; on=all-target-libada; };
 dependencies = { module=all-gnattools; on=all-target-libstdc++-v3; };
 dependencies = { module=all-gnattools; on=all-target-libgnat_util; };
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -167,6 +167,7 @@ target_libraries="target-libgcc \
 		target-libffi \
 		target-libobjc \
 		target-libada \
+		target-libada-sjlj \
 		${target_libiberty} \
 		target-libgnat_util \
 		target-libgo \
@@ -454,7 +455,7 @@ AC_ARG_ENABLE(libada,
 ENABLE_LIBADA=$enableval,
 ENABLE_LIBADA=yes)
 if test "${ENABLE_LIBADA}" != "yes" ; then
-  noconfigdirs="$noconfigdirs target-libgnat_util gnattools"
+  noconfigdirs="$noconfigdirs target-libgnat_util gnattools target-libada-sjlj"
 fi
 
 AC_ARG_ENABLE(libssp,
--- a/src/gcc/ada/gcc-interface/Makefile.in
+++ b/src/gcc/ada/gcc-interface/Makefile.in
@@ -193,7 +193,7 @@ GNAT_SRC=$(fsrcpfx)ada
 
 # Multilib handling
 MULTISUBDIR =
-RTSDIR = rts$(subst /,_,$(MULTISUBDIR))
+RTSDIR := rts$(subst /,_,$(MULTISUBDIR))
 
 # Link flags used to build gnat tools.  By default we prefer to statically
 # link with libgcc to avoid a dependency on shared libgcc (which is tricky
@@ -561,6 +561,26 @@ install-gnatlib: ../stamp-gnatlib-$(RTSD
 	cd $(DESTDIR)$(ADA_INCLUDE_DIR); $(CHMOD) a-wx *.adb
 	cd $(DESTDIR)$(ADA_INCLUDE_DIR); $(CHMOD) a-wx *.ads
 
+install-gnatlib-sjlj: ../stamp-gnatlib-$(RTSDIR)
+#	Create the directory before deleting it, in case the directory is
+#	a list of directories (as it may be on VMS). This ensures we are
+#	deleting the right one.
+	-$(MKDIR) $(DESTDIR)$(ADA_RTL_OBJ_DIR_SJLJ)
+	-$(MKDIR) $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ)
+	$(RMDIR) $(DESTDIR)$(ADA_RTL_OBJ_DIR_SJLJ)
+	$(RMDIR) $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ)
+	-$(MKDIR) $(DESTDIR)$(ADA_RTL_OBJ_DIR_SJLJ)
+	-$(MKDIR) $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ)
+	for file in $(RTSDIR)/*.ali; do \
+	    $(INSTALL_DATA_DATE) $$file $(DESTDIR)$(ADA_RTL_OBJ_DIR_SJLJ); \
+	done
+	# This copy must be done preserving the date on the original file.
+	for file in $(RTSDIR)/*.ad?; do \
+	    $(INSTALL_DATA_DATE) $$file $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ); \
+	done
+	cd $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ); $(CHMOD) a-wx *.adb
+	cd $(DESTDIR)$(ADA_INCLUDE_DIR_SJLJ); $(CHMOD) a-wx *.ads
+
 ../stamp-gnatlib2-$(RTSDIR):
 	$(RM) $(RTSDIR)/s-*.ali
 	$(RM) $(RTSDIR)/s-*$(objext)
@@ -826,6 +846,7 @@ gnatlib-shared:
 gnatlib-sjlj:
 	$(MAKE) $(FLAGS_TO_PASS) \
 	     EH_MECHANISM="" \
+	     RTSDIR="$(RTSDIR)" \
 	     MULTISUBDIR="$(MULTISUBDIR)" \
 	     THREAD_KIND="$(THREAD_KIND)" \
 	     ../stamp-gnatlib1-$(RTSDIR)
@@ -835,6 +856,7 @@ gnatlib-sjlj:
 	  $(RTSDIR)/system.ads > $(RTSDIR)/s.ads
 	$(MV) $(RTSDIR)/s.ads $(RTSDIR)/system.ads
 	$(MAKE) $(FLAGS_TO_PASS) \
+	     RTSDIR="$(RTSDIR)" \
 	     EH_MECHANISM="" \
 	     GNATLIBFLAGS="$(GNATLIBFLAGS)" \
 	     GNATLIBCFLAGS="$(GNATLIBCFLAGS)" \
@@ -889,6 +911,8 @@ b_gnatm.o : b_gnatm.adb
 
 ADA_INCLUDE_DIR = $(libsubdir)/adainclude
 ADA_RTL_OBJ_DIR = $(libsubdir)/adalib
+ADA_INCLUDE_DIR_SJLJ = $(libsubdir)/rts-sjlj/adainclude
+ADA_RTL_OBJ_DIR_SJLJ = $(libsubdir)/rts-sjlj/adalib
 
 # Special flags
 
--- a/src/gcc/ada/gcc-interface/config-lang.in
+++ b/src/gcc/ada/gcc-interface/config-lang.in
@@ -43,8 +43,8 @@ if test "x$cross_compiling/$build/$host"
   lang_requires="c c++"
 fi
 
-target_libs="target-libada target-libgnat_util"
-lang_dirs="libada gnattools"
+target_libs="target-libada target-libgnat_util target-libada-sjlj"
+lang_dirs="libada gnattools libada-sjlj"
 
 # Ada is not enabled by default for the time being.
 build_by_default=no
--- a/src/gcc/ada/gcc-interface/Make-lang.in
+++ b/src/gcc/ada/gcc-interface/Make-lang.in
@@ -837,6 +837,7 @@ ada.install-common:
 
 install-gnatlib:
 	$(MAKE) -C ada $(COMMON_FLAGS_TO_PASS) $(ADA_FLAGS_TO_PASS) install-gnatlib$(LIBGNAT_TARGET)
+	$(MAKE) -C ada $(COMMON_FLAGS_TO_PASS) $(ADA_FLAGS_TO_PASS) RTSDIR="rts-sjlj" install-gnatlib-sjlj$(LIBGNAT_TARGET)
 
 install-gnatlib-obj:
 	$(MAKE) -C ada $(COMMON_FLAGS_TO_PASS) $(ADA_FLAGS_TO_PASS) install-gnatlib-obj
