diff --git a/polly/lib/External/isl/GIT_HEAD_ID b/polly/lib/External/isl/GIT_HEAD_ID
index b50c79479b513..82e1cd3784ab2 100644
--- a/polly/lib/External/isl/GIT_HEAD_ID
+++ b/polly/lib/External/isl/GIT_HEAD_ID
@@ -1 +1 @@
-isl-0.18-768-g033b61ae
+isl-0.18-791-ga22eb92
diff --git a/polly/lib/External/isl/config.guess b/polly/lib/External/isl/config.guess
index 2e9ad7fe8189d..0967f2afa92a8 100755
--- a/polly/lib/External/isl/config.guess
+++ b/polly/lib/External/isl/config.guess
@@ -2,7 +2,7 @@
 # Attempt to guess a canonical system name.
 #   Copyright 1992-2016 Free Software Foundation, Inc.
 
-timestamp='2016-10-02'
+timestamp='2016-04-02'
 
 # 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
@@ -186,12 +186,9 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	    *) machine=${UNAME_MACHINE_ARCH}-unknown ;;
 	esac
 	# The Operating System including object format, if it has switched
-	# to ELF recently (or will in the future) and ABI.
+	# to ELF recently, or will in the future.
 	case "${UNAME_MACHINE_ARCH}" in
-	    earm*)
-		os=netbsdelf
-		;;
-	    arm*|i386|m68k|ns32k|sh3*|sparc|vax)
+	    arm*|earm*|i386|m68k|ns32k|sh3*|sparc|vax)
 		eval $set_cc_for_build
 		if echo __ELF__ | $CC_FOR_BUILD -E - 2>/dev/null \
 			| grep -q __ELF__
@@ -1000,9 +997,6 @@ EOF
 	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
 	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-${LIBC}"; exit; }
 	;;
-    mips64el:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
-	exit ;;
     openrisc*:Linux:*:*)
 	echo or1k-unknown-linux-${LIBC}
 	exit ;;
@@ -1035,9 +1029,6 @@ EOF
     ppcle:Linux:*:*)
 	echo powerpcle-unknown-linux-${LIBC}
 	exit ;;
-    riscv32:Linux:*:* | riscv64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
-	exit ;;
     s390:Linux:*:* | s390x:Linux:*:*)
 	echo ${UNAME_MACHINE}-ibm-linux-${LIBC}
 	exit ;;
@@ -1417,17 +1408,18 @@ esac
 cat >&2 <<EOF
 $0: unable to guess system type
 
-This script (version $timestamp), has failed to recognize the
-operating system you are using. If your script is old, overwrite
-config.guess and config.sub with the latest versions from:
+This script, last modified $timestamp, has failed to recognize
+the operating system you are using. It is advised that you
+download the most up to date version of the config scripts from
 
   http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess
 and
   http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub
 
-If $0 has already been updated, send the following data and any
-information you think might be pertinent to config-patches@gnu.org to
-provide the necessary information to handle your system.
+If the version you run ($0) is already up to date, please
+send the following data and any information you think might be
+pertinent to <config-patches@gnu.org> in order to provide the needed
+information to handle your system.
 
 config.guess timestamp = $timestamp
 
diff --git a/polly/lib/External/isl/config.sub b/polly/lib/External/isl/config.sub
index dd2ca93c6fbe3..8d39c4ba39fe3 100755
--- a/polly/lib/External/isl/config.sub
+++ b/polly/lib/External/isl/config.sub
@@ -2,7 +2,7 @@
 # Configuration validation subroutine script.
 #   Copyright 1992-2016 Free Software Foundation, Inc.
 
-timestamp='2016-11-04'
+timestamp='2016-03-30'
 
 # 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
@@ -117,7 +117,7 @@ case $maybe_os in
   nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-newlib* | \
   linux-musl* | linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
   knetbsd*-gnu* | netbsd*-gnu* | netbsd*-eabi* | \
-  kopensolaris*-gnu* | cloudabi*-eabi* | \
+  kopensolaris*-gnu* | \
   storm-chaos* | os2-emx* | rtmk-nova*)
     os=-$maybe_os
     basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
@@ -301,7 +301,6 @@ case $basic_machine in
 	| open8 | or1k | or1knd | or32 \
 	| pdp10 | pdp11 | pj | pjl \
 	| powerpc | powerpc64 | powerpc64le | powerpcle \
-	| pru \
 	| pyramid \
 	| riscv32 | riscv64 \
 	| rl78 | rx \
@@ -429,7 +428,6 @@ case $basic_machine in
 	| orion-* \
 	| pdp10-* | pdp11-* | pj-* | pjl-* | pn-* | power-* \
 	| powerpc-* | powerpc64-* | powerpc64le-* | powerpcle-* \
-	| pru-* \
 	| pyramid-* \
 	| riscv32-* | riscv64-* \
 	| rl78-* | romp-* | rs6000-* | rx-* \
@@ -645,14 +643,6 @@ case $basic_machine in
 		basic_machine=m68k-bull
 		os=-sysv3
 		;;
-	e500v[12])
-		basic_machine=powerpc-unknown
-		os=$os"spe"
-		;;
-	e500v[12]-*)
-		basic_machine=powerpc-`echo $basic_machine | sed 's/^[^-]*-//'`
-		os=$os"spe"
-		;;
 	ebmon29k)
 		basic_machine=a29k-amd
 		os=-ebmon
@@ -1032,7 +1022,7 @@ case $basic_machine in
 	ppc-* | ppcbe-*)
 		basic_machine=powerpc-`echo $basic_machine | sed 's/^[^-]*-//'`
 		;;
-	ppcle | powerpclittle)
+	ppcle | powerpclittle | ppc-le | powerpc-little)
 		basic_machine=powerpcle-unknown
 		;;
 	ppcle-* | powerpclittle-*)
@@ -1042,7 +1032,7 @@ case $basic_machine in
 		;;
 	ppc64-*) basic_machine=powerpc64-`echo $basic_machine | sed 's/^[^-]*-//'`
 		;;
-	ppc64le | powerpc64little)
+	ppc64le | powerpc64little | ppc64-le | powerpc64-little)
 		basic_machine=powerpc64le-unknown
 		;;
 	ppc64le-* | powerpc64little-*)
@@ -1399,7 +1389,7 @@ case $os in
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
 	      | -chorusos* | -chorusrdb* | -cegcc* \
 	      | -cygwin* | -msys* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
-	      | -midipix* | -mingw32* | -mingw64* | -linux-gnu* | -linux-android* \
+	      | -mingw32* | -mingw64* | -linux-gnu* | -linux-android* \
 	      | -linux-newlib* | -linux-musl* | -linux-uclibc* \
 	      | -uxpv* | -beos* | -mpeix* | -udk* | -moxiebox* \
 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
@@ -1409,7 +1399,7 @@ case $os in
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
 	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
-	      | -onefs* | -tirtos* | -phoenix* | -fuchsia*)
+	      | -onefs* | -tirtos*)
 	# Remember, each alternative MUST END IN *, to match a version number.
 		;;
 	-qnx*)
diff --git a/polly/lib/External/isl/include/isl/mat.h b/polly/lib/External/isl/include/isl/mat.h
index fc21fd2439f62..8764c96f3658e 100644
--- a/polly/lib/External/isl/include/isl/mat.h
+++ b/polly/lib/External/isl/include/isl/mat.h
@@ -27,12 +27,12 @@ isl_ctx *isl_mat_get_ctx(__isl_keep isl_mat *mat);
 
 __isl_give isl_mat *isl_mat_alloc(isl_ctx *ctx,
 	unsigned n_row, unsigned n_col);
-struct isl_mat *isl_mat_dup(struct isl_mat *mat);
+__isl_give isl_mat *isl_mat_dup(__isl_keep isl_mat *mat);
 struct isl_mat *isl_mat_extend(struct isl_mat *mat,
 	unsigned n_row, unsigned n_col);
 struct isl_mat *isl_mat_identity(struct isl_ctx *ctx, unsigned n_row);
 __isl_give isl_mat *isl_mat_copy(__isl_keep isl_mat *mat);
-struct isl_mat *isl_mat_cow(struct isl_mat *mat);
+__isl_give isl_mat *isl_mat_cow(__isl_take isl_mat *mat);
 __isl_null isl_mat *isl_mat_free(__isl_take isl_mat *mat);
 
 int isl_mat_rows(__isl_keep isl_mat *mat);
@@ -73,9 +73,9 @@ __isl_give isl_mat *isl_mat_right_kernel(__isl_take isl_mat *mat);
 __isl_give isl_mat *isl_mat_normalize(__isl_take isl_mat *mat);
 __isl_give isl_mat *isl_mat_normalize_row(__isl_take isl_mat *mat, int row);
 
-struct isl_mat *isl_mat_drop_cols(struct isl_mat *mat,
-				unsigned col, unsigned n);
-struct isl_mat *isl_mat_drop_rows(struct isl_mat *mat,
+__isl_give isl_mat *isl_mat_drop_cols(__isl_take isl_mat *mat,
+	unsigned col, unsigned n);
+__isl_give isl_mat *isl_mat_drop_rows(__isl_take isl_mat *mat,
 				unsigned row, unsigned n);
 __isl_give isl_mat *isl_mat_insert_cols(__isl_take isl_mat *mat,
 				unsigned col, unsigned n);
diff --git a/polly/lib/External/isl/include/isl/set.h b/polly/lib/External/isl/include/isl/set.h
index a0bc344c04e49..76c00fa11ba4f 100644
--- a/polly/lib/External/isl/include/isl/set.h
+++ b/polly/lib/External/isl/include/isl/set.h
@@ -266,8 +266,8 @@ __isl_give isl_basic_set *isl_set_unshifted_simple_hull_from_set_list(
 	__isl_take isl_set *set, __isl_take isl_set_list *list);
 __isl_give isl_basic_set *isl_set_bounded_simple_hull(__isl_take isl_set *set);
 
-struct isl_set *isl_set_union_disjoint(
-			struct isl_set *set1, struct isl_set *set2);
+__isl_give isl_set *isl_set_union_disjoint(
+	__isl_take isl_set *set1, __isl_take isl_set *set2);
 __isl_export
 __isl_give isl_set *isl_set_union(
 		__isl_take isl_set *set1,
@@ -337,7 +337,7 @@ __isl_give isl_basic_set *isl_basic_set_eliminate(
 	enum isl_dim_type type, unsigned first, unsigned n);
 __isl_give isl_set *isl_set_eliminate(__isl_take isl_set *set,
 	enum isl_dim_type type, unsigned first, unsigned n);
-struct isl_set *isl_set_eliminate_dims(struct isl_set *set,
+__isl_give isl_set *isl_set_eliminate_dims(__isl_take isl_set *set,
 		unsigned first, unsigned n);
 __isl_give isl_set *isl_set_remove_dims(__isl_take isl_set *bset,
 	enum isl_dim_type type, unsigned first, unsigned n);
@@ -399,7 +399,7 @@ __isl_give isl_basic_set *isl_basic_set_neg(__isl_take isl_basic_set *bset);
 __isl_give isl_set *isl_set_neg(__isl_take isl_set *set);
 
 __isl_give isl_set *isl_set_make_disjoint(__isl_take isl_set *set);
-struct isl_set *isl_basic_set_compute_divs(struct isl_basic_set *bset);
+__isl_give isl_set *isl_basic_set_compute_divs(__isl_take isl_basic_set *bset);
 __isl_give isl_set *isl_set_compute_divs(__isl_take isl_set *set);
 ISL_DEPRECATED
 __isl_give isl_set *isl_set_align_divs(__isl_take isl_set *set);
diff --git a/polly/lib/External/isl/include/isl/vec.h b/polly/lib/External/isl/include/isl/vec.h
index e73278cd23652..6b587943e9664 100644
--- a/polly/lib/External/isl/include/isl/vec.h
+++ b/polly/lib/External/isl/include/isl/vec.h
@@ -44,7 +44,7 @@ void isl_vec_dump(__isl_keep isl_vec *vec);
 __isl_give isl_printer *isl_printer_print_vec(__isl_take isl_printer *printer,
 	__isl_keep isl_vec *vec);
 
-struct isl_vec *isl_vec_ceil(struct isl_vec *vec);
+__isl_give isl_vec *isl_vec_ceil(__isl_take isl_vec *vec);
 struct isl_vec *isl_vec_normalize(struct isl_vec *vec);
 __isl_give isl_vec *isl_vec_set_si(__isl_take isl_vec *vec, int v);
 __isl_give isl_vec *isl_vec_set_val(__isl_take isl_vec *vec,
diff --git a/polly/lib/External/isl/isl_map.c b/polly/lib/External/isl/isl_map.c
index 960f80fd89209..cb3b376071d37 100644
--- a/polly/lib/External/isl/isl_map.c
+++ b/polly/lib/External/isl/isl_map.c
@@ -1173,7 +1173,7 @@ struct isl_basic_set *isl_basic_set_alloc(struct isl_ctx *ctx,
 	return bset_from_bmap(bmap);
 }
 
-struct isl_basic_set *isl_basic_set_alloc_space(__isl_take isl_space *dim,
+__isl_give isl_basic_set *isl_basic_set_alloc_space(__isl_take isl_space *dim,
 		unsigned extra, unsigned n_eq, unsigned n_ineq)
 {
 	struct isl_basic_map *bmap;
@@ -1853,7 +1853,8 @@ __isl_give isl_basic_map *isl_basic_map_extend_space(
 	return NULL;
 }
 
-struct isl_basic_set *isl_basic_set_extend_space(struct isl_basic_set *base,
+__isl_give isl_basic_set *isl_basic_set_extend_space(
+	__isl_take isl_basic_set *base,
 		__isl_take isl_space *dim, unsigned extra,
 		unsigned n_eq, unsigned n_ineq)
 {
@@ -2049,7 +2050,8 @@ __isl_give isl_basic_map *isl_basic_map_set_to_empty(
 	return NULL;
 }
 
-struct isl_basic_set *isl_basic_set_set_to_empty(struct isl_basic_set *bset)
+__isl_give isl_basic_set *isl_basic_set_set_to_empty(
+	__isl_take isl_basic_set *bset)
 {
 	return bset_from_bmap(isl_basic_map_set_to_empty(bset_to_bmap(bset)));
 }
@@ -2171,8 +2173,8 @@ static void constraint_drop_vars(isl_int *c, unsigned n, unsigned rem)
  * the div array too as the number of rows in this array is assumed
  * to be equal to extra.
  */
-struct isl_basic_set *isl_basic_set_drop_dims(
-		struct isl_basic_set *bset, unsigned first, unsigned n)
+__isl_give isl_basic_set *isl_basic_set_drop_dims(
+	__isl_take isl_basic_set *bset, unsigned first, unsigned n)
 {
 	return isl_basic_map_drop(bset_to_bmap(bset), isl_dim_set, first, n);
 }
@@ -5300,8 +5302,8 @@ int isl_basic_map_add_div_constraint(__isl_keep isl_basic_map *bmap,
 		return add_lower_div_constraint(bmap, div_pos, bmap->div[div]);
 }
 
-struct isl_basic_set *isl_basic_map_underlying_set(
-		struct isl_basic_map *bmap)
+__isl_give isl_basic_set *isl_basic_map_underlying_set(
+	__isl_take isl_basic_map *bmap)
 {
 	if (!bmap)
 		goto error;
@@ -5355,8 +5357,8 @@ __isl_give isl_basic_set_list *isl_basic_map_list_underlying_set(
 	return list;
 }
 
-struct isl_basic_map *isl_basic_map_overlying_set(
-	struct isl_basic_set *bset, struct isl_basic_map *like)
+__isl_give isl_basic_map *isl_basic_map_overlying_set(
+	__isl_take isl_basic_set *bset, __isl_take isl_basic_map *like)
 {
 	struct isl_basic_map *bmap;
 	struct isl_ctx *ctx;
@@ -5425,7 +5427,7 @@ struct isl_basic_set *isl_basic_set_from_underlying_set(
 							bset_to_bmap(like)));
 }
 
-struct isl_set *isl_map_underlying_set(struct isl_map *map)
+__isl_give isl_set *isl_map_underlying_set(__isl_take isl_map *map)
 {
 	int i;
 
@@ -7597,7 +7599,7 @@ __isl_give isl_map *isl_map_compute_divs(__isl_take isl_map *map)
 	return res;
 }
 
-struct isl_set *isl_basic_set_compute_divs(struct isl_basic_set *bset)
+__isl_give isl_set *isl_basic_set_compute_divs(__isl_take isl_basic_set *bset)
 {
 	return set_from_map(isl_basic_map_compute_divs(bset_to_bmap(bset)));
 }
@@ -7778,8 +7780,8 @@ __isl_give isl_map *isl_map_union(__isl_take isl_map *map1,
 	return isl_map_align_params_map_map_and(map1, map2, &map_union_aligned);
 }
 
-struct isl_set *isl_set_union_disjoint(
-			struct isl_set *set1, struct isl_set *set2)
+__isl_give isl_set *isl_set_union_disjoint(
+	__isl_take isl_set *set1, __isl_take isl_set *set2)
 {
 	return set_from_map(isl_map_union_disjoint(set_to_map(set1),
 						    set_to_map(set2)));
diff --git a/polly/lib/External/isl/isl_map_private.h b/polly/lib/External/isl/isl_map_private.h
index d5b250397829d..ba2937efe89cd 100644
--- a/polly/lib/External/isl/isl_map_private.h
+++ b/polly/lib/External/isl/isl_map_private.h
@@ -194,7 +194,8 @@ isl_bool isl_basic_map_compatible_range(__isl_keep isl_basic_map *bmap,
 __isl_give isl_basic_map *isl_basic_map_extend_space(
 	__isl_take isl_basic_map *base, __isl_take isl_space *dim,
 	unsigned extra, unsigned n_eq, unsigned n_ineq);
-struct isl_basic_set *isl_basic_set_extend_space(struct isl_basic_set *base,
+__isl_give isl_basic_set *isl_basic_set_extend_space(
+	__isl_take isl_basic_set *base,
 		__isl_take isl_space *dim, unsigned extra,
 		unsigned n_eq, unsigned n_ineq);
 struct isl_basic_set *isl_basic_set_add_constraints(struct isl_basic_set *bset1,
@@ -263,15 +264,16 @@ __isl_give isl_set *isl_basic_set_list_union(
 
 __isl_give isl_basic_map *isl_basic_map_set_to_empty(
 	__isl_take isl_basic_map *bmap);
-struct isl_basic_set *isl_basic_set_set_to_empty(struct isl_basic_set *bset);
+__isl_give isl_basic_set *isl_basic_set_set_to_empty(
+	__isl_take isl_basic_set *bset);
 struct isl_basic_set *isl_basic_set_order_divs(struct isl_basic_set *bset);
 void isl_basic_map_swap_div(struct isl_basic_map *bmap, int a, int b);
 void isl_basic_set_swap_div(struct isl_basic_set *bset, int a, int b);
 __isl_give isl_basic_map *isl_basic_map_order_divs(
 	__isl_take isl_basic_map *bmap);
 __isl_give isl_map *isl_map_order_divs(__isl_take isl_map *map);
-struct isl_basic_map *isl_basic_map_align_divs(
-		struct isl_basic_map *dst, struct isl_basic_map *src);
+__isl_give isl_basic_map *isl_basic_map_align_divs(
+	__isl_take isl_basic_map *dst, __isl_keep isl_basic_map *src);
 __isl_give isl_map *isl_map_align_divs_to_basic_map_list(
 	__isl_take isl_map *map, __isl_keep isl_basic_map_list *list);
 __isl_give isl_basic_map_list *isl_basic_map_list_align_divs_to_basic_map(
@@ -284,8 +286,8 @@ __isl_give isl_basic_map *isl_basic_map_sort_divs(
 __isl_give isl_map *isl_map_sort_divs(__isl_take isl_map *map);
 __isl_give isl_basic_map *isl_basic_map_gauss(__isl_take isl_basic_map *bmap,
 	int *progress);
-struct isl_basic_set *isl_basic_set_gauss(
-	struct isl_basic_set *bset, int *progress);
+__isl_give isl_basic_set *isl_basic_set_gauss(
+	__isl_take isl_basic_set *bset, int *progress);
 int isl_basic_map_constraint_cmp(__isl_keep isl_basic_map *bmap,
 	isl_int *c1, isl_int *c2);
 __isl_give isl_basic_map *isl_basic_map_sort_constraints(
@@ -298,18 +300,19 @@ isl_bool isl_basic_map_plain_is_equal(__isl_keep isl_basic_map *bmap1,
 	__isl_keep isl_basic_map *bmap2);
 __isl_give isl_basic_map *isl_basic_map_normalize_constraints(
 	__isl_take isl_basic_map *bmap);
-struct isl_basic_set *isl_basic_set_normalize_constraints(
-	struct isl_basic_set *bset);
+__isl_give isl_basic_set *isl_basic_set_normalize_constraints(
+	__isl_take isl_basic_set *bset);
 __isl_give isl_basic_map *isl_basic_map_implicit_equalities(
 	__isl_take isl_basic_map *bmap);
-struct isl_basic_set *isl_basic_map_underlying_set(struct isl_basic_map *bmap);
+__isl_give isl_basic_set *isl_basic_map_underlying_set(
+	__isl_take isl_basic_map *bmap);
 __isl_give isl_basic_set *isl_basic_set_underlying_set(
 		__isl_take isl_basic_set *bset);
 __isl_give isl_basic_set_list *isl_basic_map_list_underlying_set(
 	__isl_take isl_basic_map_list *list);
-struct isl_set *isl_map_underlying_set(struct isl_map *map);
-struct isl_basic_map *isl_basic_map_overlying_set(struct isl_basic_set *bset,
-	struct isl_basic_map *like);
+__isl_give isl_set *isl_map_underlying_set(__isl_take isl_map *map);
+__isl_give isl_basic_map *isl_basic_map_overlying_set(
+	__isl_take isl_basic_set *bset, __isl_take isl_basic_map *like);
 __isl_give isl_basic_map *isl_basic_map_drop_constraint_involving_unknown_divs(
 	__isl_take isl_basic_map *bmap);
 __isl_give isl_map *isl_map_drop_constraint_involving_unknown_divs(
@@ -322,8 +325,8 @@ __isl_give isl_basic_map *isl_basic_map_drop(__isl_take isl_basic_map *bmap,
 	enum isl_dim_type type, unsigned first, unsigned n);
 __isl_give isl_set *isl_set_drop(__isl_take isl_set *set,
 	enum isl_dim_type type, unsigned first, unsigned n);
-struct isl_basic_set *isl_basic_set_drop_dims(
-		struct isl_basic_set *bset, unsigned first, unsigned n);
+__isl_give isl_basic_set *isl_basic_set_drop_dims(
+	__isl_take isl_basic_set *bset, unsigned first, unsigned n);
 __isl_give isl_map *isl_map_drop(__isl_take isl_map *map,
 	enum isl_dim_type type, unsigned first, unsigned n);
 __isl_give isl_basic_map *isl_basic_map_drop_unrelated_constraints(
@@ -358,8 +361,8 @@ int isl_basic_map_add_div_constraint(__isl_keep isl_basic_map *bmap,
 int isl_basic_map_add_div_constraints(struct isl_basic_map *bmap, unsigned div);
 __isl_give isl_basic_map *isl_basic_map_add_known_div_constraints(
 	__isl_take isl_basic_map *bmap);
-struct isl_basic_map *isl_basic_map_drop_redundant_divs(
-	struct isl_basic_map *bmap);
+__isl_give isl_basic_map *isl_basic_map_drop_redundant_divs(
+	__isl_take isl_basic_map *bmap);
 
 __isl_give isl_basic_set *isl_basic_set_recession_cone(
 	__isl_take isl_basic_set *bset);
@@ -388,9 +391,10 @@ __isl_give isl_basic_map *isl_basic_map_from_multi_aff2(
 
 struct isl_mat;
 
-struct isl_basic_set *isl_basic_set_preimage(struct isl_basic_set *bset,
-	struct isl_mat *mat);
-struct isl_set *isl_set_preimage(struct isl_set *set, struct isl_mat *mat);
+__isl_give isl_basic_set *isl_basic_set_preimage(
+	__isl_take isl_basic_set *bset, __isl_take isl_mat *mat);
+__isl_give isl_set *isl_set_preimage(
+	__isl_take isl_set *set, __isl_take isl_mat *mat);
 
 __isl_give isl_basic_map *isl_basic_map_transform_dims(
 	__isl_take isl_basic_map *bmap, enum isl_dim_type type, unsigned first,
diff --git a/polly/lib/External/isl/isl_map_simplify.c b/polly/lib/External/isl/isl_map_simplify.c
index 2b8cd896c057f..06806d9e98419 100644
--- a/polly/lib/External/isl/isl_map_simplify.c
+++ b/polly/lib/External/isl/isl_map_simplify.c
@@ -98,8 +98,8 @@ __isl_give isl_basic_map *isl_basic_map_normalize_constraints(
 	return bmap;
 }
 
-struct isl_basic_set *isl_basic_set_normalize_constraints(
-	struct isl_basic_set *bset)
+__isl_give isl_basic_set *isl_basic_set_normalize_constraints(
+	__isl_take isl_basic_set *bset)
 {
 	isl_basic_map *bmap = bset_to_bmap(bset);
 	return bset_from_bmap(isl_basic_map_normalize_constraints(bmap));
@@ -594,8 +594,8 @@ __isl_give isl_basic_map *isl_basic_map_gauss(__isl_take isl_basic_map *bmap,
 	return bmap;
 }
 
-struct isl_basic_set *isl_basic_set_gauss(
-	struct isl_basic_set *bset, int *progress)
+__isl_give isl_basic_set *isl_basic_set_gauss(
+	__isl_take isl_basic_set *bset, int *progress)
 {
 	return bset_from_bmap(isl_basic_map_gauss(bset_to_bmap(bset),
 							progress));
diff --git a/polly/lib/External/isl/isl_mat.c b/polly/lib/External/isl/isl_mat.c
index 3d0eb297ab998..0e9666c8e5dfe 100644
--- a/polly/lib/External/isl/isl_mat.c
+++ b/polly/lib/External/isl/isl_mat.c
@@ -203,7 +203,7 @@ __isl_give isl_mat *isl_mat_copy(__isl_keep isl_mat *mat)
 	return mat;
 }
 
-struct isl_mat *isl_mat_dup(struct isl_mat *mat)
+__isl_give isl_mat *isl_mat_dup(__isl_keep isl_mat *mat)
 {
 	int i;
 	struct isl_mat *mat2;
@@ -218,7 +218,7 @@ struct isl_mat *isl_mat_dup(struct isl_mat *mat)
 	return mat2;
 }
 
-struct isl_mat *isl_mat_cow(struct isl_mat *mat)
+__isl_give isl_mat *isl_mat_cow(__isl_take isl_mat *mat)
 {
 	struct isl_mat *mat2;
 	if (!mat)
@@ -1284,8 +1284,8 @@ static int preimage(struct isl_ctx *ctx, isl_int **q, unsigned n,
  * the div array too as the number of rows in this array is assumed
  * to be equal to extra.
  */
-struct isl_basic_set *isl_basic_set_preimage(struct isl_basic_set *bset,
-	struct isl_mat *mat)
+__isl_give isl_basic_set *isl_basic_set_preimage(
+	__isl_take isl_basic_set *bset, __isl_take isl_mat *mat)
 {
 	struct isl_ctx *ctx;
 
@@ -1340,7 +1340,8 @@ struct isl_basic_set *isl_basic_set_preimage(struct isl_basic_set *bset,
 	return NULL;
 }
 
-struct isl_set *isl_set_preimage(struct isl_set *set, struct isl_mat *mat)
+__isl_give isl_set *isl_set_preimage(
+	__isl_take isl_set *set, __isl_take isl_mat *mat)
 {
 	int i;
 
@@ -1428,7 +1429,8 @@ void isl_mat_dump(__isl_keep isl_mat *mat)
 	isl_mat_print_internal(mat, stderr, 0);
 }
 
-struct isl_mat *isl_mat_drop_cols(struct isl_mat *mat, unsigned col, unsigned n)
+__isl_give isl_mat *isl_mat_drop_cols(__isl_take isl_mat *mat,
+	unsigned col, unsigned n)
 {
 	int r;
 
@@ -1448,7 +1450,8 @@ struct isl_mat *isl_mat_drop_cols(struct isl_mat *mat, unsigned col, unsigned n)
 	return mat;
 }
 
-struct isl_mat *isl_mat_drop_rows(struct isl_mat *mat, unsigned row, unsigned n)
+__isl_give isl_mat *isl_mat_drop_rows(__isl_take isl_mat *mat,
+	unsigned row, unsigned n)
 {
 	int r;
 
diff --git a/polly/lib/External/isl/isl_vec.c b/polly/lib/External/isl/isl_vec.c
index 25976c19da6c3..a48abf9ed4ad2 100644
--- a/polly/lib/External/isl/isl_vec.c
+++ b/polly/lib/External/isl/isl_vec.c
@@ -30,7 +30,7 @@ uint32_t isl_vec_get_hash(__isl_keep isl_vec *vec)
 	return isl_seq_get_hash(vec->el, vec->size);
 }
 
-struct isl_vec *isl_vec_alloc(struct isl_ctx *ctx, unsigned size)
+__isl_give isl_vec *isl_vec_alloc(struct isl_ctx *ctx, unsigned size)
 {
 	struct isl_vec *vec;
 
@@ -439,7 +439,7 @@ void isl_vec_lcm(struct isl_vec *vec, isl_int *lcm)
 /* Given a rational vector, with the denominator in the first element
  * of the vector, round up all coordinates.
  */
-struct isl_vec *isl_vec_ceil(struct isl_vec *vec)
+__isl_give isl_vec *isl_vec_ceil(__isl_take isl_vec *vec)
 {
 	vec = isl_vec_cow(vec);
 	if (!vec)
diff --git a/polly/lib/External/isl/ltmain.sh b/polly/lib/External/isl/ltmain.sh
index a736cf9942561..2ad8be8483de8 100644
--- a/polly/lib/External/isl/ltmain.sh
+++ b/polly/lib/External/isl/ltmain.sh
@@ -31,7 +31,7 @@
 
 PROGRAM=libtool
 PACKAGE=libtool
-VERSION="2.4.6 Debian-2.4.6-2"
+VERSION="2.4.6 Debian-2.4.6-1"
 package_revision=2.4.6
 
 
@@ -1977,7 +1977,7 @@ func_version ()
 # End:
 
 # Set a version string.
-scriptversion='(GNU libtool) 2.4.6'
+scriptversion='(GNU libtool) 2.4.6 Debian-2.4.6-1'
 
 
 # func_echo ARG...
@@ -2068,7 +2068,7 @@ include the following information:
        compiler:       $LTCC
        compiler flags: $LTCFLAGS
        linker:         $LD (gnu? $with_gnu_ld)
-       version:        $progname $scriptversion Debian-2.4.6-2
+       version:        $progname $scriptversion
        automake:       `($AUTOMAKE --version) 2>/dev/null |$SED 1q`
        autoconf:       `($AUTOCONF --version) 2>/dev/null |$SED 1q`