From bf8c53ca0ab214ee794ba06376300e2da9cb51d2 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 17 Jan 2018 16:43:39 +0100
Subject: erts: Add ERTS_RESTRICT

---
 erts/configure.in | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/erts/configure.in b/erts/configure.in
index f15bb56435..9646c0d47d 100644
--- a/erts/configure.in
+++ b/erts/configure.in
@@ -1760,6 +1760,25 @@ if test $ac_cv_sizeof_void_p = 8; then
 fi
 AC_SUBST(BITS64)
 
+AC_MSG_CHECKING([for C compiler 'restrict' support])
+restrict_keyword=""
+for x in restrict __restrict; do
+    AC_TRY_COMPILE([int * $x foo(int * $x arg);
+		    int * $x foo(int * $x arg)
+		        { int * $x var=arg; return var;}
+		   ],[],
+		   [restrict_keyword=$x],[])
+    if test "x$restrict_keyword" != "x"; then
+	break
+    fi
+done
+AC_DEFINE_UNQUOTED(ERTS_RESTRICT,[$restrict_keyword],[Type qualifier restrict])
+if test "x$restrict_keyword" != "x"; then
+   AC_MSG_RESULT(yes)
+else
+   AC_MSG_RESULT(no)
+fi
+
 if test "x$ac_compiler_gnu" = "xyes"; then
 AC_MSG_CHECKING([if we should add -fno-tree-copyrename to CFLAGS for computed gotos to work properly])
 AC_TRY_COMPILE([],[
@@ -1779,8 +1798,6 @@ else
 	AC_MSG_RESULT(no)
 fi
 
-
-
 AC_MSG_CHECKING([for broken gcc-4.3.0 compiler])
 AC_TRY_RUN([
 /* pr36339.c */
-- 
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