diff -r 000000000000 -r 6474c204b198 js/src/jscpucfg.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jscpucfg.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,112 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jscpucfg_h
+#define jscpucfg_h
+
+#define JS_HAVE_LONG_LONG
+
+#if defined(_WIN64)
+
+# if defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_)
+#  define IS_LITTLE_ENDIAN 1
+#  undef  IS_BIG_ENDIAN
+# else  /* !(defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_)) */
+#  error "CPU type is unknown"
+# endif /* !(defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_)) */
+
+#elif defined(_WIN32)
+
+# ifdef __WATCOMC__
+#  define HAVE_VA_LIST_AS_ARRAY 1
+# endif
+
+# define IS_LITTLE_ENDIAN 1
+# undef  IS_BIG_ENDIAN
+
+#elif defined(__APPLE__) || defined(__powerpc__) || defined(__ppc__)
+# if __LITTLE_ENDIAN__
+#  define IS_LITTLE_ENDIAN 1
+#  undef  IS_BIG_ENDIAN
+# elif __BIG_ENDIAN__
+#  undef  IS_LITTLE_ENDIAN
+#  define IS_BIG_ENDIAN 1
+# endif
+
+#elif defined(JS_HAVE_ENDIAN_H)
+# include <endian.h>
+
+# if defined(__BYTE_ORDER)
+#  if __BYTE_ORDER == __LITTLE_ENDIAN
+#   define IS_LITTLE_ENDIAN 1
+#   undef  IS_BIG_ENDIAN
+#  elif __BYTE_ORDER == __BIG_ENDIAN
+#   undef  IS_LITTLE_ENDIAN
+#   define IS_BIG_ENDIAN 1
+#  endif
+# else /* !defined(__BYTE_ORDER) */
+#  error "endian.h does not define __BYTE_ORDER. Cannot determine endianness."
+# endif
+
+/* BSDs */
+#elif defined(JS_HAVE_MACHINE_ENDIAN_H)
+# include <sys/types.h>
+# include <machine/endian.h>
+
+# if defined(_BYTE_ORDER)
+#  if _BYTE_ORDER == _LITTLE_ENDIAN
+#   define IS_LITTLE_ENDIAN 1
+#   undef  IS_BIG_ENDIAN
+#  elif _BYTE_ORDER == _BIG_ENDIAN
+#   undef  IS_LITTLE_ENDIAN
+#   define IS_BIG_ENDIAN 1
+#  endif
+# else /* !defined(_BYTE_ORDER) */
+#  error "machine/endian.h does not define _BYTE_ORDER. Cannot determine endianness."
+# endif
+
+#elif defined(JS_HAVE_SYS_ISA_DEFS_H)
+# include <sys/isa_defs.h>
+
+# if defined(_BIG_ENDIAN)
+#  undef IS_LITTLE_ENDIAN
+#  define IS_BIG_ENDIAN 1
+# elif defined(_LITTLE_ENDIAN)
+#  define IS_LITTLE_ENDIAN 1
+#  undef IS_BIG_ENDIAN
+# else /* !defined(_LITTLE_ENDIAN) */
+#  error "sys/isa_defs.h does not define _BIG_ENDIAN or _LITTLE_ENDIAN. Cannot determine endianness."
+# endif
+# if !defined(JS_STACK_GROWTH_DIRECTION)
+#  if defined(_STACK_GROWS_UPWARD)
+#   define JS_STACK_GROWTH_DIRECTION (1)
+#  elif defined(_STACK_GROWS_DOWNWARD)
+#   define JS_STACK_GROWTH_DIRECTION (-1)
+#  endif
+# endif
+
+#elif defined(__sparc) || defined(__sparc__) || \
+      defined(_POWER) || defined(__hppa) || \
+      defined(_MIPSEB) || defined(_BIG_ENDIAN)
+/* IA64 running HP-UX will have _BIG_ENDIAN defined.
+ * IA64 running Linux will have endian.h and be handled above.
+ */
+# undef IS_LITTLE_ENDIAN
+# define IS_BIG_ENDIAN 1
+
+#else /* !defined(__sparc) && !defined(__sparc__) && ... */
+# error "Cannot determine endianness of your platform. Please add support to jscpucfg.h."
+#endif
+
+#ifndef JS_STACK_GROWTH_DIRECTION
+# ifdef __hppa
+#  define JS_STACK_GROWTH_DIRECTION (1)
+# else
+#  define JS_STACK_GROWTH_DIRECTION (-1)
+# endif
+#endif
+
+#endif /* jscpucfg_h */