diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index 323a757..8288423 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,3 +1,11 @@
+2014-05-26  Richard Biener  <rguenther@suse.de>
+
+	* configure.ac: Remove long long and __int64 type checks,
+	add check for uint64_t and fail if that wasn't found.
+	* include/cpplib.h (cpp_num_part): Use uint64_t.
+	* config.in: Regenerate.
+	* configure: Likewise.
+
 2014-05-21  Marek Polacek  <polacek@redhat.com>
 
 	PR c/61212
diff --git a/libcpp/config.in b/libcpp/config.in
index 1d69a75..8df00ec 100644
--- a/libcpp/config.in
+++ b/libcpp/config.in
@@ -180,9 +180,6 @@
 /* Define to 1 if you have the <locale.h> header file. */
 #undef HAVE_LOCALE_H
 
-/* Define to 1 if the system has the type `long long'. */
-#undef HAVE_LONG_LONG
-
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
@@ -231,9 +228,6 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
-/* Define to 1 if the system has the type `__int64'. */
-#undef HAVE___INT64
-
 /* Define as const if the declaration of iconv() needs const. */
 #undef ICONV_CONST
 
@@ -264,12 +258,6 @@
 /* The size of `long', as computed by sizeof. */
 #undef SIZEOF_LONG
 
-/* The size of `long long', as computed by sizeof. */
-#undef SIZEOF_LONG_LONG
-
-/* The size of `__int64', as computed by sizeof. */
-#undef SIZEOF___INT64
-
 /* If using the C implementation of alloca, define if you know the
    direction of stack growth for your system; otherwise it will be
    automatically deduced at runtime.
@@ -340,6 +328,11 @@
 /* Define to 1 if you need to in order for `stat' and other things to work. */
 #undef _POSIX_SOURCE
 
+/* Define for Solaris 2.5.1 so the uint64_t typedef from <sys/synch.h>,
+   <pthread.h>, or <semaphore.h> is not used. If the typedef were allowed, the
+   #define below would cause a syntax error. */
+#undef _UINT64_T
+
 /* Define to empty if `const' does not conform to ANSI C. */
 #undef const
 
@@ -361,6 +354,10 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #undef ssize_t
 
+/* Define to the type of an unsigned integer type of width exactly 64 bits if
+   such a type exists and the standard includes do not define it. */
+#undef uint64_t
+
 /* Define to the type of an unsigned integer type wide enough to hold a
    pointer, if such a type exists, and if the system does not define it. */
 #undef uintptr_t
diff --git a/libcpp/configure b/libcpp/configure
index 6b0f6dc..096ac8b 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -1822,6 +1822,58 @@
 
 } # ac_fn_c_check_type
 
+# ac_fn_c_find_uintX_t LINENO BITS VAR
+# ------------------------------------
+# Finds an unsigned integer type with width BITS, setting cache variable VAR
+# accordingly.
+ac_fn_c_find_uintX_t ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for uint$2_t" >&5
+$as_echo_n "checking for uint$2_t... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  eval "$3=no"
+     for ac_type in uint$2_t 'unsigned int' 'unsigned long int' \
+	 'unsigned long long int' 'unsigned short int' 'unsigned char'; do
+       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$ac_includes_default
+int
+main ()
+{
+static int test_array [1 - 2 * !(($ac_type) -1 >> ($2 - 1) == 1)];
+test_array [0] = 0
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  case $ac_type in #(
+  uint$2_t) :
+    eval "$3=yes" ;; #(
+  *) :
+    eval "$3=\$ac_type" ;;
+esac
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+       eval as_val=\$$3
+   if test "x$as_val" = x""no; then :
+
+else
+  break
+fi
+     done
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+
+} # ac_fn_c_find_uintX_t
+
 # ac_fn_c_compute_int LINENO EXPR VAR INCLUDES
 # --------------------------------------------
 # Tries to find the compile-time value of EXPR in a program that includes
@@ -5566,92 +5618,23 @@
 
 fi
 
-ac_fn_c_check_type "$LINENO" "long long" "ac_cv_type_long_long" "$ac_includes_default"
-if test "x$ac_cv_type_long_long" = x""yes; then :
+ac_fn_c_find_uintX_t "$LINENO" "64" "ac_cv_c_uint64_t"
+case $ac_cv_c_uint64_t in #(
+  no|yes) ;; #(
+  *)
 
-cat >>confdefs.h <<_ACEOF
-#define HAVE_LONG_LONG 1
-_ACEOF
-
-# The cast to long int works around a bug in the HP C Compiler
-# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
-# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
-# This bug is HP SR number 8606223364.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking size of long long" >&5
-$as_echo_n "checking size of long long... " >&6; }
-if test "${ac_cv_sizeof_long_long+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (long long))" "ac_cv_sizeof_long_long"        "$ac_includes_default"; then :
-
-else
-  if test "$ac_cv_type_long_long" = yes; then
-     { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ as_fn_set_status 77
-as_fn_error "cannot compute sizeof (long long)
-See \`config.log' for more details." "$LINENO" 5; }; }
-   else
-     ac_cv_sizeof_long_long=0
-   fi
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof_long_long" >&5
-$as_echo "$ac_cv_sizeof_long_long" >&6; }
-
+$as_echo "#define _UINT64_T 1" >>confdefs.h
 
 
 cat >>confdefs.h <<_ACEOF
-#define SIZEOF_LONG_LONG $ac_cv_sizeof_long_long
+#define uint64_t $ac_cv_c_uint64_t
 _ACEOF
+;;
+  esac
 
-
+if test x"$ac_cv_c_uint64_t" = x"no"; then
+  as_fn_error "uint64_t not found" "$LINENO" 5
 fi
-
-ac_fn_c_check_type "$LINENO" "__int64" "ac_cv_type___int64" "$ac_includes_default"
-if test "x$ac_cv_type___int64" = x""yes; then :
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE___INT64 1
-_ACEOF
-
-# The cast to long int works around a bug in the HP C Compiler
-# version HP92453-01 B.11.11.23709.GP, which incorrectly rejects
-# declarations like `int a3[[(sizeof (unsigned char)) >= 0]];'.
-# This bug is HP SR number 8606223364.
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking size of __int64" >&5
-$as_echo_n "checking size of __int64... " >&6; }
-if test "${ac_cv_sizeof___int64+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  if ac_fn_c_compute_int "$LINENO" "(long int) (sizeof (__int64))" "ac_cv_sizeof___int64"        "$ac_includes_default"; then :
-
-else
-  if test "$ac_cv_type___int64" = yes; then
-     { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-{ as_fn_set_status 77
-as_fn_error "cannot compute sizeof (__int64)
-See \`config.log' for more details." "$LINENO" 5; }; }
-   else
-     ac_cv_sizeof___int64=0
-   fi
-fi
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_sizeof___int64" >&5
-$as_echo "$ac_cv_sizeof___int64" >&6; }
-
-
-
-cat >>confdefs.h <<_ACEOF
-#define SIZEOF___INT64 $ac_cv_sizeof___int64
-_ACEOF
-
-
-fi
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether struct tm is in sys/time.h or time.h" >&5
 $as_echo_n "checking whether struct tm is in sys/time.h or time.h... " >&6; }
 if test "${ac_cv_struct_tm+set}" = set; then :
diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index 93616ad..5f008a4 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -64,8 +64,10 @@
 AC_TYPE_SSIZE_T
 AC_TYPE_UINTPTR_T
 AC_CHECK_TYPE(ptrdiff_t, int)
-AC_CHECK_TYPES([long long], [AC_CHECK_SIZEOF(long long)])
-AC_CHECK_TYPES([__int64], [AC_CHECK_SIZEOF(__int64)])
+AC_TYPE_UINT64_T
+if test x"$ac_cv_c_uint64_t" = x"no"; then
+  AC_MSG_ERROR([uint64_t not found])
+fi
 AC_STRUCT_TM
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(long)
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 594c899..a83452b 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -820,23 +820,9 @@
 /* A preprocessing number.  Code assumes that any unused high bits of
    the double integer are set to zero.  */
 
-/* Find a type with at least 64bit precision, mimicking hwint.h.
-   This type has to be equal to unsigned HOST_WIDE_INT, see
+/* This type has to be equal to unsigned HOST_WIDE_INT, see
    gcc/c-family/c-lex.c.  */
-#if SIZEOF_LONG >= 8
-typedef unsigned long cpp_num_part;
-#else
-# if SIZEOF_LONG_LONG >= 8
-typedef unsigned long long cpp_num_part;
-# else
-#  if SIZEOF___INT64 >= 8
-typedef unsigned __int64 cpp_num_part;
-#  else
-    #error "This line should be impossible to reach"
-#  endif
-# endif
-#endif
-
+typedef uint64_t cpp_num_part;
 typedef struct cpp_num cpp_num;
 struct cpp_num
 {