Support unsigned __int20 in checks for size_t mangling

2017-01-20  Joe Seymour  <joe.s@somniumtech.com>

	* acinclude.m4 (GLIBCXX_CHECK_SIZE_T_MANGLING): Support uint20_t.
	* configure: Regenerate.

From-SVN: r244727

libstdc++-v3/ChangeLog

+2017-01-20  Joe Seymour  <joe.s@somniumtech.com>
+
+	* acinclude.m4 (GLIBCXX_CHECK_SIZE_T_MANGLING): Support uint20_t.
+	* configure: Regenerate.
+
 2017-01-20  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/69240

libstdc++-v3/acinclude.m4

@@ -4460,12 +4460,16 @@ AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
                        [glibcxx_cv_size_t_mangling=y], [
           AC_TRY_COMPILE([],
                          [extern __SIZE_TYPE__ x; extern unsigned short x;],
-                         [glibcxx_cv_size_t_mangling=t],
+                         [glibcxx_cv_size_t_mangling=t], [
+            AC_TRY_COMPILE([],
+                           [extern __SIZE_TYPE__ x; extern __int20 unsigned x;],
+                           [glibcxx_cv_size_t_mangling=u6uint20],
                            [glibcxx_cv_size_t_mangling=x])
           ])
         ])
       ])
     ])
+  ])
   if test $glibcxx_cv_size_t_mangling = x; then
     AC_MSG_ERROR([Unknown underlying type for size_t])
   fi

libstdc++-v3/configure

@@ -80707,6 +80707,21 @@ _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   glibcxx_cv_size_t_mangling=t
 else
+
+            cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+extern __SIZE_TYPE__ x; extern __int20 unsigned x;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  glibcxx_cv_size_t_mangling=u6uint20
+else
   glibcxx_cv_size_t_mangling=x
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
@@ -80721,6 +80736,9 @@ fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_size_t_mangling" >&5
 $as_echo "$glibcxx_cv_size_t_mangling" >&6; }
   if test $glibcxx_cv_size_t_mangling = x; then