[SCM] GNU Autoconf source repository branch, master, updated. v2.69-157-g12aec07

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 12aec07e44e2a37f4081a7a40dba51574999613b
Author: Paul Eggert <address@hidden>
Date:   Tue Mar 15 08:56:43 2016 -0700

    Port C11 and C++11 testing to clang
    
    * lib/autoconf/c.m4 (_AC_C_C99_TEST_HEADER):
    Include stddef.h, for offsetof.
    (_AC_PROG_CC_C11): Limit _Static_assert to integer constant
    expressions.  Suggested by Nick Bowler in:
    http://lists.gnu.org/archive/html/autoconf/2016-02/msg00009.html
    (_AC_CXX_CXX11_TEST_BODY): Don't use string literals to initialize
    non-const pointers.  Suggested by Mike Miller in:
    http://lists.gnu.org/archive/html/autoconf/2016-02/msg00008.html

-----------------------------------------------------------------------

Summary of changes:
 lib/autoconf/c.m4 |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index fe87dbf..933955f 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1205,6 +1205,7 @@ AS_IF([test "x$ac_cv_prog_cc_$1" != xno], [$5], [$6])
 AC_DEFUN([_AC_C_C99_TEST_HEADER],
 [[#include <stdarg.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <wchar.h>
 #include <stdio.h>
@@ -1439,7 +1440,9 @@ struct anonymous
 [_AC_C_C99_TEST_BODY[
   v1.i = 2;
   v1.w.k = 5;
-  _Static_assert (&v1.i == &v1.w.k, "Anonymous union alignment botch");
+  _Static_assert ((offsetof (struct anonymous, i)
+                  == offsetof (struct anonymous, w.k)),
+                 "Anonymous union alignment botch");
 ]],
 dnl Try
 dnl GCC                -std=gnu11 (unused restrictive mode: -std=c11)
@@ -2453,9 +2456,9 @@ AC_DEFUN([_AC_CXX_CXX11_TEST_BODY],
 }
 {
   // Unicode literals
-  char *utf8 = u8"UTF-8 string \u2500";
-  char16_t *utf16 = u"UTF-8 string \u2500";
-  char32_t *utf32 = U"UTF-32 string \u2500";
+  char const *utf8 = u8"UTF-8 string \u2500";
+  char16_t const *utf16 = u"UTF-8 string \u2500";
+  char32_t const *utf32 = U"UTF-32 string \u2500";
 }
 ]])
 


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