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

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 12aec07e44e2a37f4081a7a40dba51574999613b
Author: Paul Eggert <***@cs.ucla.edu>
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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