On 02/24/2016 10:51 AM, Nick Bowler wrote:
Right, the C11 standard says that the controlling expression of _Static_assert must be an integer constant expression.
Thanks, I installed the attached into autoconf master; it should fix these problems.
From d393c88f8f170c203052d1aacc7fb876b651ed4d Mon Sep 17 00:00:00 2001 From: Paul Eggert <eggert@cs.ucla.edu> Date: Tue, 15 Mar 2016 08:56:43 -0700 Subject: [PATCH] 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 --- lib/autoconf/c.m4 | 11 +++++++---- 1 file 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"; } ]]) -- 2.5.0
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