Sync with Gnulib stable-202507 code (a8ac9f9ce5)

1 files changed, 11 insertions, 7 deletions

diff --git a/gl/m4/stdalign.m4 b/gl/m4/stdalign.m4
index 2b4762f3..885feafd 100644
--- a/gl/m4/stdalign.m4
+++ b/gl/m4/stdalign.m4
@@ -1,9 +1,10 @@
 # stdalign.m4
-# serial 1
-dnl Copyright 2011-2024 Free Software Foundation, Inc.
+# serial 3
+dnl Copyright 2011-2025 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
 
 # Check for alignas and alignof that conform to C23.
 
@@ -81,10 +82,10 @@ AC_DEFUN([gl_ALIGNASOF],
 
    References:
    ISO C23 (latest free draft
-   <http://www.open-std.org/jtc1/sc22/wg14/www/docs/n3047.pdf>)
+   <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3096.pdf>)
    sections 6.5.3.4, 6.7.5, 7.15.
    C++11 (latest free draft
-   <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>)
+   <https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2011/n3242.pdf>)
    section 18.10. */
 
 /* alignof (TYPE), also known as _Alignof (TYPE), yields the alignment
@@ -103,11 +104,13 @@ AC_DEFUN([gl_ALIGNASOF],
 
 /* GCC releases before GCC 4.9 had a bug in _Alignof.  See GCC bug 52023
    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52023>.
-   clang versions < 8.0.0 have the same bug.  */
+   clang versions < 8.0.0 have the same bug.
+   IBM XL C V16.1.0 cc (non-clang) has the same bug.  */
 #  if (!defined __STDC_VERSION__ || __STDC_VERSION__ < 201112 \
        || (defined __GNUC__ && __GNUC__ < 4 + (__GNUC_MINOR__ < 9) \
            && !defined __clang__) \
-       || (defined __clang__ && __clang_major__ < 8))
+       || (defined __clang__ && __clang_major__ < 8) \
+       || defined __xlC__)
 #   undef/**/_Alignof
 #   ifdef __cplusplus
 #    if (201103 <= __cplusplus || defined _MSC_VER)
@@ -178,7 +181,8 @@ AC_DEFUN([gl_ALIGNASOF],
 #  if ((defined _Alignas \
         && !(defined __cplusplus \
              && (201103 <= __cplusplus || defined _MSC_VER))) \
-       || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
+       || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__ \
+           && !defined __xlC__))
 #   define alignas _Alignas
 #  endif
 # endif