On AIX 7.3.1, with ibm-clang as compiler, I see a unit test failure:
FAIL: test-aligned_alloc
========================
../../gltests/test-aligned_alloc.c:52: assertion 'aligned2_blocks[i] != NULL'
failed
FAIL test-aligned_alloc (exit status: 134)
The problem here is that ibm-clang, with option -O2, has optimized away
the configure test, assuming that aligned_alloc() never returns NULL.
But it _does_ return NULL in this case.
Fixing the configure test result enables the Gnulib override, and the unit test
then succeeds.
2023-08-18 Bruno Haible <br...@clisp.org>
aligned_alloc: Fix test failure on AIX 7.3 with ibm-clang.
* m4/aligned_alloc.m4 (gl_FUNC_ALIGNED_ALLOC): Use 'volatile', to
disable optimization of ibm-clang -O2.
* doc/posix-functions/aligned_alloc.texi: Update version info.
diff --git a/doc/posix-functions/aligned_alloc.texi
b/doc/posix-functions/aligned_alloc.texi
index 7180cf3c12..557f11c6d4 100644
--- a/doc/posix-functions/aligned_alloc.texi
+++ b/doc/posix-functions/aligned_alloc.texi
@@ -11,7 +11,7 @@
@item
This function fails if the alignment argument is smaller than
@code{sizeof (void *)} on some platforms:
-macOS 11.1, AIX 7.2.
+macOS 11.1, AIX 7.3.1.
@end itemize
Portability problems not fixed by Gnulib:
diff --git a/m4/aligned_alloc.m4 b/m4/aligned_alloc.m4
index 8b4c10102e..f546c6ae80 100644
--- a/m4/aligned_alloc.m4
+++ b/m4/aligned_alloc.m4
@@ -1,4 +1,4 @@
-# aligned_alloc.m4 serial 5
+# aligned_alloc.m4 serial 6
dnl Copyright (C) 2020-2023 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -14,15 +14,16 @@ AC_DEFUN([gl_FUNC_ALIGNED_ALLOC]
gl_CHECK_FUNCS_ANDROID([aligned_alloc], [[#include <stdlib.h>]])
if test $ac_cv_func_aligned_alloc = yes; then
- dnl On macOS 11.1 and AIX 7.2, aligned_alloc returns NULL when the
alignment
- dnl argument is smaller than sizeof (void *).
+ dnl On macOS 11.1 and AIX 7.3.1, aligned_alloc returns NULL when the
+ dnl alignment argument is smaller than sizeof (void *).
AC_CACHE_CHECK([whether aligned_alloc works for small alignments],
[gl_cv_func_aligned_alloc_works],
[AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[#include <stdlib.h>
]],
- [[return aligned_alloc (2, 18) == NULL;
+ [[void *volatile p = aligned_alloc (2, 18);
+ return p == NULL;
]])
],
[gl_cv_func_aligned_alloc_works=yes],
