Imported http://autoconf-archive.cryp.to/ release 2007-02-14.

1 files changed, 50 insertions, 0 deletions

diff --git a/m4/ax_func_posix_memalign.m4 b/m4/ax_func_posix_memalign.m4
new file mode 100644
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--- /dev/null
+++ b/m4/ax_func_posix_memalign.m4
@@ -0,0 +1,50 @@
+##### http://autoconf-archive.cryp.to/ax_func_posix_memalign.html
+#
+# SYNOPSIS
+#
+#   AX_FUNC_POSIX_MEMALIGN
+#
+# DESCRIPTION
+#
+#   Some versions of posix_memalign (notably glibc 2.2.5) incorrectly
+#   apply their power-of-two check to the size argument, not the
+#   alignment argument. AX_FUNC_POSIX_MEMALIGN defines
+#   HAVE_POSIX_MEMALIGN if the power-of-two check is correctly applied
+#   to the alignment argument.
+#
+# LAST MODIFICATION
+#
+#   2005-01-22
+#
+# COPYLEFT
+#
+#   Copyright (c) 2005 Scott Pakin <pakin@uiuc.edu>
+#
+#   Copying and distribution of this file, with or without
+#   modification, are permitted in any medium without royalty provided
+#   the copyright notice and this notice are preserved.
+
+AC_DEFUN([AX_FUNC_POSIX_MEMALIGN],
+[AC_CACHE_CHECK([for working posix_memalign],
+  [ax_cv_func_posix_memalign_works],
+  [AC_TRY_RUN([
+#include <stdlib.h>
+
+int
+main ()
+{
+  void *buffer;
+
+  /* Some versions of glibc incorrectly perform the alignment check on
+   * the size word. */
+  exit (posix_memalign (&buffer, sizeof(void *), 123) != 0);
+}
+    ],
+    [ax_cv_func_posix_memalign_works=yes],
+    [ax_cv_func_posix_memalign_works=no],
+    [ax_cv_func_posix_memalign_works=no])])
+if test "$ax_cv_func_posix_memalign_works" = "yes" ; then
+  AC_DEFINE([HAVE_POSIX_MEMALIGN], [1],
+    [Define to 1 if `posix_memalign' works.])
+fi
+])