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by Clint Adams
Import upstream version 1.9 |
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dnl @synopsis AX_FUNC_POSIX_MEMALIGN |
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dnl |
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dnl Some versions of posix_memalign (notably glibc 2.2.5) incorrectly |
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dnl apply their power-of-two check to the size argument, not the alignment |
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dnl argument. AX_FUNC_POSIX_MEMALIGN defines HAVE_POSIX_MEMALIGN if the |
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dnl power-of-two check is correctly applied to the alignment argument. |
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dnl |
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dnl @version $Id: $ |
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dnl @author Scott Pakin <pakin@uiuc.edu> |
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dnl
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AC_DEFUN([AX_FUNC_POSIX_MEMALIGN], |
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[AC_CACHE_CHECK([for working posix_memalign], |
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[ax_cv_func_posix_memalign_works], |
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[AC_TRY_RUN([ |
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#include <stdlib.h>
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int
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main ()
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{
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void *buffer;
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/* Some versions of glibc incorrectly perform the alignment check on
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* the size word. */
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exit (posix_memalign (&buffer, sizeof(void *), 123) != 0);
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}
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], |
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[ax_cv_func_posix_memalign_works=yes], |
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[ax_cv_func_posix_memalign_works=no], |
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[ax_cv_func_posix_memalign_works=no])]) |
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if test "$ax_cv_func_posix_memalign_works" = "yes" ; then |
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AC_DEFINE([HAVE_POSIX_MEMALIGN], [1], |
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[Define to 1 if `posix_memalign' works.]) |
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fi
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]) |