projects / ovs.git / blame
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|---|---|---|
| 3dc62a6c YT |
1 | # =========================================================================== |
| 2 | # http://www.gnu.org/software/autoconf-archive/ax_func_posix_memalign.html | |
| 3 | # =========================================================================== | |
| 4 | # | |
| 5 | # SYNOPSIS | |
| 6 | # | |
| 7 | # AX_FUNC_POSIX_MEMALIGN | |
| 8 | # | |
| 9 | # DESCRIPTION | |
| 10 | # | |
| 11 | # Some versions of posix_memalign (notably glibc 2.2.5) incorrectly apply | |
| 12 | # their power-of-two check to the size argument, not the alignment | |
| 13 | # argument. AX_FUNC_POSIX_MEMALIGN defines HAVE_POSIX_MEMALIGN if the | |
| 14 | # power-of-two check is correctly applied to the alignment argument. | |
| 15 | # | |
| 16 | # LICENSE | |
| 17 | # | |
| 18 | # Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu> | |
| 19 | # | |
| 20 | # Copying and distribution of this file, with or without modification, are | |
| 21 | # permitted in any medium without royalty provided the copyright notice | |
| 22 | # and this notice are preserved. This file is offered as-is, without any | |
| 23 | # warranty. | |
| 24 | ||
| 25 | #serial 7 | |
| 26 | ||
| 27 | AC_DEFUN([AX_FUNC_POSIX_MEMALIGN], | |
| 28 | [AC_CACHE_CHECK([for working posix_memalign], | |
| 29 | [ax_cv_func_posix_memalign_works], | |
| 30 | [AC_TRY_RUN([ | |
| 31 | #include <stdlib.h> | |
| 32 | ||
| 33 | int | |
| 34 | main () | |
| 35 | { | |
| 36 | void *buffer; | |
| 37 | ||
| 38 | /* Some versions of glibc incorrectly perform the alignment check on | |
| 39 | * the size word. */ | |
| 40 | exit (posix_memalign (&buffer, sizeof(void *), 123) != 0); | |
| 41 | } | |
| 42 | ], | |
| 43 | [ax_cv_func_posix_memalign_works=yes], | |
| 44 | [ax_cv_func_posix_memalign_works=no], | |
| 45 | [ax_cv_func_posix_memalign_works=no])]) | |
| 46 | if test "$ax_cv_func_posix_memalign_works" = "yes" ; then | |
| 47 | AC_DEFINE([HAVE_POSIX_MEMALIGN], [1], | |
| 48 | [Define to 1 if `posix_memalign' works.]) | |
| 49 | fi | |
| 50 | ]) |