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A malloc library is expected to provide a better implementation using the knowledge of its internal details. ax_func_posix_memalign.m4 was obtained from: http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_func_posix_memalign.m4 Acked-by: Ben Pfaff <blp@nicira.com> Signed-off-by: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_func_posix_memalign.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_FUNC_POSIX_MEMALIGN
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#
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# DESCRIPTION
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#
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# Some versions of posix_memalign (notably glibc 2.2.5) incorrectly apply
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# their power-of-two check to the size argument, not the alignment
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# argument. AX_FUNC_POSIX_MEMALIGN defines HAVE_POSIX_MEMALIGN if the
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# power-of-two check is correctly applied to the alignment argument.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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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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])
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