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ext2fs: fix undeclared posix_memalign() warning 

Older distros do not define posix_memalign() by default in the
headers.  If ext2fs.h is included early in the headers, it is
possible to "#define _XOPEN_SOURCE 600" so that the stdlib.h
header will define it, but if ext2fs.h is included after stdlib.h
there is no posix_memalign() declaration.

Add a posix_memalign() declaration if stdlib.h didn't do it.  This
is a bit of a hack for GNU headers, but it works on Linux and OS/X
without problems.

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
bitmap-optimize
Andreas Dilger 2011-06-11 11:04:42 -04:00 committed by Theodore Ts'o
parent cf5301d7f2
commit 1ac2aa23ef
1 changed files with 12 additions and 1 deletions
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13
lib/ext2fs/ext2fs.h
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@ -29,6 +29,10 @@ extern "C" {
#define NO_INLINE_FUNCS
#endif
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600 /* for posix_memalign() */
#endif
/*
* Where the master copy of the superblock is located, and how big
* superblocks are supposed to be. We define SUPERBLOCK_SIZE because
@ -37,7 +41,7 @@ extern "C" {
* 1032 bytes long).
*/
#define SUPERBLOCK_OFFSET 1024
#define SUPERBLOCK_SIZE 1024
#define SUPERBLOCK_SIZE 1024
/*
* The last ext2fs revision level that this version of the library is
@ -54,6 +58,13 @@ extern "C" {
#include <string.h>
#include <errno.h>
#ifndef __USE_XOPEN2K
/* If the "#define _XOPEN_SOURCE 600" didn't succeed in declaring
* posix_memalign(), maybe due to <features.h> or <stdlib.h> included beforej
* _XOPEN_SOURCE, declare it here to avoid compiler warnings. */
extern int posix_memalign(void **__memptr, size_t __alignment, size_t __size);
#endif
#if EXT2_FLAT_INCLUDES
#include "e2_types.h"
#include "ext2_fs.h"