在 OS X 下編譯 squashfs-tools

我的環境是 Snow Leopard, 不知道在比較新的版本是不是還是這樣。

參考了 Build squashfs tools for Mac OS X 這篇描述了編譯 4.0 版的方法，不過因為我想用 4.2 的版本，所以我是手動作就是。

大致上要解決的問題包含:

1. OS X 上未被定義的 FNM_EXTMATCH 常數
2. 改引入 sys/sysctl.h 以供 unsquashfs.c 取得 CPU 數量
3. OS X 上未被定義的一系列 l 開頭的 xattr 函數 (我猜應該也可以透過關閉 xattr 相關的功能避掉)

把 patch 丟到 Gist 上了，軟體跨平台真的是一件很藝術的事情。

	diff -rupN squashfs4.2/squashfs-tools/Makefile squashfs4.2-mac/squashfs-tools/Makefile
	--- squashfs4.2/squashfs-tools/Makefile 2011-03-01 04:04:15.000000000 +0800
	+++ squashfs4.2-mac/squashfs-tools/Makefile 2012-11-14 15:27:31.000000000 +0800
	@@ -104,7 +104,7 @@ UNSQUASHFS_OBJS = unsquashfs.o unsquash-
	CFLAGS ?= -O2
	CFLAGS += $(EXTRA_CFLAGS) $(INCLUDEDIR) -D_FILE_OFFSET_BITS=64 \
	-D_LARGEFILE_SOURCE -D_GNU_SOURCE -DCOMP_DEFAULT=\"$(COMP_DEFAULT)\" \
	- -Wall
	+ -DFNM_EXTMATCH=0 -Wall
	LIBS = -lpthread -lm
	ifeq ($(GZIP_SUPPORT),1)
	diff -rupN squashfs4.2/squashfs-tools/unsquashfs.c squashfs4.2-mac/squashfs-tools/unsquashfs.c
	--- squashfs4.2/squashfs-tools/unsquashfs.c 2011-03-01 06:27:06.000000000 +0800
	+++ squashfs4.2-mac/squashfs-tools/unsquashfs.c 2012-11-14 15:26:55.000000000 +0800
	@@ -29,7 +29,7 @@
	#include "compressor.h"
	#include "xattr.h"
	-#include <sys/sysinfo.h>
	+#include <sys/sysctl.h>
	#include <sys/types.h>
	struct cache *fragment_cache, *data_cache;
	diff -rupN squashfs4.2/squashfs-tools/unsquashfs_xattr.c squashfs4.2-mac/squashfs-tools/unsquashfs_xattr.c
	--- squashfs4.2/squashfs-tools/unsquashfs_xattr.c 2011-02-11 23:49:24.000000000 +0800
	+++ squashfs4.2-mac/squashfs-tools/unsquashfs_xattr.c 2012-11-14 15:28:25.000000000 +0800
	@@ -27,6 +27,9 @@
	#include <sys/xattr.h>
	+#define lsetxattr(f, nam, v, len, flags) (setxattr(f, nam, v, len, flags, XATTR_NOFOLLOW))
	+#define lremovexattr(f, nam) removexattr(f, nam, XATTR_NOFOLLOW)
	+
	extern int root_process;
	void write_xattr(char *pathname, unsigned int xattr)
	diff -rupN squashfs4.2/squashfs-tools/xattr.c squashfs4.2-mac/squashfs-tools/xattr.c
	--- squashfs4.2/squashfs-tools/xattr.c 2011-02-11 23:49:24.000000000 +0800
	+++ squashfs4.2-mac/squashfs-tools/xattr.c 2012-11-14 15:14:16.000000000 +0800
	@@ -36,6 +36,9 @@
	#include <stdlib.h>
	#include <sys/xattr.h>
	+#define llistxattr(f, buf, len) (listxattr(f, buf, len, XATTR_NOFOLLOW))
	+#define lgetxattr(f, nam, buf, len) (getxattr(f, nam, buf, len, 0, XATTR_NOFOLLOW))
	+
	#include "squashfs_fs.h"
	#include "squashfs_swap.h"
	#include "mksquashfs.h"

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