OpenWrt中的FEATURES:=broken jffs2

target/linux/goldfish中有：

FEATURES:=broken

（这个参数在make menuconfig 中 [*] Advanced configuration options (for developers)  --->[ *]   Show broken platforms / packages）

或者其他的如：

FEATURES:=jffs2 squashfs

scripts/metadata.pl中有  关于FEATURES的定义：

1 利用这个perl脚本可以把下面的如jffs2，broken这些转化为BROKEN，USES_JFFS2这些实际的CONFIG_参数。

2 同时注意区别depends BROKEN  和 select USES_JFFS2，这也就是为什么FEATURES:=broken的效果和FEATURES:=jffs2不一样的原因！

sub target_config_features(@) {
	my $ret;

	while ($_ = shift @_) {
		/broken/ and $ret .= "\tdepends BROKEN\n";
		/audio/ and $ret .= "\tselect AUDIO_SUPPORT\n";
		/display/ and $ret .= "\tselect DISPLAY_SUPPORT\n";
		/gpio/ and $ret .= "\tselect GPIO_SUPPORT\n";
		/pci/ and $ret .= "\tselect PCI_SUPPORT\n";
		/pcie/ and $ret .= "\tselect PCIE_SUPPORT\n";
		/usb/ and $ret .= "\tselect USB_SUPPORT\n";
		/pcmcia/ and $ret .= "\tselect PCMCIA_SUPPORT\n";
		/squashfs/ and $ret .= "\tselect USES_SQUASHFS\n";
		/jffs2/ and $ret .= "\tselect USES_JFFS2\n";
		/ext2/ and $ret .= "\tselect USES_EXT2\n";
		/targz/ and $ret .= "\tselect USES_TARGZ\n";
		/cpiogz/ and $ret .= "\tselect USES_CPIOGZ\n";
		/ubifs/ and $ret .= "\tselect USES_UBIFS\n";
		/fpu/ and $ret .= "\tselect HAS_FPU\n";
		/ramdisk/ and $ret .= "\tselect USES_INITRAMFS\n";
		/powerpc64/ and $ret .= "\tselect powerpc64\n";
		/nommu/ and $ret .= "\tselect NOMMU\n";
	}
	return $ret;
}