mbackchain and -mno-backchain: These options control whether the address of the caller's frame is stored as so-called "backchain" pointer into the callee's stack frame.

mbackchain 和 -mno-backchain：这些选项控制调用方帧的地址是否作为 “backchain” 指针存储到被调用方的堆栈帧。

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It was designed as a graduated double row of rectangular-cut emeralds, extending a pear and circular-cut diamond fringe, joined by circular and pear-shaped diamond clusters to the circular-cut diamond double row backchain, mounted on platinum.

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