英文:
Why does go's compiler "gc" use a different calling convention than C?
问题
C使用cdecl，我已经研究过并从汇编中调用过它。它感觉还不错，那为什么要破坏兼容性呢？为什么需要另一种约定？
英文:
C uses the cdecl, which I've looked into and called with from assembly. It feels well enough, so why break the compatibility? Why was another convention needed?
答案1
得分: 5
因为具有相同的调用约定没有优势。即使调用约定相同，Go代码和C代码也不能直接互相调用，因为Go使用了分割堆栈。
另一方面，在gccgo中这是有意义的，因为gcc支持某些架构的C分割堆栈。而且，据我所知，调用约定是因为兼容性的原因。（更多详细信息在这里。）
免责声明：我从未真正使用过gccgo。
英文:
Because there's no advantage in having the same calling convention. Go code and C code cannot call each other directly even when the calling convention would be the same because Go uses split stacks.
OTOH, it makes sense in gccgo, as gcc supports C split stacks for some architectures. And, IIRC, there the calling convention is because of that compatible. (More details here.)
Disclaimer: I didn't ever actually used gccgo.
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