英文:
Source missing function body, how is it compiling?
问题
在Go语言的源代码中，我看到一个没有任何函数体的函数声明。
https://github.com/golang/go/blob/master/src/math/log10.go#L9
func Log10(x float64) float64
但是当我尝试相同的操作时，它给我一个错误：missing function body for __。
https://play.golang.org/p/Ncp-0-8vHB
这在Go源代码中是如何工作的？我的意思是math包是如何编译的？这个源文件只是用于文档目的吗？
看起来Log10是log10的公共/暴露版本，但是在语言中没有"getter"约定或类似的东西，那么Log10的函数体在哪里声明的？
英文:
In the Go lang source code, I see a function declared without any body.
https://github.com/golang/go/blob/master/src/math/log10.go#L9
<!-- language: lang-go -->
func Log10(x float64) float64
But when I do the same it gives me an error: missing function body for __
https://play.golang.org/p/Ncp-0-8vHB
How is this working in the Go source code? I mean how is the math package compiling? Is this source file just for documentation purposes?
It seems like Log10 is a public/exposed version of log10, but there is no "getter" convention or anything like that in the language, so where is the body of Log10 declared???
答案1
得分: 5
这是在同一个包中的*.s文件中为各种架构定义的汇编代码。
根据规范：
> 函数声明可以省略函数体。这样的声明为在Go之外实现的函数（如汇编例程）提供了函数签名。
英文:
It is defined in assembly for various architectures in the *.s files located in the same package.
Per the spec:
> A function declaration may omit the body. Such a declaration provides the signature for a function implemented outside Go, such as an assembly routine.
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