Go build模式

build mode: 用于指导编辑器如何创建可执行的二进制文件。越多的执行方式，就意味着可以让 Go 运行在更多的地方。

$go build -buildmode=default goroutine_select.go

在编译go程序时，go编译器支持如下几种模式：

-buildmode=archive
	Build the listed non-main packages into .a files. Packages named
	main are ignored.

-buildmode=c-archive
	Build the listed main package, plus all packages it imports,
	into a C archive file. The only callable(可调用的) symbols will be those
	functions exported using a cgo //export comment. Requires
	exactly one main package to be listed.

-buildmode=c-shared
	Build the listed main package, plus all packages it imports,
	into a C shared library. The only callable symbols will
	be those functions exported using a cgo //export comment.
	Requires exactly one main package to be listed.

-buildmode=default
	Listed main packages are built into executables and listed
	non-main packages are built into .a files (the default
	behavior).

-buildmode=shared
	Combine all the listed non-main packages into a single shared
	library that will be used when building with the -linkshared
	option. Packages named main are ignored.

-buildmode=exe
	Build the listed main packages and everything they import into
	executables. Packages not named main are ignored.

-buildmode=pie
	Build the listed main packages and everything they import into
	position independent executables (PIE). Packages not named
	main are ignored.

-buildmode=plugin
	Build the listed main packages, plus all packages that they
	import, into a Go plugin. Packages not named main are ignored.

解释：

exe:        静态编译
exe:        动态链接 libc
exe:        动态链接 libc 和非 Go 代码
pie:        地址无关的可执行文件(安全特性)
c-archive:  C 的静态链接库
c-shared:   C 的动态链接库
shared:     Go 的动态链接库
plugin:     Go 的插件