GO使用动态链接库（共享链接库）进行编译生成动态链接可执行文件 ...

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GO使用动态链接库（共享链接库）进行编译生成动态链接可执行文件 ...

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我们使用 go help buildmode 可以看到 go 可以以多种方式进行构建，默认使用静态链接库.

➜  src go help buildmode
The 'go build' and 'go install' commands take a -buildmode argument which
indicates which kind of object file is to be built. Currently supported values
are:

    -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 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.

GO buildmode

在macos上我们使用shared 模式，但是显示不支持，我们换成linux平台进行实验：

➜  src go install -buildmode=shared yxpkg 
-buildmode=shared not supported on darwin/amd64

创建libstd.so 库：

root@docker ~/go# go install -buildmode=shared std

创建yxpkg包的 so库：

root@docker ~/go# go install -buildmode=shared -linkshared yxpkg

编译 main.go 生成动态链接的可执行文件：

root@docker ~/g/src# go build -linkshared yaoxu.go

我们对比之前生成的静态链接的可执行文件：发现其可执行文件大小，相差很大；

root@docker ~/g/src# ll
total 1.9M
-rwxr-xr-x. 1 root root  22K Aug 29 17:17 yaoxu*
-rw-r--r--. 1 root root   87 Aug 29 16:57 yaoxu.go
drwxr-xr-x. 2 root root 4.0K Aug 29 16:27 yxpkg/
-rwxr-xr-x. 1 root root 1.9M Aug 29 16:57 yx_static*