gccgo-静态vs-静态libgo

gccgo

的

-static

和

-static libgo

之间有什么区别？文档似乎没有真正阐明正在发生的事情：

• 使用

  -static libgo

  选项静态链接已编译的包
• 使用

  -static

  选项执行完全静态链接（gc编译器的默认设置）

---

-static libgo

是否仅静态链接

libgo.a

仅？当glibc库已满时，检查生成的ELF中的动态链接：

gc静态构建：

$ go build hello.go
$ readelf -d hello
There is no dynamic section in this file.

$ go build -compiler gccgo -gccgoflags '-static' hello.go
$ readelf -d hello
There is no dynamic section in this file.

默认情况下，gccgo根据libgo、libc等动态链接：

$ go build -compiler gccgo hello.go
$ readelf -d hello
Dynamic section at offset 0x36e0 contains 29 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libgo.so.5]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]

在可执行文件中烘焙libgo，但仍动态链接到libc和好友：

$ go build -compiler gccgo -gccgoflags '-static-libgo' hello.go
$ readelf -d hello
Dynamic section at offset 0x128068 contains 28 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libm.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libgcc_s.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2] 

静态链接所有内容：

$ go build hello.go
$ readelf -d hello
There is no dynamic section in this file.

$ go build -compiler gccgo -gccgoflags '-static' hello.go
$ readelf -d hello
There is no dynamic section in this file.

---

我认为-static将尝试静态链接所有内容，而-static libgo要么只对Go包进行链接，要么只静态链接libgo.a。