为什么每次重建时go go二进制文件都会更改？

Question

Why does rerunning go build ./ on some projects yield different results each time?

For example:

$ cd go/src/github.com/google/cadvisor
$ go build ./
$ sh1sum cadvisor
cdfc3c38898e2decd5df35b661737f7cc4f514ed  cadvisor
$ go build ./
$ sha1sum cadvisor
a94db96d684225e7a45cc68c5341fe6f57897c23  cadvisor

Full isolated setup:

$ go version
go version go1.6.2 linux/amd64
$ export GOPATH=$(mktemp -d)
$ cd $GOPATH
$ go get github.com/tools/godep
$ go get github.com/google/cadvisor
package github.com/influxdb/influxdb/client: code in directory /tmp/tmp.2MxFdNmdDe/src/github.com/influxdb/influxdb/client expects import "github.com/influxdata/influxdb/client"
$ cd src/github.com/google/cadvisor
$ $GOPATH/bin/godep restore
godep: WARNING: Go version (go1.6) & $GO15VENDOREXPERIMENT= wants to enable the vendor experiment, but disabling because a Godep workspace (Godeps/_workspace) exists
$ go build ./
...

Answer 1

It's because you're using CGO, Go creates a tmp directory that gets used to compile the C code and the path gets embedded in the binary.

There was an issue about it but I can't find it now.

Issues 9206 and 13247.