go - `go build` 不必要地重建

Question

go build 和 go run 在我的一个小程序上非常慢(特别是 cgo 调用)。我想去缓存二进制文件，以便它只在源更新时重建。我会使用带有 % 规则的简单 Makefile，但语言设计者声称 Go 的构建支持不需要 Makefile。

我是否忽略了另一种选择？ Go 社区是否更喜欢另一种构建系统(可能是基于哈希的构建系统)来缓存和重用构建产品？

Answer 1

go build 和 go install 将很快(Go 1.10，2018 年第一季度)变得更快:参见 this thread和 this文档草稿。

The go command now maintains a cache of built packages and other small metadata (CL 68116 and CL 75473). The cache defaults to the operating system-defined user cache directory but can be moved by setting $GOCACHE.
Run "go env GOCACHE" to see the current effective setting. Right now the go command never deletes anything from the cache. If the cache gets too big, run "go clean -cache" instead of deleting the directory. That command will preserve the cache's log.txt file. In a few weeks I'll ask people to post their log.txt files to a Github issue so that we can evaluate cache size management approaches.

The main effect of the build cache is that commands like "go test" and "go build" run fast and do incremental builds always, reusing past build steps as aggressively as possible.
You do not have to use "go test -i" or "go build -i" or "go install" just to get fast incremental builds. We will not have to teach new users those workarounds anymore. Everything will just be fast.

请注意，go install 不会安装指定包的依赖项:请参阅“What does go build build?”。