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mention vendor directories

Constantine A. Murenin 2019-01-16 13:20:19 -06:00
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GOPATH.md

@ -48,6 +48,10 @@ As a result, if (from your repository project) you import a package that is in t
Even though the GOPATH may be a list of directories, it is generally sufficient to use a single GOPATH for all Go code on your machine. Since all packages retrieved with "go get" have a unique URL (and thus a unique path on disk), having more than one GOPATH is almost never necessary when building with the Go tool. Even though the GOPATH may be a list of directories, it is generally sufficient to use a single GOPATH for all Go code on your machine. Since all packages retrieved with "go get" have a unique URL (and thus a unique path on disk), having more than one GOPATH is almost never necessary when building with the Go tool.
### Use of `vendor` directories
Note that as of go 1.11, the `vendor` directories are only supported when `$PWD` is a subset of `GOPATH`; see issue 29670 and https://stackoverflow.com/questions/54140415/go-1-11-ignores-the-vendor-directory-the-errors-give-the-impression-the-direc/54156547#54156547.
## FAQ ## FAQ
### Why won't ` $GOPATH/src/cmd/mycmd/*.go ` build? ### Why won't ` $GOPATH/src/cmd/mycmd/*.go ` build?
When the go command is looking for packages, it always looks in ` $GOROOT ` first. This includes directories, so if it finds (as in the case above) a ` cmd/ ` directory in ` $GOROOT ` it won't proceed to look in any of the GOPATH directories. This prevents you from defining your own ` math/matrix ` package as well as your own ` cmd/mycmd ` commands. When the go command is looking for packages, it always looks in ` $GOROOT ` first. This includes directories, so if it finds (as in the case above) a ` cmd/ ` directory in ` $GOROOT ` it won't proceed to look in any of the GOPATH directories. This prevents you from defining your own ` math/matrix ` package as well as your own ` cmd/mycmd ` commands.