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Randomized feature enable/disable might be something we use to help users debug any problems with changed loop variable capture, and there's another CL that would like to use it to help in locating places where "fused" multiply add instructions change program behavior. This CL: - adds the ability to include an integer parameter (e.g. line number) - replumbed the environment variable into a flag to simplify go build cache management - but added an environment variable to allow flag setting through the environment - which adds the possibility of switching on a different variable (if there's one built-in for variable capture, it shouldn't be GOSSAHASH) - cleaned up the checking code - adds tests for all the intended behavior - removes the case for GSHS_LOGFILE; TBD whether we'll need to put that back or if there is another way. Change-Id: I8503e1bb3dbc4a743aea696e04411ea7ab884787 Reviewed-on: https://go-review.googlesource.com/c/go/+/443063 Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Keith Randall <khr@golang.org> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> Run-TryBot: David Chase <drchase@google.com> |
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Vendoring in std and cmd ======================== The Go command maintains copies of external packages needed by the standard library in the src/vendor and src/cmd/vendor directories. In GOPATH mode, imports of vendored packages are resolved to these directories following normal vendor directory logic (see golang.org/s/go15vendor). In module mode, std and cmd are modules (defined in src/go.mod and src/cmd/go.mod). When a package outside std or cmd is imported by a package inside std or cmd, the import path is interpreted as if it had a "vendor/" prefix. For example, within "crypto/tls", an import of "golang.org/x/crypto/cryptobyte" resolves to "vendor/golang.org/x/crypto/cryptobyte". When a package with the same path is imported from a package outside std or cmd, it will be resolved normally. Consequently, a binary may be built with two copies of a package at different versions if the package is imported normally and vendored by the standard library. Vendored packages are internally renamed with a "vendor/" prefix to preserve the invariant that all packages have distinct paths. This is necessary to avoid compiler and linker conflicts. Adding a "vendor/" prefix also maintains the invariant that standard library packages begin with a dotless path element. The module requirements of std and cmd do not influence version selection in other modules. They are only considered when running module commands like 'go get' and 'go mod vendor' from a directory in GOROOT/src. Maintaining vendor directories ============================== Before updating vendor directories, ensure that module mode is enabled. Make sure GO111MODULE=off is not set ('on' or 'auto' should work). Requirements may be added, updated, and removed with 'go get'. The vendor directory may be updated with 'go mod vendor'. A typical sequence might be: cd src go get -d golang.org/x/net@latest go mod tidy go mod vendor Use caution when passing '-u' to 'go get'. The '-u' flag updates modules providing all transitively imported packages, not only the module providing the target package. Note that 'go mod vendor' only copies packages that are transitively imported by packages in the current module. If a new package is needed, it should be imported before running 'go mod vendor'.