What's the best way to detect if CGO is enabled?

[twp...@gmail.com]

Whether CGO is enabled or not affects how reliable certain standard library functions are. For example, os/user.LookupGroupId is untrustworthy if CGO is not enabled (example 1, example 2).

I can use build flags and two separate source files to determine whether CGO is enabled or not, for example in this commit.

This feels like it should be part of runtime, like runtime.GOOS and runtime.GOARCH.

Is there a better way to determine whether CGO is enabled?

Cheers,

Tom

[Ian Lance Taylor]

Build tags are the best way.

Although it's true that the use of cgo affects of a few standard
library functions, it's not remotely as fundamental as GOOS and
GOARCH. There is a way to check--via build tags--so I'm not sure we
need another mechanism.

Ian