Environ not declared by package syscall

[inkeliz]

I'm trying to test tinygo build -o wasm.wasm -target wasm . on tinygo version 0.21.0 windows/amd64 (using go version go1.17.1 and LLVM version 11.0.0), but gives:

# internal/syscall/execenv
C:\Program Files\Go\src\internal\syscall\execenv\execenv_default.go:19:17: Environ not declared by package syscall

[inkeliz]

That was cause by os.Exec, that was used on Windows and not proper set +build !js. However, I expect that os.Exec act as no-op.

[niaow]

Right now, TinyGo does not support os/exec at all yet. It is one of the more complex packages to support, since it depends on a lot of functionality which has not been implemented yet (e.g. concurrent I/O). It might be reasonable to add a not supported stub for now.

[niaow]

Related issue #632