tinygo cgo compile error

[halfrost]

hen I use tinygo to compile wasm plugin:

$ tinygo build -o main.wasm -scheduler=none -target=wasi main.go

compile error. The error log is:

# os/user
../../../../opt/Cellar/go/1.17.2/libexec/src/os/user/cgo_lookup_unix.go:21:6: not implemented: build constraints in #cgo line
../../../../opt/Cellar/go/1.17.2/libexec/src/os/user/cgo_lookup_unix.go:24:10: fatal: 'pwd.h' file not found
../../../../opt/Cellar/go/1.17.2/libexec/src/os/user/getgrouplist_unix.go:15:10: fatal: 'grp.h' file not found

Once I disabled the cgo compile parameters,

$ CGO_ENABLED=0 tinygo build -o main.wasm -scheduler=none -target=wasi main.go

The error log is:

# github.com/cespare/xxhash/v2
../../pkg/mod/github.com/cespare/xxhash/v2@v2.1.1/xxhash_unsafe.go:32:11: cannot use len(s) (value of type int) as uintptr value in assignment
../../pkg/mod/github.com/cespare/xxhash/v2@v2.1.1/xxhash_unsafe.go:33:11: cannot use len(s) (value of type int) as uintptr value in assignment
../../pkg/mod/github.com/cespare/xxhash/v2@v2.1.1/xxhash_unsafe.go:43:11: cannot use len(s) (value of type int) as uintptr value in assignment
../../pkg/mod/github.com/cespare/xxhash/v2@v2.1.1/xxhash_unsafe.go:44:11: cannot use len(s) (value of type int) as uintptr value in assignment

My dependencies include prometheus and etcd. Both of their dependencies include xxhash. Is there any good idea?

[dgryski]

Try building with -tags=appengine to get a safe version of xxhash.

[halfrost]

@dgryski I try this command:

CGO_ENABLED=0 tinygo build -o main.wasm -scheduler=none -tags=appengine -target=wasi main.go

But still error:

# github.com/golang/protobuf/proto
../../pkg/mod/github.com/golang/protobuf@v1.4.3/proto/registry.go:230:16: MapOf not declared by package reflect

[dgryski]

Yup, that's a current limitation of the reflect package. There are patches in progress to fix that, but otherwise no timeline for getting them merged.

[halfrost]

OK, I'll keep an eye on your patch. You can add a tag to this issue with the patch you mentioned.

[cross-hello]

@dgryski same problem here. https://github.com/XTLS/Xray-core/issues/1473#issuecomment-1367775901