go get fails with "fatal error: 'wasm.h' file not found" about wasmtime-go HOT 4 CLOSED

Confirmed my hunch: by setting up the local build environment in a checkout of wasmtime-go and putting that in the $GOPATH so that go finds it I can import wasmtime-go in other packages.

The steps were:

1. Setup local wasmtime checkout for building locally. End result should be that cargo build works and produces the wasmtime lib.
2. mkdir -p $GOPATH/src/github.com/bytecodealliance
3. cd $GOPATH/src/github.com/bytecodealliance
4. git clone https://github.com/bytecodealliance/wasmtime-go
5. cd wasmtime-go
6. ./ci/local.sh ~/path/to/local/wasmtime/checkout
7. go install .

from wasmtime-go.

Ah yes, so tagged releases have pre-built binaries checked in, but if you're using the master branch you'll need to use CGO_* env vars and will need to compile your own copy of libwasmtime.a (or download it)

from wasmtime-go.

I believe that you need to specify a version when you use go get, otherwise Go will download the tip of master (since there aren't any non v0 releases tagged).

Try this:
$ go get -u github.com/bytecodealliance/[email protected]

from wasmtime-go.

Thanks, that works! Note, though, that it doesn't work in the "old" $GOPATH-mode of go:

$ go get -u github.com/bytecodealliance/[email protected]
go: cannot use path@version syntax in GOPATH mode

But it works with go modules:

$ mkdir ~/tmp/test_wasmtime
$ cd ~/tmp/test_wasmtime                                                                                                                                              
$ go mod init test_wasmtime
go: creating new go.mod: module test_wasmtime
$ go get -u github.com/bytecodealliance/[email protected]
go: downloading github.com/bytecodealliance/wasmtime-go v0.16.1
# github.com/bytecodealliance/wasmtime-go
../../code/go/pkg/mod/github.com/bytecodealliance/[email protected]/module.go:7:14: warning: assigning to 'wasm_byte_t *' (aka 'char *') from 'uint8_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]
../../code/go/pkg/mod/github.com/bytecodealliance/[email protected]/module.go:14:14: warning: assigning to 'wasm_byte_t *' (aka 'char *') from 'uint8_t *' (aka 'unsigned char *') converts between pointers to integer types with different sign [-Wpointer-sign]

from wasmtime-go.