How to ignore gotvm when building ARM64 binaries

Question content

I want to build my go repository to ignore myrepo/ when goarch=arm64 gotvm/* and build the complete repository in any other case.

The project folder structure is as follows:

└── myrepo
    ├── go.mod
    ├── main.go
    ├── gotvm
    │   ├── array.go
    │   ├── device.go
    │   └── gotvm.go
    └── otherstuff
        └── otherstuff.go

Everything works fine when building on amd64:

goos=linux goarch=amd64 go build -o amdbuild main.go

Build based on arm64

goos=linux goarch=arm64 go build -o armbuild main.go

The following error occurs before the binary is created:

package command-line-arguments
    imports github.com/myrepo/gotvm: build constraints exclude all go files in /homedir/myrepo/gotvm

When I use package gotvm (array.go, device.go, gotvm.go) add the following lines to The same goes for the top of each file:

//go:build amd64
// +build amd64`

Other steps I tried:

• go clean -modcache
• Add the following build flags above all files belonging to package gotvm
(individually)

// go:build (darwin && cgo) || (linux && cgo)
//go:build amd64
// +build amd64`

There is a similar question here: (simulation package) , but this ignores the entire folder. I want to ignore folders if arch is not arm64.

tl;dr; Is there a way to cross compile my repository to arm64 and amd64? I want to ignore tvm in arm64 build.

Specification:

• go version: go1.20.4 linux/amd64
• System: ubuntu 20.04.5 lts

Correct answer

Adding a go file containing only the package clause to the gotvm folder can solve this problem. For example, doc.go file:

// this file is a workaround for the following issue when built with goarch=arm64:
//
//   build constraints exclude all go files in /homedir/myrepo/gotvm

package gotvm

But when you encounter this problem, most of the time, it means that there is at least one file that imports this package, and goarch=arm64 does not exclude this file. Maybe you should remove the imports from this file (or for goarch=arm64 exclude this file too).

I'll add a demo to illustrate the problem. These are the files:

├── go.mod
├── gotvm
│   └── gotvm.go
└── main.go

go.mod：

module example.com/m

go 1.20

gotvm/gotvm.go：

//go:build amd64

package gotvm

import "fmt"

func f() {
    fmt.println("do awesome things using amd64")
}

main.go：

package main

import (
    "fmt"

    _ "example.com/m/gotvm"
)

func main() {
    fmt.Println("Hello world!")
}

For this demo, remove _ "example.com/m/gotvm" from main.go or add the previously mentioned doc.go file will solve the problem. I think it would be better to remove _ "example.com/m/gotvm" from main.go.

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