Skip to main content

Build WASM

Build for Browsers​

with go​

Build WebAssembly using go command.
Following two files are used in this section.

  • prime.go
  • main_go.go

Set the environmental variables for targeting.

set target
// Windows
set GOOS=js
set GOARCH=wasm

// Linux
GOOS=js
GOARCH=wasm

Build WebAssembly with command

build for browsers with go
go build -o prime.wasm -tags=release -ldflags="-s -w" src/main_go.go src/prime.go

These command generate prime.wasm.
JavaScript should be fetched from ${GOROOT}/misc/wasm/wasm_exec.js.
(js is renamed to wasm_exec_go.js in this repository)

caution

select wasm_exec_go.js in index.html before running on browser

go/index.html
loading...

with tinygo​

Build WebAssembly using tinygo.
Following two files are used in this section.

  • prime.go
  • main_tinygo.go

Before build, we need to uncomment main() function for build.

go/pkg/prime.go
loading...

Let's build WebAssembly with this command.

build for browsers with tinygo
tinygo build -opt=2 -wasm-abi=generic -target=wasm -tags=release -o prime.wasm src/prime.go

These command generate prime.wasm.
JavaScript should be fetched from ${TINYGOROOT}/targets/wasm_exec.js.
(js is renamed to wasm_exec_tinygo.js in this repository)

caution

select wasm_exec_tinygo.js in index.html before running on browser

go/index.html
loading...

Build for Standalone​

with tinygo​

Building go program to standalone wasm is not currently supported by go command.
So, tinygo is used here.
Make sure tinygo is installed. Binaries can be downloaded at github releases.

Before build, main() function have to be uncommented.

go/src/prime.go
loading...
build with minimal
tinygo build -wasm-abi=generic -target=wasi -o prime_standalone.wasm src/prime.go
build with optimize options
tinygo build -opt=2 -wasm-abi=generic -target=wasi -tags=release -o prime_standalone.wasm src/prime.go

Those commands generate prime_standalone.wasm.

When using WAVM runtime, uncomment print_prime() function and build WebAssembly with

build for WAVM runtime
tinygo build -wasm-abi=generic -target=wasi -o print_prime_standalone.wasm src/prime.go

This generate print_prime_standalone.wasm.