Wasi target command flag vs environment variables #4439
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Description
My understanding is that setting GOOS=wasip1 GOARCH=wasm should produce identical output as passing the -target wasi command line flag, but it doesn't. Rather, it seem to match -target wasm.
Repro:
package main
func main() {
println("Hello, World!")
}You'll need wasm2wat from The WebAssembly Binary Toolkit.
Then:
- Compile the different ways. Optimizations off to see everything.
tinygo build -target wasi -opt 0 -o test1.wasm
tinygo build -target wasm -opt 0 -o test2.wasm
GOOS=wasip1 GOARCH=wasm tinygo build -opt 0 -o test3.wasm- Convert output to WAT format for readability
wasm2wat test1.wasm -o test1.wat
wasm2wat test2.wasm -o test2.wat
wasm2wat test3.wasm -o test3.watOpen each wat file in a text editor. Imports are near the top, exports are near the bottom.
test1.wat
...
(import "wasi_snapshot_preview1" "fd_write" (func $runtime.fd_write (type 4)))
(import "wasi_snapshot_preview1" "poll_oneoff" (func $runtime.poll_oneoff (type 4)))
(import "wasi_snapshot_preview1" "clock_time_get" (func $runtime.clock_time_get (type 16)))
...
(export "memory" (memory 0))
(export "malloc" (func $malloc))
(export "free" (func $free))
(export "calloc" (func $calloc))
(export "realloc" (func $realloc))
(export "_start" (func $_start))
(export "asyncify_start_unwind" (func 168))
(export "asyncify_stop_unwind" (func 169))
(export "asyncify_start_rewind" (func 170))
(export "asyncify_stop_rewind" (func 171))
(export "asyncify_get_state" (func 172))
...test2.wat / test3.wat
...
(import "gojs" "runtime.ticks" (func $runtime.ticks (type 15)))
(import "gojs" "runtime.sleepTicks" (func $runtime.sleepTicks (type 16)))
(import "wasi_snapshot_preview1" "fd_write" (func $runtime.fd_write (type 4)))
...
(export "memory" (memory 0))
(export "malloc" (func $malloc.command_export))
(export "free" (func $free.command_export))
(export "calloc" (func $calloc.command_export))
(export "realloc" (func $realloc.command_export))
(export "_start" (func $_start.command_export))
(export "resume" (func $resume.command_export))
(export "go_scheduler" (func $go_scheduler.command_export))
(export "asyncify_start_unwind" (func 175))
(export "asyncify_stop_unwind" (func 176))
(export "asyncify_start_rewind" (func 177))
(export "asyncify_stop_rewind" (func 178))
(export "asyncify_get_state" (func 179))
...They should be identical, but test3 is importing from gojs, and is also exporting go_scheduler. It's identical to test2, whereas I would expect it to match test1.