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63 lines
1.3 KiB
Go
63 lines
1.3 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build go1.13
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// +build go1.13
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package template_test
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import (
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"bytes"
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"github.com/gohugoio/hugo/tpl/internal/go_templates/testenv"
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"os"
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"os/exec"
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"path/filepath"
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"testing"
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)
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// Issue 36021: verify that text/template doesn't prevent the linker from removing
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// unused methods.
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func _TestLinkerGC(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping in short mode")
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}
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testenv.MustHaveGoBuild(t)
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const prog = `package main
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import (
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_ "text/template"
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)
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type T struct{}
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func (t *T) Unused() { println("THIS SHOULD BE ELIMINATED") }
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func (t *T) Used() {}
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var sink *T
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func main() {
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var t T
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sink = &t
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t.Used()
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}
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`
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td := t.TempDir()
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if err := os.WriteFile(filepath.Join(td, "x.go"), []byte(prog), 0644); err != nil {
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t.Fatal(err)
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}
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cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "x.exe", "x.go")
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cmd.Dir = td
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if out, err := cmd.CombinedOutput(); err != nil {
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t.Fatalf("go build: %v, %s", err, out)
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}
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slurp, err := os.ReadFile(filepath.Join(td, "x.exe"))
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if err != nil {
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t.Fatal(err)
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}
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if bytes.Contains(slurp, []byte("THIS SHOULD BE ELIMINATED")) {
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t.Error("binary contains code that should be deadcode eliminated")
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}
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}
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