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author | Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com> | 2020-12-03 13:50:17 +0100 |
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committer | Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com> | 2021-02-18 14:11:48 +0100 |
commit | cf3e077da304e6f4d7c22f8296e1382335d055c6 (patch) | |
tree | dbcec1614cc8e8de56921f4a316fd316dee07f67 /tpl/internal/go_templates/texttemplate/link_test.go | |
parent | 66beac99c64b5e5fe7bec0bda437ba5858d49a36 (diff) |
tpl/internal: Synch Go templates fork with Go 1.16dev
Diffstat (limited to 'tpl/internal/go_templates/texttemplate/link_test.go')
-rw-r--r-- | tpl/internal/go_templates/texttemplate/link_test.go | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/tpl/internal/go_templates/texttemplate/link_test.go b/tpl/internal/go_templates/texttemplate/link_test.go new file mode 100644 index 000000000..3db8c21e3 --- /dev/null +++ b/tpl/internal/go_templates/texttemplate/link_test.go @@ -0,0 +1,66 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// +build go1.13 + +package template_test + +import ( + "bytes" + "github.com/gohugoio/hugo/tpl/internal/go_templates/testenv" + "io/ioutil" + "os" + "os/exec" + "path/filepath" + "testing" +) + +// Issue 36021: verify that text/template doesn't prevent the linker from removing +// unused methods. +func _TestLinkerGC(t *testing.T) { + if testing.Short() { + t.Skip("skipping in short mode") + } + testenv.MustHaveGoBuild(t) + const prog = `package main + +import ( + _ "text/template" +) + +type T struct{} + +func (t *T) Unused() { println("THIS SHOULD BE ELIMINATED") } +func (t *T) Used() {} + +var sink *T + +func main() { + var t T + sink = &t + t.Used() +} +` + td, err := ioutil.TempDir("", "text_template_TestDeadCodeElimination") + if err != nil { + t.Fatal(err) + } + defer os.RemoveAll(td) + + if err := ioutil.WriteFile(filepath.Join(td, "x.go"), []byte(prog), 0644); err != nil { + t.Fatal(err) + } + cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", "x.exe", "x.go") + cmd.Dir = td + if out, err := cmd.CombinedOutput(); err != nil { + t.Fatalf("go build: %v, %s", err, out) + } + slurp, err := ioutil.ReadFile(filepath.Join(td, "x.exe")) + if err != nil { + t.Fatal(err) + } + if bytes.Contains(slurp, []byte("THIS SHOULD BE ELIMINATED")) { + t.Error("binary contains code that should be deadcode eliminated") + } +} |