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Source file src/cmd/go/note_test.go

Documentation: cmd/go

  // Copyright 2015 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.
  
  package main_test
  
  import (
  	"go/build"
  	"runtime"
  	"testing"
  
  	"cmd/internal/buildid"
  )
  
  func TestNoteReading(t *testing.T) {
  	// cmd/internal/buildid already has tests that the basic reading works.
  	// This test is essentially checking that -ldflags=-buildid=XXX works,
  	// both in internal and external linking mode.
  	tg := testgo(t)
  	defer tg.cleanup()
  	tg.tempFile("hello.go", `package main; func main() { print("hello, world\n") }`)
  	const buildID = "TestNoteReading-Build-ID"
  	tg.run("build", "-ldflags", "-buildid="+buildID, "-o", tg.path("hello.exe"), tg.path("hello.go"))
  	id, err := buildid.ReadFile(tg.path("hello.exe"))
  	if err != nil {
  		t.Fatalf("reading build ID from hello binary: %v", err)
  	}
  	if id != buildID {
  		t.Fatalf("buildID in hello binary = %q, want %q", id, buildID)
  	}
  
  	switch {
  	case !build.Default.CgoEnabled:
  		t.Skipf("skipping - no cgo, so assuming external linking not available")
  	case runtime.GOOS == "openbsd" && runtime.GOARCH == "arm":
  		t.Skipf("skipping - external linking not supported, golang.org/issue/10619")
  	case runtime.GOOS == "plan9":
  		t.Skipf("skipping - external linking not supported")
  	}
  
  	tg.run("build", "-ldflags", "-buildid="+buildID+" -linkmode=external", "-o", tg.path("hello2.exe"), tg.path("hello.go"))
  	id, err = buildid.ReadFile(tg.path("hello2.exe"))
  	if err != nil {
  		t.Fatalf("reading build ID from hello binary (linkmode=external): %v", err)
  	}
  	if id != buildID {
  		t.Fatalf("buildID in hello binary = %q, want %q (linkmode=external)", id, buildID)
  	}
  
  	switch runtime.GOOS {
  	case "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
  		// Test while forcing use of the gold linker, since in the past
  		// we've had trouble reading the notes generated by gold.
  		err := tg.doRun([]string{"build", "-ldflags", "-buildid=" + buildID + " -linkmode=external -extldflags=-fuse-ld=gold", "-o", tg.path("hello3.exe"), tg.path("hello.go")})
  		if err != nil {
  			if tg.grepCountBoth("(invalid linker|gold|cannot find 'ld')") > 0 {
  				// It's not an error if gold isn't there. gcc claims it "cannot find 'ld'" if
  				// ld.gold is missing, see issue #22340.
  				t.Log("skipping gold test")
  				break
  			}
  			t.Fatalf("building hello binary: %v", err)
  		}
  		id, err = buildid.ReadFile(tg.path("hello3.exe"))
  		if err != nil {
  			t.Fatalf("reading build ID from hello binary (linkmode=external -extldflags=-fuse-ld=gold): %v", err)
  		}
  		if id != buildID {
  			t.Fatalf("buildID in hello binary = %q, want %q (linkmode=external -extldflags=-fuse-ld=gold)", id, buildID)
  		}
  	}
  }
  

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