github.com/megatontech/mynoteforgo@v0.0.0-20200507084910-5d0c6ea6e890/源码/cmd/link/internal/ld/ld_test.go (about)

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ld
     6  
     7  import (
     8  	"internal/testenv"
     9  	"io/ioutil"
    10  	"os"
    11  	"os/exec"
    12  	"strings"
    13  	"testing"
    14  )
    15  
    16  func TestUndefinedRelocErrors(t *testing.T) {
    17  	t.Parallel()
    18  	testenv.MustHaveGoBuild(t)
    19  	dir, err := ioutil.TempDir("", "go-build")
    20  	if err != nil {
    21  		t.Fatal(err)
    22  	}
    23  	defer os.RemoveAll(dir)
    24  
    25  	out, err := exec.Command(testenv.GoToolPath(t), "build", "./testdata/issue10978").CombinedOutput()
    26  	if err == nil {
    27  		t.Fatal("expected build to fail")
    28  	}
    29  
    30  	wantErrors := map[string]int{
    31  		// Main function has dedicated error message.
    32  		"function main is undeclared in the main package": 1,
    33  
    34  		// Single error reporting per each symbol.
    35  		// This way, duplicated messages are not reported for
    36  		// multiple relocations with a same name.
    37  		"main.defined1: relocation target main.undefined not defined": 1,
    38  		"main.defined2: relocation target main.undefined not defined": 1,
    39  	}
    40  	unexpectedErrors := map[string]int{}
    41  
    42  	for _, l := range strings.Split(string(out), "\n") {
    43  		if strings.HasPrefix(l, "#") || l == "" {
    44  			continue
    45  		}
    46  		matched := ""
    47  		for want := range wantErrors {
    48  			if strings.Contains(l, want) {
    49  				matched = want
    50  				break
    51  			}
    52  		}
    53  		if matched != "" {
    54  			wantErrors[matched]--
    55  		} else {
    56  			unexpectedErrors[l]++
    57  		}
    58  	}
    59  
    60  	for want, n := range wantErrors {
    61  		switch {
    62  		case n > 0:
    63  			t.Errorf("unmatched error: %s (x%d)", want, n)
    64  		case n < 0:
    65  			t.Errorf("extra errors: %s (x%d)", want, -n)
    66  		}
    67  	}
    68  	for unexpected, n := range unexpectedErrors {
    69  		t.Errorf("unexpected error: %s (x%d)", unexpected, n)
    70  	}
    71  }