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Viewing file:     build_trimpath_cgo.txt (3.64 KB)      -rw-r--r--

# This test builds a cgo binary and verifies the source directory path
# does not appear in the binary, either literally or in compressed DWARF.
# TODO(golang.org/issue/36072): ideally we should build a binary from identical
# sources in different directories and verify the binary and all intermediate
# files are identical.

[short] skip
[!cgo] skip

# Check that the source path appears when -trimpath is not used.
go build -o hello.exe .
grep -q gopath[/\\]src hello.exe
go run ./list-dwarf hello.exe
stdout gopath[/\\]src

# Check that the source path does not appear when -trimpath is used.
[GOOS:aix] stop # can't inspect XCOFF binaries
go build -trimpath -o hello.exe .
! grep -q gopath[/\\]src hello.exe
go run ./list-dwarf hello.exe
! stdout gopath/src


# Do the above, with the cgo (but not .c) sources in an overlay
# Check that the source path appears when -trimpath is not used.
mkdir $WORK/overlay
cp hello.go $WORK/overlay/hello.go
mkdir hello_overlay
cp hello.c hello_overlay/hello.c
go build -overlay overlay.json -o hello_overlay.exe ./hello_overlay
grep -q gopath[/\\]src hello_overlay.exe
! grep -q $WORK[/\\]overlay hello_overlay.exe
go run ./list-dwarf hello_overlay.exe
stdout gopath[/\\]src
! stdout $WORK[/\\]overlay

# Check that the source path does not appear when -trimpath is used.
go build -overlay overlay.json -trimpath -o hello_overlay.exe ./hello_overlay
! grep -q gopath[/\\]src hello_overlay.exe
! grep -q $WORK[/\\]overlay hello_overlay.exe
go run ./list-dwarf hello_overlay.exe
! stdout gopath/src
! stdout $WORK[/\\]overlay

-- go.mod --
module m

go 1.14
-- overlay.json --
{
	"Replace": {
		"hello_overlay/hello.go": "../../overlay/hello.go"
	}
}
-- hello.c --
#include <stdio.h>

void say_hello() { puts("Hello, world!\n"); }

-- hello.go --
package main

// void say_hello();
import "C"

func main() {
	C.say_hello()
}

-- list-dwarf/list-dwarf.go --
package main

import (
	"debug/dwarf"
	"fmt"
	"io"
	"log"
	"os"
	"sort"
)

func main() {
	files, err := run(os.Args[1])
	if err != nil {
		log.Fatal(err)
	}
	for _, file := range files {
		fmt.Println(file)
	}
}

func run(exePath string) ([]string, error) {
	dwarfData, err := readDWARF(exePath)
	if err != nil {
		return nil, err
	}

	dwarfReader := dwarfData.Reader()
	files := make(map[string]bool)
	for {
		e, err := dwarfReader.Next()
		if err != nil {
			return nil, err
		}
		if e == nil {
			break
		}
		lr, err := dwarfData.LineReader(e)
		if err != nil {
			return nil, err
		}
		if lr == nil {
			continue
		}

		var le dwarf.LineEntry
		for {
			if err := lr.Next(&le); err != nil {
				if err == io.EOF {
					break
				}
				return nil, err
			}
			files[le.File.Name] = true
		}
	}

	sortedFiles := make([]string, 0, len(files))
	for file := range files {
		sortedFiles = append(sortedFiles, file)
	}
	sort.Strings(sortedFiles)
	return sortedFiles, nil
}
-- list-dwarf/read_darwin.go --
package main

import (
	"debug/dwarf"
	"debug/macho"
)

func readDWARF(exePath string) (*dwarf.Data, error) {
	machoFile, err := macho.Open(exePath)
	if err != nil {
		return nil, err
	}
	defer machoFile.Close()
	return machoFile.DWARF()
}
-- list-dwarf/read_elf.go --
// +build android dragonfly freebsd illumos linux netbsd openbsd solaris

package main

import (
	"debug/dwarf"
	"debug/elf"
)

func readDWARF(exePath string) (*dwarf.Data, error) {
	elfFile, err := elf.Open(exePath)
	if err != nil {
		return nil, err
	}
	defer elfFile.Close()
	return elfFile.DWARF()
}
-- list-dwarf/read_windows.go --
package main

import (
	"debug/dwarf"
	"debug/pe"
)

func readDWARF(exePath string) (*dwarf.Data, error) {
	peFile, err := pe.Open(exePath)
	if err != nil {
		return nil, err
	}
	defer peFile.Close()
	return peFile.DWARF()
}