// same compiler settings and can reuse each other's results.
// If not, the reason is already recorded in buildGcflags.
fmt.Fprintf(h, "compile\n")
- // Only include the package directory if it may affect the output.
- // We trim workspace paths for all packages when -trimpath is set.
- // The compiler hides the exact value of $GOROOT
- // when building things in GOROOT.
- // Assume b.WorkDir is being trimmed properly.
- // When -trimpath is used with a package built from the module cache,
- // use the module path and version instead of the directory.
- if !p.Goroot && !cfg.BuildTrimpath && !strings.HasPrefix(p.Dir, b.WorkDir) {
+
+ // Include information about the origin of the package that
+ // may be embedded in the debug info for the object file.
+ if cfg.BuildTrimpath {
+ // When -trimpath is used with a package built from the module cache,
+ // its debug information refers to the module path and version
+ // instead of the directory.
+ if p.Module != nil {
+ fmt.Fprintf(h, "module %s@%s\n", p.Module.Path, p.Module.Version)
+ }
+ } else if p.Goroot {
+ // The Go compiler always hides the exact value of $GOROOT
+ // when building things in GOROOT, but the C compiler
+ // merely rewrites GOROOT to GOROOT_FINAL.
+ if len(p.CFiles) > 0 {
+ fmt.Fprintf(h, "goroot %s\n", cfg.GOROOT_FINAL)
+ }
+ // b.WorkDir is always either trimmed or rewritten to
+ // the literal string "/tmp/go-build".
+ } else if !strings.HasPrefix(p.Dir, b.WorkDir) {
+ // -trimpath is not set and no other rewrite rules apply,
+ // so the object file may refer to the absolute directory
+ // containing the package.
fmt.Fprintf(h, "dir %s\n", p.Dir)
- } else if cfg.BuildTrimpath && p.Module != nil {
- fmt.Fprintf(h, "module %s@%s\n", p.Module.Path, p.Module.Version)
}
+
if p.Module != nil {
fmt.Fprintf(h, "go %s\n", p.Module.GoVersion)
}
--- /dev/null
+[short] skip
+[!cgo] skip
+
+# Set up fresh GOCACHE
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# 1. unset GOROOT_FINAL, Build a simple binary with cgo by origin go.
+# The DW_AT_comp_dir of runtime/cgo should have a prefix with origin goroot.
+env GOROOT_FINAL=
+# If using "go run", it is no debuginfo in binary. So use "go build".
+# And we can check the stderr to judge if the cache of "runtime/cgo"
+# was used or not.
+go build -o binary.exe
+exec ./binary.exe $TESTGO_GOROOT
+stdout 'cgo DW_AT_comp_dir is right in binary'
+
+
+# 2. GOROOT_FINAL will be changed, the runtime/cgo will be rebuild.
+env GOROOT_FINAL=$WORK/gorootfinal
+go build -x -o binary.exe
+stderr '(clang|gcc)( |\.exe).*gcc_.*\.c'
+exec ./binary.exe $GOROOT_FINAL
+stdout 'cgo DW_AT_comp_dir is right in binary'
+
+
+[!symlink] skip
+
+# Symlink the compiler to another path
+env GOROOT=$WORK/goroot
+symlink $GOROOT -> $TESTGO_GOROOT
+
+# 3. GOROOT_FINAL is same with 2, build with the other go
+# the runtime/cgo will not be rebuild.
+go build -x -o binary.exe
+! stderr '(clang|gcc)( |\.exe).*gcc_.*\.c'
+exec ./binary.exe $GOROOT_FINAL
+stdout 'cgo DW_AT_comp_dir is right in binary'
+
+
+# 4. unset GOROOT_FINAL, build with the other go
+# the runtime/cgo will be rebuild.
+env GOROOT_FINAL=
+go build -x -o binary.exe
+stderr '(clang|gcc)( |\.exe).*gcc_.*\.c'
+exec ./binary.exe $GOROOT
+stdout 'cgo DW_AT_comp_dir is right in binary'
+
+-- go.mod --
+module main
+
+go 1.18
+-- main.go --
+package main
+
+import "C"
+import (
+ "debug/dwarf"
+ "fmt"
+ "log"
+ "os"
+ "path/filepath"
+ "strings"
+)
+
+var _ C.int
+
+func main() {
+ dwarfData, err := readDWARF(os.Args[0])
+ if err != nil {
+ log.Fatal(err)
+ }
+ goroot := filepath.Join(os.Args[1], "src")
+ dwarfReader := dwarfData.Reader()
+ cgopackage := filepath.Join("runtime", "cgo")
+ var hascgo bool
+ for {
+ e, err := dwarfReader.Next()
+ if err != nil {
+ log.Fatal(err)
+ }
+ if e == nil {
+ break
+ }
+ field := e.AttrField(dwarf.AttrCompDir)
+ if field == nil {
+ continue
+ }
+ compdir := field.Val.(string)
+ if strings.HasSuffix(compdir, cgopackage) {
+ hascgo = true
+ if !strings.HasPrefix(compdir, goroot) {
+ fmt.Printf("cgo DW_AT_comp_dir %s contains incorrect path in binary.\n", compdir)
+ return
+ }
+ }
+ }
+ if hascgo {
+ fmt.Println("cgo DW_AT_comp_dir is right in binary")
+ } else {
+ fmt.Println("binary does not contain cgo")
+ }
+}
+-- 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()
+}
+-- 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()
+}
+-- 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()
+}