cmd/internal/objfile: use pe.FileHeader.Machine to reliably determine GOARCH

Current peFile.goarch looks for symbols like "_rt0_386_windows" to
determine GOARCH. But "_rt0_386_windows" is not present in executables
built with cgo.

Use pe.FileHeader.Machine instead. This should work with any Windows
executable, not just with Go built executable.

Fixes #39682

Change-Id: Ie0ffce664f4b8b8fed69b2ecc482425b042a38d5
Run-TryBot: Alex Brainman <>
TryBot-Result: Gobot Gobot <>
Reviewed-by: Cherry Zhang <>
Reviewed-by: Emmanuel Odeke <>
3 files changed
tree: 3f3525ab5a650901fb5346699d7a17d6c5e6b958
  1. .gitattributes
  2. .github/
  3. .gitignore
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/

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