cmd/link: add debug print in hostobjCopy

In external linking mode, when the external linker fails to handle
something in a host object file, it usually reports the name of
the host object which is a copied file named 000NNN.o. This is
often not helpful to determine what file it is. Add some debug
print so at least in -v mode it is more helpful.

Change-Id: Ibe762bff6a25640d16ee0dc082736ba5161b7522
Reviewed-on: https://go-review.googlesource.com/c/go/+/458735
Reviewed-by: Than McIntosh <thanm@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
1 file changed
tree: d5a3087450d21c14bf7477bc7680095b5be4aca7
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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