trace: support BSD version of sed in gen.bash

The GNU version of sed (common on Linux) will modify files in place when
it sees the -i flag with no argument at all, as in [sed -i -e '...'].
The BSD version of sed (common on macOS) will modify files in place when
it's given an explicit zero-length argument, as in [sed -i '' -e '...'].

But they agree on at least one way of specifying a non-zero-length
backup suffix, [sed -i '.tmp' -e '...']. Use that and then delete the

In addition, change the expressions we pass to sed to make them a bit
more explicit and to require less escaping.

Fixes golang/go#68403

Change-Id: Icfc3863f4abe26bc77d9c0bc3b778067db6387de
Reviewed-by: Michael Knyszek <>
Reviewed-by: Carlos Amedee <>
LUCI-TryBot-Result: Go LUCI <>
Auto-Submit: Rhys Hiltner <>
Reviewed-by: Mauri de Souza Meneguzzo <>
1 file changed
tree: 7fe9572cad04a31a69d59355d218468c75e1382d
  1. apidiff/
  2. cmd/
  3. constraints/
  4. ebnf/
  5. ebnflint/
  6. errors/
  7. event/
  8. inotify/
  9. io/
  10. jsonrpc2/
  11. maps/
  12. mmap/
  13. rand/
  14. shiny/
  15. shootout/
  16. slices/
  17. slog/
  18. sumdb/
  19. trace/
  20. typeparams/
  21. utf8string/
  22. .gitattributes
  23. .gitignore
  24. codereview.cfg
  26. go.mod
  27. go.sum



This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.