How Do I Fix/Silence "Use new_tap/xxx instead of deprecated old_tap/xxx" Warnings?

[DabeDotCom]

I have a question...

After ce2b11f/#1371 went in, brew outdated (as well as brew uses --installed <formula> and maybe others) started spitting out a handful of, e.g.

Warning: use homebrew/dups/apple-gcc42 instead of homebrew/core/apple-gcc42

messages — which I understand is to allow third-party taps to migrate formulae into and out of core... (And yes, I'm heavily in favor of future-proofing!)

My problem, though, is: What do I have to do to "use" the new location instead? These formulae have been installed (and working fine!) forever...

brew info seems happy with the status quo:

prompt% brew info apple-gcc42
homebrew/dupes/apple-gcc42: stable 4.2.1-5666.3 (bottled)    ### <--
GNU compiler collection
https://r.research.att.com/tools/
/usr/local/Cellar/apple-gcc42/4.2.1-5666.3 (107 files, 74.7M) *
  Poured from bottle on 2013-09-26 at 14:52:37               ### <--
[...]

Do I have to manually install all these apps from the new, fully-scoped locations? When I try that, brew install and brew upgrade claim everything is already up-to-date:

prompt% brew install homebrew/dupes/apple-gcc42
Warning: homebrew/dupes/apple-gcc42-4.2.1-5666.3 already installed

prompt% brew upgrade homebrew/dupes/apple-gcc42
Error: homebrew/dupes/apple-gcc42 4.2.1-5666.3 already installed

So does that mean I have to uninstall the existing versions, first? (More importantly: SHOULD I have to?!)

Given that I didn't actually /explicitly/ list those formula names when running brew outdated, the fact that there's no clear instructions about how to rectify the situation makes these messages a little Less Than Awesome, IMHO. :-\

[MikeMcQuaid]

Thanks for the report. This is a bug and I'll work on a fix.

[MikeMcQuaid]

For now a brew reinstall apple-gcc42 should fix this for you.

[DabeDotCom]

I know it's going to void my warranty, but my hackish workaround was just to 'sed' the corresponding /usr/local/Cellar/**/INSTALL_RECEIPT.json files...

I HOMEBREW_BUILD_FROM_SOURCE=1 most things, and was feeling too impatient to sit through a half-a-dozen re-compiles. :-} (And I can easily undo it, if necessary...)

[MikeMcQuaid]

@DabeDotCom No worries, that's probably a sensible approach if you want to avoid reinstalling. Thanks!

[MikeMcQuaid]

PR opened in #1485.