`brew config` spews `xcrun`-related errors and strange Java-related message

[chdiza]

• [x] Confirmed this is a problem with running a brew command and not brew installing or the post-install behaviour of one or more formulae? If it's a formulae-specific problem please file this issue at the relevant tap e.g. for Homebrew/homebrew-core https://github.com/Homebrew/homebrew-core/issues/new
• [x] Ran brew update and retried your prior step?
• [x] Ran brew doctor, fixed all issues and retried your prior step?
• [x] Ran brew config and brew doctor and included their output with your issue?

brew config is now showing the following:

xcrun: error: unable to find utility "gcc-4.0", not a developer tool or in PATH
xcrun: error: unable to find utility "gcc-4.2", not a developer tool or in PATH

Those same messages also appear occasionally when installing formulae.

Also, brew config is showing the rather unhelpful and probably unintentional:

Unable to find any JVMs matching version "(null)".

Doctor says I'm ready to brew.

The full brew config:

HOMEBREW_VERSION: 1.3.2-84-gf343aab
ORIGIN: https://github.com/Homebrew/brew
HEAD: f343aabd2e69c78ef6836db16a8fed20c305d343
Last commit: 35 minutes ago
Core tap ORIGIN: https://github.com/Homebrew/homebrew-core
Core tap HEAD: b901ac0cc87658912de712626ef086a2169507f1
Core tap last commit: 5 minutes ago
HOMEBREW_PREFIX: /usr/local
HOMEBREW_REPOSITORY: /usr/local/hb
HOMEBREW_CELLAR: /usr/local/Cellar
HOMEBREW_BOTTLE_DOMAIN: https://homebrew.bintray.com
CPU: quad-core 64-bit arrandale
Homebrew Ruby: 2.0.0-p648
xcrun: error: unable to find utility "gcc-4.0", not a developer tool or in PATH
xcrun: error: unable to find utility "gcc-4.2", not a developer tool or in PATH
Clang: 9.0 build 900
Git: 2.13.5 => /Applications/Xcode.app/Contents/Developer/usr/bin/git
Perl: /usr/bin/perl
Python: /usr/bin/python
Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
Unable to find any JVMs matching version "(null)".
Java: N/A
macOS: 10.12.6-x86_64
Xcode: 9.0
CLT: 9.0.0.0.1.1504363082
X11: N/A

[ilovezfs]

yes. see https://github.com/Homebrew/brew/pull/3174

[ilovezfs]

@chdiza this should be fixed now via #3173 which I just shipped.

[chdiza]

@ilovezfs Thanks for the fix and the quickness thereof.