brew upgrade go

$ xcode-select --install
xcode-select: error: command line tools are already installed, use "Software Update" to install updates
$ go get -u github.com/derekparker/delve/cmd/dlv

zhouhh@/Users/zhouhh $ brew install go-delve/delve/delve
Updating Homebrew...
==> Installing delve from go-delve/delve
==> Downloading https://github.com/derekparker/delve/archive/v1.0.0.tar.gz
Already downloaded: /Users/zhouhh/Library/Caches/Homebrew/delve-1.0.0.tar.gz
security: SecKeychainSearchCopyNext: The specified item could not be found in the keychain.
==> Generating dlv-cert
==> openssl req -new -newkey rsa:2048 -x509 -days 3650 -nodes -config dlv-cert.cfg -extensions codesign_reqext -batch -out dlv-cert.cer -keyout dlv-cert.key
==> [SUDO] Installing dlv-cert as root
==> sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain dlv-cert.cer
Last 15 lines from /Users/zhouhh/Library/Logs/Homebrew/delve/02.sudo:
2018-08-09 17:07:38 +0800
sudo
security
add-trusted-cert
-d
-r
trustRoot
-k
/Library/Keychains/System.keychain
dlv-cert.cer
If reporting this issue please do so at (not Homebrew/brew or Homebrew/core):
https://github.com/go-delve/homebrew-delve/issues
These open issues may also help:
Upgrade to delve fails https://github.com/go-delve/homebrew-delve/issues/20
/usr/local/Homebrew/Library/Homebrew/exceptions.rb:426:in `block in dump': undefined method `check_for_bad_install_name_tool' for #<Homebrew::Diagnostic::Checks:0x007fc5df858bd8> (NoMethodError)
Did you mean?  check_for_tap_ruby_files_locations
 from /usr/local/Homebrew/Library/Homebrew/exceptions.rb:425:in `each'
 from /usr/local/Homebrew/Library/Homebrew/exceptions.rb:425:in `dump'
 from /usr/local/Homebrew/Library/Homebrew/brew.rb:138:in `rescue in <main>'
 from /usr/local/Homebrew/Library/Homebrew/brew.rb:30:in `<main>'

zhouhh@/Users/zhouhh $ cd $HOME/Library/Caches/Homebrew
zhouhh@/Users/zhouhh/Library/Caches/Homebrew $ ls del*
delve-1.0.0.tar.gz
zhouhh@/Users/zhouhh/Library/Caches/Homebrew $ tar zxvf delve-1.0.0.tar.gz
zhouhh@/Users/zhouhh/Library/Caches/Homebrew $ sh delve-1.0.0/scripts/gencert.sh
Password:

zhouhh@/Users/zhouhh/Library/Caches/Homebrew $ CGO_ENABLED=1 brew install go-delve/delve/delve
==> Installing delve from go-delve/delve
==> Downloading https://github.com/derekparker/delve/archive/v1.0.0.tar.gz
Already downloaded: /Users/zhouhh/Library/Caches/Homebrew/delve-1.0.0.tar.gz
==> dlv-cert is already installed, no need to create it
==> make build BUILD_SHA=v1.0.0
==> Caveats
If you get "could not launch process: could not fork/exec", you need to try
in a new terminal.
When uninstalling, to remove the dlv-cert certificate, run this command:
    $ sudo security delete-certificate -t -c dlv-cert /Library/Keychains/System.keychain
Alternatively, you may want to delete from the Keychain (with the Imported private key).
==> Summary
🍺  /usr/local/Cellar/delve/1.0.0: 6 files, 10.6MB, built in 13 seconds

Help → Edit Custom Properties...

dlv.path=/usr/local/bin/dlv