Failed to install on macOS via homebrew

[autonomousapps]

Describe the bug

I tried brew install github/gh/bh, and the result was (summarizing):

$ brew install github/gh/gh
Updating Homebrew...
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

...lots of updated formulae...

==> Tapping github/gh
Cloning into '/usr/local/Homebrew/Library/Taps/github/homebrew-gh'...
remote: Enumerating objects: 40, done.
remote: Counting objects: 100% (40/40), done.
remote: Compressing objects: 100% (32/32), done.
remote: Total 172 (delta 10), reused 0 (delta 0), pack-reused 132
Receiving objects: 100% (172/172), 30.59 KiB | 435.00 KiB/s, done.
Resolving deltas: 100% (43/43), done.
Tapped 1 formula (27 files, 61.6KB).
==> Installing gh from github/gh
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Error: An exception occurred within a child process:
  CompilerSelectionError: github/gh/gh cannot be built with any available compilers.
Install GNU's GCC:
  brew install gcc

I then tried to install gcc:

$ brew install gcc
Updating Homebrew...
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
Error: The following formula
  gcc
cannot be installed as binary package and must be built from source.
Install the Command Line Tools:
  xcode-select --install

This is annoying, since I don't use xcode (I'm an Android developer).

All that said, executing xcode-select --install and then brew install github/gh/gh does finally work.

Steps to reproduce the behavior

See above.

Expected vs actual behavior

I expect the install command to "just work", without troubleshooting or other commands needed.

Logs

See above.

[tierninho]

@autonomousapps Thanks for sharing and glad you got it figured it out. We are tracking this here #287 as we aim to update our docs soon.