`No acceptable C compiler found!` on macos 10.14 machines

[richardlau]

e.g. https://ci.nodejs.org/job/node-test-commit-osx/nodes=osx1014/48849/console

11:01:11 Detected C++ compiler (CXX=/usr/local/bin/ccache c++) version: 
11:01:11 WARNING: failed to autodetect C++ compiler version (CXX=/usr/local/bin/ccache c++)
11:01:11 Detected C compiler (CC=/usr/local/bin/ccache cc) version: 
11:01:11 WARNING: failed to autodetect C compiler version (CC=/usr/local/bin/ccache cc)
11:01:11 ERROR: No acceptable C compiler found!
11:01:11 
11:01:11        Please make sure you have a C compiler installed on your system and/or
11:01:11        consider adjusting the CC environment variable if you installed
11:01:11        it in a non-standard prefix.
11:01:11 make: *** [build-ci] Error 1

On the machine it looks like ccache is broken:

test-orka-macos10:~ administrator$ /usr/local/bin/ccache cc --version
-bash: /usr/local/bin/ccache: No such file or directory
test-orka-macos10:~ administrator$ cc --version
dyld: Library not loaded: /usr/local/opt/hiredis/lib/libhiredis.1.0.0.dylib
  Referenced from: /usr/local/opt/ccache/libexec/cc
  Reason: image not found
Abort trap: 6
test-orka-macos10:~ administrator$ which -a cc
/usr/local/opt/ccache/libexec/cc
/usr/bin/cc
test-orka-macos10:~ administrator$ /usr/local/opt/ccache/libexec/cc --version
dyld: Library not loaded: /usr/local/opt/hiredis/lib/libhiredis.1.0.0.dylib
  Referenced from: /usr/local/opt/ccache/libexec/cc
  Reason: image not found
Abort trap: 6
test-orka-macos10:~ administrator$ /usr/bin/cc --version
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.5.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
test-orka-macos10:~ administrator$

[richardlau]

I'm guessing that when we ran the playbook for #3085 to update to Java 17, the unchanged package tasks attempted to update ccache and somehow failed without failing the playbook run 😞.

[richardlau]

Further investigation shows that hiredis was installed via brew but was version 1.1.0 while ccache is looking for 1.0.0.
I've got ccache running again by reinstall hiredis at 1.0.0:

curl -O https://raw.githubusercontent.com/Homebrew/homebrew-core/1c96aa836eef2c8b1ea707e9415f5ff266e5da65/Formula/hiredis.rb
brew unlink hiredis
brew install ./hiredis.rb
brew link ccache

(As an aside, brew spews out warnings about not supporting mojave anymore -- we may be broken by design 😞.)

At least https://ci.nodejs.org/job/node-test-commit-osx/48880/nodes=osx1014/console is building 🤞.

[targos]

Sorry, that's probably my fault. I only verified java -version.