Bug #21092
Updated by jeremyd2019 (Jeremy Drake) about 1 month ago
While building from the release tarball ruby-3.4.1.tar.xz on cygwin (also confirmed in snapshot-master.tar.gz from Jan 27, 2025), I get the following error:
../ruby-3.4.1/ext/extmk.rb:279:in 'Array#-': no implicit conversion of nil into Array (TypeError)
from ../ruby-3.4.1/ext/extmk.rb:279:in 'Object#extmake'
from ../ruby-3.4.1/ext/extmk.rb:659:in 'block in <main>'
from ../ruby-3.4.1/ext/extmk.rb:653:in 'Array#each'
from ../ruby-3.4.1/ext/extmk.rb:653:in '<main>'
I have tracked this down to happening when an ext writes a dummy makefile. In this case, that ext is .bundle/gems/syslog-0.2.0.
See https://github.com/ruby/syslog/pull/16 for fixing why it is writing a dummy makefile to begin with, but still, it seems like extmk.rb should handle this case gracefully rather than breaking the build.