Stop generating `build/<build>/src/*.pi.d`.
MODIFY
lib/mruby/build/command.rb
lib/mruby/build/command.rb
@@ -92,7 +92,7 @@ module MRuby
opts = compile_options
else
label = "CPP"
- opts = preprocess_options
+ opts = preprocess_options.gsub(/-MMD -MF .* -o/, "-o")
flags << " -DMRB_PRESYM_SCANNING"
end
_pp label, infile.relative_path, outfile.relative_path

Stop generating `build/<build>/src/*.pi.d`.