MakeMakefile#log_src

# File tmp/rubies/ruby-3.4.1/lib/mkmf.rb, line 472
  def log_src(src, heading="checked program was")
    src = src.split(/^/)
    fmt = "%#{src.size.to_s.size}d: %s"
    Logging::message <<"EOM"
#{heading}:
/* begin */
EOM
    src.each_with_index {|line, no| Logging::message fmt, no+1, line}
    Logging::message <<"EOM"
/* end */

EOM
  end