Issue #19695 has been updated by jaruga (Jun Aruga).

$ rake compiler -- --with-verbose

Sorry for my typo in the commit message. It's not "rake compiler" but "rake compile". ``` $ rake compile -- --with-verbose ``` ---------------------------------------- Feature #19695: mkmf: Adding the extra option --with-verbose to enable verbose mode. https://bugs.ruby-lang.org/issues/19695#change-103341 * Author: jaruga (Jun Aruga) * Status: Closed * Priority: Normal ---------------------------------------- I want the new feature to enable the verbose mode by setting the `V = 1` in the generated `Makefile` at runtime when building native extensions. Because the `V = 1` prints the compiler command lines. And it's useful to confirm and update the compiler flags. It can be used like the command below. ``` $ ruby /path/to/extconf.rb -- --with-verbose $ grep '^V =' Makefile V = 1 ``` Or it can be used with `rake-compiler` gem. ``` $ rake compile -- --with-verbose ``` The pull-request is <https://github.com/ruby/ruby/pull/7863>. -- https://bugs.ruby-lang.org/