This commit is to add an extra option to enable verbose mode (V=1) in the
generated `Makefile` at runtime of the Ruby to print compiler command lines by
the commands below when building native extensions. It's possible to enable the
verbose mode by setting the environment variable `MAKEFLAGS="V=1"`[1]
implemented in GNU make. However, I wanted to make a consistent user-interface
not depending on the specific make's implementation.
```
$ ruby /path/to/extconf.rb -- --with-verbose
```
You can also add the extra option via rake-compiler gem.
```
$ rake compiler -- --with-verbose
```
If the extra option is not given, the value of the
`RbConfig::CONFIG["MKMF_VERBOSE"]` enabled by the configure option below is
used.
```
$ ./configure --enable-mkmf-verbose
```
For the unit tests, updated the following files.
* The `test/mkmf/test_configuration.rb` was created to test the cases with the
`configuration` method and this implementation.
* Updated the `TestMkmf#assert_separately` to set the extra
arguments in `test/mkmf/base.rb`. Updated tests using the `assert_separately`.
* Added tests for `MakeMakefile#with_config` in the `test/mkmf/test_config.rb`.
[1] https://www.gnu.org/software/make/manual/html_node/Variables_002fRecursion.html
Fixes [Bug #19695]
Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>
When you change this to true, you may need to add more tests.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53141 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* lib/mkmf.rb (try_cppflags, try_cflags, try_ldflags): get rid of
interference by modifying global variables in have_devel? method.
[ruby-core:67962] [Bug #10821]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49482 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
