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dbeddfb0b2
If the use of the ruby namespace isn't prepended by `::` to make it
explicit that the global ruby namespace is referenced here, it can
clash with other non-global namespace named ruby, e.g.
```
// declaration
namespace myproject {
namespace ruby {
// my ruby classes
}
}
// implementation
using namespace myproject;
[...]
rb_define_method(...);
[...]
```
leads to the following error:
```
../ruby/choice.cc: In function 'void {anonymous}::do_register_choice()':
../ruby/choice.cc:342:9: error: reference to 'ruby' is ambiguous
342 | rb_define_method(c_choices, "each", RUBY_FUNC_CAST(&choices_each), 0);
| ^~~~~~~~~~~~~~~~
In file included from ../ruby/choice.cc:20:
../ruby/paludis_ruby.hh:53:15: note: candidates are: 'namespace paludis::ruby { }'
53 | namespace ruby
| ^~~~
In file included from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/backward/2/stdalign.h:23,
from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/defines.h:77,
from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/ruby.h:23,
from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby.h:38,
from ../ruby/paludis_ruby.hh:44,
from ../ruby/choice.cc:20:
/usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/internal/stdalign.h:92:11: note: 'namespace ruby { }'
92 | namespace ruby {
| ^~~~
In file included from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/internal/anyargs.h:83,
from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby/ruby.h:24,
from /usr/x86_64-pc-linux-gnu/include/ruby-3.0/ruby.h:38,
from ../ruby/paludis_ruby.hh:44,
from ../ruby/choice.cc:20:
../ruby/choice.cc:342:9: error: '::define' has not been declared
342 | rb_define_method(c_choices, "each", RUBY_FUNC_CAST(&choices_each), 0);
| ^~~~~~~~~~~~~~~~
../ruby/choice.cc:344:9: error: reference to 'ruby' is ambiguous
344 | rb_define_method(c_choices, "find_by_name_with_prefix", RUBY_FUNC_CAST(&choices_find_by_name_with_prefix), 1);
| ^~~~~~~~~~~~~~~~
```
|
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| .. | ||
| ruby | ||
| ruby.h | ||