debug symbols for extensions (apcu particularly)?

[mente]

We have a problem with apcu, resulting in segfault (details can be found here krakjoe/apcu#207). There's a core dump available but without debug symbols for apcu it's pretty hard to debug it for maintainer. php7.0-dbg is installed and latest version but it doesn't contain apcu debug symbols (though there are some available).

Trying to compile apcu from source and use it results in not all debug symbols being loaded (check issue mentioned above).

So my question is there any way to have debug symbols for extensions as well?

[matikij]

this enables -dbg package build for apcu: gplessis/dotdeb-apcu#2