It's hard and really expensive, I don't think any big company would like to do that. For large shops, source code building is non-trivial. It may require propri

It's hard and really expensive, I don't think any big company would like to do that. For large shops, source code building is non-trivial. It may require proprietary toolchains, metadata stored in some other dbs, or specific hardware / environments. And the toolchain may even not work outside the shop, e.g., depending on internal infras.