It seems Bitbake build creates processes that print the actual build outputs to log files rather than standard output.
Is there a way to make them print to stdout? I need this to analyze a software with Coverity. Coverity captures the calls to the compiler from stdout to figure out which files to analyze and with what options they are built. With Bitbake it can't see a single compile command...
Coverity Static Analysis does not depend on anything being output to "standard output" to work. The issue you are seeing with BitBake is caused by environment variables that SA relies on to capture calls to the compiler being wiped clean by BitBake.
In order to resolve the problem you need to white list variables SA uses with BitBake (likely by setting BB_ENV_WHITELIST or equivalent appropriately).
I think BitBake may have a way to preserve the entire environment (setting BB_PRESERVE_ENV) however, I don't know if that may impact your native build so I would hesitate to suggest it.