Actually bug 32919 matters, it breaks Demlo and all packages that depend on
packages that need special compilation flags (e.g. -tags "xyz").

Concretely, say A depends on B and B must be built with "-tags xyz".
When packaging B, we produce a pkg.
If we try to package A _without the tags flag_, since B is not re-used, Go will
rebuild B without the flag which will not produce the desired result.

The most obvious workaround is to pass the right flags to A.  But if A needs
different flags, then we are stuck.

Conclusion: we need to update the build system! :D

-- 
Pierre Neidhardt
https://ambrevar.xyz/