An undocumented feature of the EDK2 build system prunes PCD entries from the
PCD database if no INF refers to them. This causes problems when PCD accesses
happen purely at runtime using generated PCD token numbers (i.e. the token
number is some form of 0x2000+X) or when PCD tokens are meant to be discovered
by searching through certain GUID (i.e. using GetNextToken() with a specific
GUID returns all PCDs associated with it). Currently, in order to work around
this, every time we create this type of PCD in the project's .dec fie, we must
also add it to an .inf.
I understand the value of auto-pruning. Currently INFs do not have a way to
disable references to PCDs that are not used because of feature flags. But
there needs to be some way to turn off this undocumented behavior.
Tim
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