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https://bugzilla.tianocore.org/show_bug.cgi?id=1895 Build cache cannot store cache for the same library modules in different arch together. E.g. Both the below IA32 and X64 arch BaseLib caches should exist after build Ovmf3264, but now only the one in X64 arch exist. The reason is the current Basetool use a set() to same all library AutoGen objects, but the different arch lib AutoGen objects have same __hash_ value which comes from the lib MetaFile(The path of module file): def __hash__(self): return hash(self.MetaFile) So the different arch lib AutoGen objects are duplicated one to the set() and only one can exist. This is why the Basetool can only store one arch cache for library. This patch adds the arch string into the PlatformAutoGen and ModuleAutoGen __hash_ definitions and ensure the different platform and module AutoGen objects have different __hash_ values. Cc: Liming Gao <liming.gao@intel.com> Cc: Bob Feng <bob.c.feng@intel.com> Cc: Christian Rodriguez <christian.rodriguez@intel.com> Signed-off-by: Steven Shi <steven.shi@intel.com> Reviewed-by: Bob Feng <bob.c.feng@intel.com>