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After upgrading libc++, math.h happens to be included at the point where this file tries to define NAN. Redefining a macro to a different value is an error, but #undef'ing a macro is OK even if the macro isn't actually defined. Bug: b/175635923 Test: treehugger Change-Id: Ie8e3e87189bcd7ed8fccccfc0a79e04a5bfda16b Merged-In: Ie8e3e87189bcd7ed8fccccfc0a79e04a5bfda16b