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QT4_CREATE_MOC_COMMAND is given a moc_flags argument that contains the COMPILE_DEFINITIONS and a potentially large list of include directories. Since it is a macro, the ${moc_flags} reference is replaced with this content and sent through cmMakefile::ExpandVariablesInString (EVIS). Since commit v3.0.0-rc1~138^2 (Qt4: Use generator expression in COMPILE_DEFINITIONS, 2014-01-13) the COMPILE_DEFINITIONS value contains a '$' so the EVIS fast-path is no longer used. Instead the full cmCommandArgumentParserHelper is now used on the large input, which is very slow (since it was originally created for hand-written code). Change QT4_CREATE_MOC_COMMAND to a function instead of a macro to avoid passing large content through EVIS. This makes it significantly faster.
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