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Enhancement: Let users choose between full and thin LTO if applicable

    • Open Issue created by Robin Christ @robinchrist

    It would be nice if there was a flag to let users choose between slow, full LTO (which sometimes may be desired, because there are cases where full LTO still offers a massive performance benefit over thin LTO) and the currently standard thin LTO

    I believe on clang this would map to -flto and -flto=thin - I can't say on gcc, perhaps -flto and -fwhopr?

    The flag could be named CMAKE_INTERPROCEDURAL_OPTIMIZATION_PREFERRED_TYPE or CMAKE_IPO_PREFERRED_TYPE and (for now) take the values FULL and THIN

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