mehdi_amini added inline comments. ================ Comment at: include/clang/Driver/Options.td:818 @@ -815,1 +817,3 @@ + HelpText<"Controls the backend parallelism of -flto=thin (default " + "of 0 means use std::thread::hardware_concurrency)">; def fthinlto_index_EQ : Joined<["-"], "fthinlto-index=">, ---------------- `std::thread::hardware_concurrency` is a bit implementation specific, can we find a better formulation? Something like `(default of 0 means the number of thread will be derived from the number of CPUs detected)`?
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