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+## Knob to control LTO thread
+
+Both the gnu linker and lld support using threads for speading up LTO, meson
+now provides a knob for this: `-Db_lto_threads`. Currently this is only
+supported for clang and gcc. Any positive integer is supported, `0` means
+`auto`. If the compiler or linker implemnets it's on `auto` we use that,
+otherwise the number of threads on the machine is used.