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meson/docs/markdown/snippets/lto_threads.md

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Knob to control LTO thread

Both the gnu linker and lld support using threads for speeding 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 implements it's on auto we use that, otherwise the number of threads on the machine is used.