This change enable gcc LTO optimisations. It helps reduce RAM usege and rpms size. For example on F31 octave rpm with LTO 17MB vs 18MB without LTO. And octave-debuginfo rpm with LTO 117MB vs 128MB without LTO. Enabling it has no any issue in runtime but can take some more time to build (but not critical).
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71.8%
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28.2%