@opindex flto-compression-level
This option specifies the level of compression used for intermediate
language written to LTO object files, and is only meaningful in
-conjunction with LTO mode (@option{-flto}). Valid
-values are 0 (no compression) to 9 (maximum compression). Values
-outside this range are clamped to either 0 or 9. If the option is not
-given, a default balanced compression setting is used.
+conjunction with LTO mode (@option{-flto}). GCC currently supports two
+LTO compression algorithms. For zstd, valid values are 0 (no compression)
+to 19 (maximum compression), while zlib supports values from 0 to 9.
+Values outside this range are clamped to either minimum or maximum
+of the supported values. If the option is not given,
+a default balanced compression setting is used.
@item -fuse-linker-plugin
@opindex fuse-linker-plugin