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-flto-compression-level: improve documentation

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gcc/ChangeLog:

	* doc/invoke.texi: Document minimum and maximum value of the
	argument for both supported compression algorithms.
This commit is contained in:
Martin Liska 2021-04-06 14:31:13 +02:00
parent 7d7481ecbc
commit 6fd1271e71
1 changed files with 6 additions and 4 deletions
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gcc/doc/invoke.texi
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@ -12371,10 +12371,12 @@ the link-time optimization step directly from the WPA phase.
@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