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invoke.texi: Clarify that most optimizations are not enabled without -O.

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2009-10-15  Alexander Monakov  <amonakov@ispras.ru>

	* doc/invoke.texi: Clarify that most optimizations are not enabled
	without -O.

From-SVN: r152852
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Alexander Monakov 2009-10-15 20:10:49 +04:00 • committed by Alexander Monakov
parent 77785f4f7a
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-10-15 Alexander Monakov <amonakov@ispras.ru>
* doc/invoke.texi: Clarify that most optimizations are not enabled
without -O.
2009-10-15 Richard Guenther <rguenther@suse.de>
PR lto/41668

3
gcc/doc/invoke.texi
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@ -5628,6 +5628,9 @@ each of them.
Not all optimizations are controlled directly by a flag. Only
optimizations that have a flag are listed in this section.
Most of the optimizations are not enabled if a @option{-O} level is not set on
the command line, even if individual optimization flags are specified.
Depending on the target and how GCC was configured, a slightly different
set of optimizations may be enabled at each @option{-O} level than
those listed here. You can invoke GCC with @samp{-Q --help=optimizers}