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Ofast deprecation clarifications #101005

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Aug 2, 2024
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Ofast deprecation clarifications #101005

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Ofast documentation deprecation clarifications
sjoerdmeijer Jul 29, 2024
6507e9e
Update clang/docs/CommandGuide/clang.rst
sjoerdmeijer Jul 29, 2024
4800695
Update clang/docs/CommandGuide/clang.rst
sjoerdmeijer Jul 29, 2024
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8 changes: 6 additions & 2 deletions clang/docs/CommandGuide/clang.rst
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Expand Up @@ -429,8 +429,12 @@ Code Generation Options

:option:`-Ofast` Enables all the optimizations from :option:`-O3` along
with other aggressive optimizations that may violate strict compliance with
language standards. This is deprecated in favor of :option:`-O3`
in combination with :option:`-ffast-math`.
language standards. This is deprecated in Clang-19 and a warning is emitted
that :option:`-O3` in combination with :option:`-ffast-math` should be used
instead if the request for non-standard math behavior is intended. There
is no timeline yet for removal; the aim is to discourage use of
:option:`-Ofast` due to the surprising behavior of an optimization flag
changing the observable behavior of correct code.

:option:`-Os` Like :option:`-O2` with extra optimizations to reduce code
size.
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