Ofast deprecation clarifications (llvm#101005)

Following up on the RFC discussion, this is clarifying that the main purpose and effect of the -Ofast deprecation is to discourage its usage and that everything else is more or less open for discussion, e.g. there is no timeline yet for removal. --------- Co-authored-by: Aaron Ballman <[email protected]>
llvmbot · Aug 2, 2024 · 48d4d4b · 48d4d4b
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commit 48d4d4b
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/clang/docs/CommandGuide/clang.rst b/clang/docs/CommandGuide/clang.rst
@@ -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.