[clang] dc2fc9e - [flang][docs] Update the `-Ofast` description in `FlangDriver.md` (#180138)

[via cfe-commits]

Author: Shunsuke Watanabe
Date: 2026-02-12T08:50:03+09:00
New Revision: dc2fc9e10bd6d8d93d91f18a60e6cd7d24ffadb9

URL: https://github.com/llvm/llvm-project/commit/dc2fc9e10bd6d8d93d91f18a60e6cd7d24ffadb9
DIFF: https://github.com/llvm/llvm-project/commit/dc2fc9e10bd6d8d93d91f18a60e6cd7d24ffadb9.diff

LOG: [flang][docs] Update the `-Ofast` description in `FlangDriver.md` (#180138)

After #170505, `-fno-protect-parens` is now required for flang to behave
the same as `-Ofast`. This patch adds that information to the
description of `-Ofast` in `FlangDriver.md`.

Added: 
    

Modified: 
    clang/include/clang/Options/Options.td
    flang/docs/FlangDriver.md

Removed: 
    


################################################################################
diff  --git a/clang/include/clang/Options/Options.td b/clang/include/clang/Options/Options.td
index 653c103983853..5b876db25c544 100644
--- a/clang/include/clang/Options/Options.td
+++ b/clang/include/clang/Options/Options.td
@@ -849,7 +849,7 @@ def O_flag : Flag<["-"], "O">, Visibility<[ClangOption, CC1Option, FC1Option]>,
 def Ofast : Joined<["-"], "Ofast">, Group<O_Group>,
   Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
   HelpTextForVariants<[FlangOption, FC1Option],
-    "Deprecated; use '-O3 -ffast-math -fstack-arrays' for the same behavior,"
+    "Deprecated; use '-O3 -ffast-math -fstack-arrays -fno-protect-parens' for the same behavior,"
     " or '-O3 -fstack-arrays' to enable only conforming optimizations">,
   HelpText<"Deprecated; use '-O3 -ffast-math' for the same behavior,"
            " or '-O3' to enable only conforming optimizations">;

diff  --git a/flang/docs/FlangDriver.md b/flang/docs/FlangDriver.md
index 9953f2252218b..63f2ce3e67570 100644
--- a/flang/docs/FlangDriver.md
+++ b/flang/docs/FlangDriver.md
@@ -559,7 +559,7 @@ See the
 documentation for more details.
 
 ## Ofast and Fast Math
-`-Ofast` in Flang means `-O3 -ffast-math -fstack-arrays`.
+`-Ofast` in Flang means `-O3 -ffast-math -fstack-arrays -fno-protect-parens`.
 
 `-ffast-math` means the following:
  - `-fno-honor-infinities`