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-rw-r--r--clang/docs/UsersManual.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/clang/docs/UsersManual.rst b/clang/docs/UsersManual.rst
index 419714d38cd..de28d776715 100644
--- a/clang/docs/UsersManual.rst
+++ b/clang/docs/UsersManual.rst
@@ -701,6 +701,13 @@ Other Options
-------------
Clang options that don't fit neatly into other categories.
+.. option:: -fgnuc-version=
+
+ This flag controls the value of ``__GNUC__`` and related macros. This flag
+ does not enable or disable any GCC extensions implemented in Clang. Setting
+ the version to zero causes Clang to leave ``__GNUC__`` and other
+ GNU-namespaced macros, such as ``__GXX_WEAK__``, undefined.
+
.. option:: -MV
When emitting a dependency file, use formatting conventions appropriate
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