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-rw-r--r--clang/docs/CommandGuide/clang.rst7
1 files changed, 6 insertions, 1 deletions
diff --git a/clang/docs/CommandGuide/clang.rst b/clang/docs/CommandGuide/clang.rst
index 0546304e710..1c47db78da1 100644
--- a/clang/docs/CommandGuide/clang.rst
+++ b/clang/docs/CommandGuide/clang.rst
@@ -105,7 +105,12 @@ Language Selection and Mode Options
.. option:: -stdlib=<library>
Specify the C++ standard library to use; supported options are libstdc++ and
- libc++.
+ libc++. If not specified, platform default will be used.
+
+.. option:: -rtlib=<library>
+
+ Specify the compiler runtime library to use; supported options are libgcc and
+ compiler-rt. If not specified, platform default will be used.
.. option:: -ansi
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