Add link to 3rd party GDB pretty-printers

llvm-svn: 258270
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 19352b1cbe2763857b13f45c632d01f3d089f0d6
diff --git a/docs/UsingLibcxx.rst b/docs/UsingLibcxx.rst
index 2a11791..344eda5 100644
--- a/docs/UsingLibcxx.rst
+++ b/docs/UsingLibcxx.rst
@@ -87,3 +87,16 @@
 
   $ g++ -nostdinc++ -I<libcxx-install-prefix>/include/c++/v1 \
          test.cpp -nodefaultlibs -lc++ -lc++abi -lm -lc -lgcc_s -lgcc
+
+
+GDB Pretty printers for libc++
+------------------------------
+
+GDB does not support pretty-printing of libc++ symbols by default. Unfortunately
+libc++ does not provide pretty-printers itself. However there are 3rd
+party implementations available and although they are not officially
+supported by libc++ they may be useful to users.
+
+Known 3rd Party Implementations Include:
+
+* `Koutheir's libc++ pretty-printers <https://github.com/koutheir/libcxx-pretty-printers>`_.