Documentation: add a note that -cc1 options are not guaranteed to be stable

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173280 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/FAQ.rst b/docs/FAQ.rst
index dc97507f054bc147a4c96023f171d282b01d7525..d0b47d685cf94823666c5d6d39e7ae06deb6e689 100644 (file)
--- a/docs/FAQ.rst
+++ b/docs/FAQ.rst
@@ -42,7 +42,8 @@ for your system.  To see these options, run:
 
 Some clang command line options are driver-only options, some are frontend-only
 options.  Frontend-only options are intended to be used only by developers.
-Users should not run ``clang -cc1`` directly.
+Users should not run ``clang -cc1`` directly, because ``-cc1`` options are not
+guaranteed to be stable.
 
 If you want to use a frontend-only option ("a ``-cc1`` option"), for example
 ``-ast-dump``, then you need to take the ``clang -cc1`` line generated by the