Update the supported C language standards in the user manual.

Remove mention of -std=c94 (it is spelled iso9899:1994, not c94) and add mention of -std=c17 and -std=gnu17.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@327264 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/UsersManual.rst b/docs/UsersManual.rst
index f19aacc4e99290a965b62bee0d072ea5cea63a28..1e46ebe03f8fa9b7e75e7bbb94b82d6de7dae50a 100644 (file)
--- a/docs/UsersManual.rst
+++ b/docs/UsersManual.rst
@@ -1931,8 +1931,8 @@ Differences between various standard modes
 ------------------------------------------
 
 clang supports the -std option, which changes what language mode clang
-uses. The supported modes for C are c89, gnu89, c94, c99, gnu99, c11,
-gnu11, and various aliases for those modes. If no -std option is
+uses. The supported modes for C are c89, gnu89, c99, gnu99, c11, gnu11,
+c17, gnu17, and various aliases for those modes. If no -std option is
 specified, clang defaults to gnu11 mode. Many C99 and C11 features are
 supported in earlier modes as a conforming extension, with a warning. Use
 ``-pedantic-errors`` to request an error if a feature from a later standard
@@ -1979,8 +1979,9 @@ Differences between ``*99`` and ``*11`` modes:
 -  Warnings for use of C11 features are disabled.
 -  ``__STDC_VERSION__`` is defined to ``201112L`` rather than ``199901L``.
 
-c94 mode is identical to c89 mode except that digraphs are enabled in
-c94 mode (FIXME: And ``__STDC_VERSION__`` should be defined!).
+Differences between ``*11`` and ``*17`` modes:
+
+-  ``__STDC_VERSION__`` is defined to ``201710L`` rather than ``201112L``.
 
 GCC extensions not implemented yet
 ----------------------------------