[PATCH] D27473: Bring back note about not supporting global register variables

[Michael Kuperstein via Phabricator via cfe-commits]

mkuper created this revision.
mkuper added a reviewer: rengolin.
mkuper added a subscriber: cfe-commits.

This partially reverts r260506 which removed this note.

Renato, the part about "not being implemented soon because it requires backend support" was taken verbatim from the original text, pre-r260506, I only added the fact non-allocatable registers are now supported.
If you prefer to have strong wording, feel free to make suggestions.


https://reviews.llvm.org/D27473

Files:
  docs/UsersManual.rst


Index: docs/UsersManual.rst
===================================================================
--- docs/UsersManual.rst
+++ docs/UsersManual.rst
@@ -1830,6 +1830,10 @@
      ...
      local_function(1);
 
+-  clang only supports global register variables when the register specified
+   is non-allocatable (e.g. the stack pointer). Support for general global
+   register variables is unlikely to be implemented soon because it requires
+   additional LLVM backend support.
 -  clang does not support static initialization of flexible array
    members. This appears to be a rarely used extension, but could be
    implemented pending user demand.


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