Add #[cfg(target_has_atomic)] to get atomic support for the current target

1 files changed, 5 insertions, 0 deletions

diff --git a/src/doc/reference.md b/src/doc/reference.md
index 397abfe563c..ebb111a2e2e 100644
--- a/src/doc/reference.md
+++ b/src/doc/reference.md
@@ -2091,6 +2091,8 @@ The following configurations must be defined by the implementation:
 * `target_pointer_width = "..."` - Target pointer width in bits. This is set
   to `"32"` for targets with 32-bit pointers, and likewise set to `"64"` for
   64-bit pointers.
+* `target_has_atomic = "..."` - Set of integer sizes on which the target can perform
+  atomic operations. Values are `"8"`, `"16"`, `"32"`, `"64"` and `"ptr"`.
 * `target_vendor = "..."` - Vendor of the target, for example `apple`, `pc`, or
   simply `"unknown"`.
 * `test` - Enabled when compiling the test harness (using the `--test` flag).
@@ -2295,6 +2297,9 @@ The currently implemented features of the reference compiler are:
 * `cfg_target_vendor` - Allows conditional compilation using the `target_vendor`
                         matcher which is subject to change.
 
+* `cfg_target_has_atomic` - Allows conditional compilation using the `target_has_atomic`
+                            matcher which is subject to change.
+
 * `concat_idents` - Allows use of the `concat_idents` macro, which is in many
                     ways insufficient for concatenating identifiers, and may be
                     removed entirely for something more wholesome.