Merge pull request #465 from ocaml-multicore/add-flexdll-issue

Add the Dynlink/flexdll issue and the Sys.rename regression issue

README.md

@@ -396,6 +396,21 @@ property can be done in two different ways:
 Issues
 ======
 
+Parallel `Dynlink` tests under Windows could deadlock or crash (known, fixed, flexdll)
+--------------------------------------------------------------------------------------
+
+Tests of `Dynlink` on Windows revealed that [the underlying FlexDLL was
+unsafe for parallel usage](https://github.com/ocaml/ocaml/issues/13046)
+
+
+`Sys.rename` regression under MinGW/MSVC (new, fixed, runtime)
+--------------------------------------------------------------
+
+Earlier fixes to bring Windows behaviour closer to other platforms introduced
+[an unfortunate cornercase regression](https://github.com/ocaml/ocaml/pull/13166)
+if attempting to `Sys.rename` a parent directory to an empty child directory
+
+
 Regression causing a Cygwin configure to fail (new, fixed, configure)
 ---------------------------------------------------------------------