occa - add warning, OCCA backend is experimental

CEED · Oct 1, 2021 · dcc1e3e · dcc1e3e
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diff --git a/backends/occa/ceed-occa.cpp b/backends/occa/ceed-occa.cpp
@@ -14,6 +14,8 @@
 // software, applications, hardware, advanced system engineering and early
 // testbed platforms, in support of the nation's exascale computing imperative.
 
+ #warning "libCEED OCCA backend is experimental; for best performance, use device native backends"
+
 #include <map>
 #include <vector>
 #include <occa.hpp>

diff --git a/doc/sphinx/source/releasenotes.md b/doc/sphinx/source/releasenotes.md
@@ -14,6 +14,7 @@ for each release of libCEED.
 - Clarify and document conditions where `CeedQFunction` and `CeedOperator` become immutable and no further fields or suboperators can be added.
 - Add {c:func} `CeedOperatorLinearAssembleQFunctionBuildOrUpdate` to reduce object creation overhead in assembly of CeedOperator preconditioning ingredients.
 - Promote {c:func} `CeedOperatorCheckReady`to the public API to facilitate interactive interfaces.
+- Warning added when compiling OCCA backend to alert users that this backend is experimental.
 
 ### New features