use omp_set_max_active_levels instead of omp_set_nested (Qiskit#1752

) omp_set_nested was deprecated since OpenMP 3.0 and this commit replaces it with omp_set_max_active_levels. * use omp_set_max_active_levels instead of omp_set_nested * use omp_set_nested in WIN * Update releasenotes/notes/use_omp_set_max_active_levels-7e6c1d301c4434a6.yaml * use _OPENMP to select omp_set_max_active_levels or omp_set_nested --------- Co-authored-by: Jake Lishman <jake@binhbar.com>
hhorii · Apr 7, 2023 · 4a13ca9 · 4a13ca9
1 parent d4f4be2
commit 4a13ca9
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diff --git a/releasenotes/notes/use_omp_set_max_active_levels-7e6c1d301c4434a6.yaml b/releasenotes/notes/use_omp_set_max_active_levels-7e6c1d301c4434a6.yaml
@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Aer will now use ``omp_set_max_active_levels()`` instead of the deprecated ``omp_set_nested()`` when compiled against recent versions of OpenMP.
diff --git a/src/controllers/aer_controller.hpp b/src/controllers/aer_controller.hpp
@@ -963,7 +963,11 @@ Result Controller::execute(std::vector<Circuit> &circuits,
       parallel_nested_ = true;
 
       // nested should be set to zero if num_threads clause will be used
+#if _OPENMP >= 200805
+      omp_set_max_active_levels(0);
+#else
       omp_set_nested(0);
+#endif
 
       result.metadata.add(parallel_nested_, "omp_nested");
     } else {