From 543f8a6487087dc3b9012118cb469efdcafe2a7d Mon Sep 17 00:00:00 2001
From: fis <jm.yuan@outlook.com>
Date: Wed, 7 Oct 2020 15:30:36 +0800
Subject: [PATCH] Conditional compilation.

---
 tests/cpp/common/test_threading_utils.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tests/cpp/common/test_threading_utils.cc b/tests/cpp/common/test_threading_utils.cc
index 76a6a3876edd..8588d467d07a 100644
--- a/tests/cpp/common/test_threading_utils.cc
+++ b/tests/cpp/common/test_threading_utils.cc
@@ -88,7 +88,7 @@ TEST(ParallelFor2dNonUniform, Test) {
 
   omp_set_num_threads(old);
 }
-
+#if defined(_OPENMP)
 TEST(OmpSetNumThreads, Basic) {
   auto nthreads = 2;
   auto orgi = OmpSetNumThreads(&nthreads);
@@ -104,5 +104,6 @@ TEST(OmpSetNumThreads, Basic) {
 
   omp_set_num_threads(orgi);
 }
+#endif  // defined(_OPENMP)
 }  // namespace common
 }  // namespace xgboost