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-rw-r--r--libcxx/src/thread.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcxx/src/thread.cpp b/libcxx/src/thread.cpp
index c471b5c022e..afa8e163bec 100644
--- a/libcxx/src/thread.cpp
+++ b/libcxx/src/thread.cpp
@@ -99,7 +99,7 @@ thread::hardware_concurrency() _NOEXCEPT
#else // defined(CTL_HW) && defined(HW_NCPU)
// TODO: grovel through /proc or check cpuid on x86 and similar
// instructions on other architectures.
-# if defined(_MSC_VER) && ! defined(__clang__)
+# if defined(_LIBCPP_MSVC)
_LIBCPP_WARNING("hardware_concurrency not yet implemented")
# else
# warning hardware_concurrency not yet implemented
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