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-rw-r--r--src/thread.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread.cpp b/src/thread.cpp
index 3f283c385b76b..412a8fa0a6208 100644
--- a/src/thread.cpp
+++ b/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(_LIBCPP_MSVC)
+# if defined(_LIBCPP_WARNING)
_LIBCPP_WARNING("hardware_concurrency not yet implemented")
# else
# warning hardware_concurrency not yet implemented