[libcxx-commits] [libcxx] [libc++] Add a thread-safe version of std::lgamma in the dylib (PR #153631)

[Nikolas Klauser via libcxx-commits]

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@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifdef __APPLE__
+#  define _REENTRANT
+#endif
+
+#include <cmath>
+#include <math.h> // for lgamma_r
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+namespace __math {
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philnik777 wrote:

Do we really want to enshrine the `__math` namespace forever in our ABI?

https://github.com/llvm/llvm-project/pull/153631