libc++: document in the release notes that a C++20 compiler is expected

Differential Revision: https://reviews.llvm.org/D111043
llvm · Oct 4, 2021 · c788bea · c788bea
1 parent 0061e68
commit c788bea
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diff --git a/libcxx/docs/ReleaseNotes.rst b/libcxx/docs/ReleaseNotes.rst
@@ -50,3 +50,10 @@ API Changes
 -----------
 
 - ...
+
+Build System Changes
+--------------------
+
+- Building the libc++ shared or static library requires a C++ 20 capable compiler.
+  Use ``-DLLVM_ENABLE_PROJECTS='clang;compiler-rt' -DLLVM_ENABLE_RUNTIMES='libcxx;libcxxabi'``
+  to build libc++ using a fresh build of Clang.