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[libc++][doc] Add warning about limitation of --fresh in boostrapping build #65265

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4 changes: 4 additions & 0 deletions libcxx/docs/BuildingLibcxx.rst
Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,10 @@ CMake invocation at ``<monorepo>/llvm``:
This type of build is also commonly called a "Runtimes build", but we would like to move
away from that terminology, which is too confusing.

.. warning::
Adding the `--fresh` flag to the top-level cmake invocation in a bootstrapping build *will not*
freshen the cmake cache of any of the enabled runtimes.

Support for Windows
===================

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