[libc++] Disallow running the libc++ benchmarks in standalone builds

We are trying to remove duplication of third-party code in
https://reviews.llvm.org/D112012, which will move the Google
Benchmark code outside of the `libcxx/` directory. That breaks
running the benchmarks in the Standalone build. Since we have
deprecated the Standalone build anyway, this patch just removes
support for the benchmark in Standalone mode until we remove that
mode entirely.

Differential Revision: https://reviews.llvm.org/D113503

libcxx/benchmarks/CMakeLists.txt

@@ -3,6 +3,12 @@ if (CMAKE_VERSION VERSION_LESS 3.17)
   return()
 endif()
 
+if (LIBCXX_STANDALONE_BUILD)
+  message(WARNING "The libc++ benchmarks are not available in a standalone build. Please migrate to an official build "
+                  "as documented in https://libcxx.llvm.org/BuildingLibcxx.html.")
+  return()
+endif()
+
 include(ExternalProject)
 include(CheckCXXCompilerFlag)
 

libcxx/utils/ci/run-buildbot

@@ -520,6 +520,7 @@ legacy-standalone)
           -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
           -DLLVM_PATH="${MONOREPO_ROOT}/llvm" \
           -DLIBCXX_CXX_ABI=libcxxabi \
+          -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
           -DLIBCXX_CXX_ABI_INCLUDE_PATHS="${MONOREPO_ROOT}/libcxxabi/include" \
           -DLIBCXX_CXX_ABI_LIBRARY_PATH="${BUILD_DIR}/libcxxabi/lib"