[libc++][Apple] Make sure to set the LIBCXX_LIBRARY_VERSION when building for Apple

Differential Revision: https://reviews.llvm.org/D146361

diff --git a/libcxx/utils/ci/apple-install-libcxx.sh b/libcxx/utils/ci/apple-install-libcxx.sh
index e12e295..c1d8102 100755 (executable)
--- a/libcxx/utils/ci/apple-install-libcxx.sh
+++ b/libcxx/utils/ci/apple-install-libcxx.sh
@@ -119,7 +119,8 @@ for arch in ${architectures}; do
                 -DCMAKE_INSTALL_PREFIX="${build_dir}/${arch}-install" \
                 -DCMAKE_INSTALL_NAME_DIR="/usr/lib" \
                 -DCMAKE_OSX_ARCHITECTURES="${arch}" \
-                -DLIBCXXABI_LIBRARY_VERSION="${version}"
+                -DLIBCXXABI_LIBRARY_VERSION="${version}" \
+                -DLIBCXX_LIBRARY_VERSION="${version}"
 
     if [ "$headers_only" = true ]; then
         xcrun cmake --build "${build_dir}/${arch}" --target install-cxx-headers install-cxxabi-headers -- -v