diff --git a/libcxx/cmake/caches/AIX.cmake b/libcxx/cmake/caches/AIX.cmake
new file mode 100644
--- /dev/null
+++ b/libcxx/cmake/caches/AIX.cmake
@@ -0,0 +1,21 @@
+set(CMAKE_BUILD_TYPE Release CACHE STRING "")
+set(CMAKE_BUILD_WITH_INSTALL_RPATH ON CACHE BOOL "")
+set(CMAKE_C_FLAGS "-D_ALL_SOURCE -mignore-xcoff-visibility" CACHE STRING "")
+set(CMAKE_CXX_FLAGS "-D_ALL_SOURCE -mignore-xcoff-visibility" CACHE STRING "")
+set(CMAKE_SHARED_LINKER_FLAGS "-Wl,-G -Wl,-bcdtors:all:-2147483548:s" CACHE STRING "")
+
+set(LIBCXX_ABI_VERSION "1" CACHE STRING "")
+set(LIBCXX_ENABLE_ASSERTIONS OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_ABI_LINKER_SCRIPT OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_EXPERIMENTAL_LIBRARY OFF CACHE BOOL "")
+set(LIBCXX_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXX_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
+set(LIBCXX_USE_COMPILER_RT ON CACHE BOOL "")
+
+set(LIBCXXABI_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBCXXABI_ENABLE_STATIC OFF CACHE BOOL "")
+set(LIBCXXABI_USE_LLVM_UNWINDER ON CACHE BOOL "")
+
+set(LIBUNWIND_ENABLE_SHARED ON CACHE BOOL "")
+set(LIBUNWIND_ENABLE_STATIC OFF CACHE BOOL "")
diff --git a/libcxx/utils/ci/aix-install-libcxx.sh b/libcxx/utils/ci/aix-install-libcxx.sh
new file mode 100755
--- /dev/null
+++ b/libcxx/utils/ci/aix-install-libcxx.sh
@@ -0,0 +1,128 @@
+#!/usr/bin/env bash
+#===----------------------------------------------------------------------===##
+#
+# 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
+#
+#===----------------------------------------------------------------------===##
+
+set -e
+
+PROGNAME="$(basename "${0}")"
+
+function error() { printf "error: %s\n" "$*"; exit 1; }
+
+function usage() {
+cat <<EOF
+Usage:
+${PROGNAME} [options]
+
+[-h|--help]                  Display this help and exit.
+
+--llvm-root <DIR>            Path to the root of the LLVM monorepo. Only the libcxx,
+                             libcxxabi and libunwind directories are required.
+
+--build-dir <DIR>            Path to the directory to use for building. This will
+                             contain intermediate build products.
+
+--install-dir <DIR>          Path to the directory to install the library to.
+
+--cache <PATH>               The CMake cache to use to control how the library gets built.
+EOF
+}
+
+while [[ $# -gt 0 ]]; do
+    case ${1} in
+        -h|--help)
+            usage
+            exit 0
+            ;;
+        --llvm-root)
+            llvm_root="${2}"
+            shift; shift
+            ;;
+        --build-dir)
+            build_dir="${2}"
+            shift; shift
+            ;;
+        --install-dir)
+            install_dir="${2}"
+            shift; shift
+            ;;
+        --cache)
+            cache="${2}"
+            shift; shift
+            ;;
+        *)
+            error "Unknown argument '${1}'"
+            ;;
+    esac
+done
+
+for arg in llvm_root build_dir install_dir cache; do
+    if [ -z ${!arg+x} ]; then
+        error "Missing required argument '--${arg//_/-}'"
+    elif [ "${!arg}" == "" ]; then
+        error "Argument to --${arg//_/-} must not be empty"
+    fi
+done
+
+# Allow using relative paths
+function realpath() {
+    if [[ $1 = /* ]]; then echo "$1"; else echo "$(pwd)/${1#./}"; fi
+}
+for arg in llvm_root build_dir install_dir cache; do
+    path="$(realpath "${!arg}")"
+    eval "${arg}=\"${path}\""
+done
+
+function step() {
+    separator="$(printf "%0.s-" $(seq 1 ${#1}))"
+    echo
+    echo "${separator}"
+    echo "${1}"
+    echo "${separator}"
+}
+
+for bitmode in 32 64; do
+  step "Building libc++.a, libc++abi.a and libunwind.a for ${bitmode}-bit"
+  mkdir -p "${build_dir}/${bitmode}"
+  (cd "${build_dir}/${bitmode}" &&
+    env OBJECT_MODE="${bitmode}" cmake "${llvm_root}/llvm" \
+        -C "${cache}" \
+        -GNinja \
+        -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi;libunwind" \
+        -DCMAKE_INSTALL_PREFIX="${build_dir}/${bitmode}-install"
+  )
+  env OBJECT_MODE="${bitmode}" cmake --build "${build_dir}/${bitmode}" --target install-cxx install-cxxabi install-unwind
+done
+
+
+step "Merging the resulting 32-bit and 64-bit libc++.a, libc++abi.a and libunwind.a into single libraries"
+if [[ ! -d "${install_dir}/lib" ]]; then
+    mkdir -p "${install_dir}/lib"
+fi
+
+LIBS="libc++ libc++abi libunwind"
+cd "${install_dir}/lib"
+for lib in ${LIBS}; do
+  cp "${build_dir}/32/lib/${lib}.a" .
+  ar -X64 -x "${build_dir}/64/lib/${lib}.a"
+  ar -X64 r "${lib}.a" "${lib}.so.1"
+  rm "${lib}.so.1"
+done
+
+# Install the headers by copying the headers from one of the builds into the
+# install directory. Headers from both bitmodes should be the same.
+headers_prefix="${install_dir}"
+
+step "Installing the libc++, libc++abi and libunwind headers to ${headers_prefix}/include"
+cp -r "${build_dir}/32-install/include" "${headers_prefix}/include"
+cp -r "${llvm_root}/libcxxabi/include/*" "${headers_prefix}/include" # TODO: libcxxabi should install its headers in CMake
+
+step "Installing the libc++, libc++abi and libunwind licenses"
+mkdir -p "${headers_prefix}/notices"
+cp "${llvm_root}/libcxx/LICENSE.TXT" "${headers_prefix}/notices/libcxx.txt"
+cp "${llvm_root}/libcxxabi/LICENSE.TXT" "${headers_prefix}/notices/libcxxabi.txt"
+cp "${llvm_root}/libunwind/LICENSE.TXT" "${headers_prefix}/notices/libunwind.txt"