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 +1,147 @@
+#!/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="${2}"
+ shift; shift
+ ;;
+ --build-type)
+ BUILD_TYPE="${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)/${1#./}"; fi
+}
+for arg in llvm_root cmake_path build_dir install_dir cache; do
+ path="$(realpath "${!arg}")"
+ eval "${arg}=\"${path}\""
+done
+
+function step() {
+ separator="$(printf "%0.s-" $(seq 1 ${#1}))"
+ echo
+ echo "${separator}"
+ echo "${1}"
+ echo "${separator}"
+}
+
+[[ -z "${BUILD_TYPE}" ]] && BUILD_TYPE="Release"
+
+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" \
+ -DLIBCXX_LINK_TESTS_WITH_SHARED_LIBCXXABI=ON \
+ -DLIBCXX_INCLUDE_TESTS=ON
+ )
+ 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
+
+cd ${install_dir}/lib
+cp ${build_dir}/32/lib/libc++.a .
+cp ${build_dir}/32/lib/libc++abi.a .
+cp ${build_dir}/32/lib/libunwind.a .
+
+ar -X64 -x ${build_dir}/64/lib/libc++.a
+ar -X64 -x ${build_dir}/64/lib/libc++abi.a
+ar -X64 -x ${build_dir}/64/lib/libunwind.a
+
+ar -X64 r libunwind.a libunwind.so.1
+rm libunwind.so.1
+ar -X64 r libc++abi.a libc++abi.so.1
+rm libc++abi.so.1
+ar -X64 r libc++.a libc++.so.1
+rm libc++.so.1
+
+# Install the headers by copying the headers from one of the builds into the
+# install directory. Headers from both bitmodes should be the same.
+headers_prefix="${install_dir}"
+
+step "Installing the libc++, libc++abi and libunwind headers to ${headers_prefix}/include"
+mkdir -p "${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}/libcxx/LICENSE.TXT" "${headers_prefix}/notices/libcxx.txt"
+cp "${llvm_root}/libunwind/LICENSE.TXT" "${headers_prefix}/notices/libunwind.txt"