#!/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
set -o pipefail
unset LANG
unset LC_ALL
unset LC_COLLATE

PROGNAME="$(basename "${0}")"

function usage() {
cat <<EOF
Usage:
${PROGNAME} [options] <BUILDER>

[-h|--help]         Display this help and exit.

--llvm-root <DIR>   Path to the root of the LLVM monorepo. By default, we try
                    to figure it out based on the current working directory.

--build-dir <DIR>   The directory to use for building the library. By default,
                    this is '<llvm-root>/build/<builder>'.

Environment variables
CC                  The C compiler to use, this value is used by CMake. This
                    variable is optional.

CXX                 The C++ compiler to use, this value is used by CMake. This
                    variable is optional.

CMAKE               The CMake binary to use. This variable is optional.

CLANG_FORMAT        The clang-format binary to use when generating the format
                    ignore list.

EOF
}

if [[ $# == 0 ]]; then
   usage
   exit 0
fi

while [[ $# -gt 0 ]]; do
    case ${1} in
        -h|--help)
            usage
            exit 0
            ;;
        --llvm-root)
            MONOREPO_ROOT="${2}"
            shift; shift
            ;;
        --build-dir)
            BUILD_DIR="${2}"
            shift; shift
            ;;
        *)
            BUILDER="${1}"
            shift
            ;;
    esac
done

MONOREPO_ROOT="${MONOREPO_ROOT:="$(git rev-parse --show-toplevel)"}"
BUILD_DIR="${BUILD_DIR:=${MONOREPO_ROOT}/build/${BUILDER}}"
INSTALL_DIR="${BUILD_DIR}/install"

# If we can find Ninja/CMake provided by Xcode, use those since we know their
# version will generally work with the Clang shipped in Xcode (e.g. if Clang
# knows about -std=c++20, the CMake bundled in Xcode will probably know about
# that flag too).
if xcrun --find ninja &>/dev/null; then
    NINJA="$(xcrun --find ninja)"
elif which ninja &>/dev/null; then
    # The current implementation of modules needs the absolute path to the ninja
    # binary.
    # TODO MODULES Is this still needed when CMake has libc++ module support?
    NINJA="$(which ninja)"
else
    NINJA="ninja"
fi

if [ -z "${CMAKE}" ]; then
    if xcrun --find cmake &>/dev/null; then
        CMAKE="$(xcrun --find cmake)"
    else
        CMAKE="cmake"
    fi
fi

function step() {
  endstep
  set +x
  if [[ ! -z ${GITHUB_ACTIONS+x} ]]; then
    echo "::group::$1"
    export IN_GROUP=1
  else
    echo "--- $1"
  fi
  set -x
}

function endstep() {
  set +x
  if [[ ! -z ${GITHUB_ACTIONS+x} ]] && [[ ! -z ${IN_GROUP+x} ]]; then
    echo "::endgroup::"
    unset IN_GROUP
  fi
  set -x
}

function error() {
    echo "::error::$1"
}

function clean() {
    rm -rf "${BUILD_DIR}"
}

function generate-cmake-base() {
    step "Generating CMake"
    ${CMAKE} \
          -S "${MONOREPO_ROOT}/runtimes" \
          -B "${BUILD_DIR}" \
          -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
          -DCMAKE_BUILD_TYPE=RelWithDebInfo \
          -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
          -DLIBCXX_ENABLE_WERROR=YES \
          -DLIBCXXABI_ENABLE_WERROR=YES \
          -DLIBUNWIND_ENABLE_WERROR=YES \
          -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
          "${@}"
}

function generate-cmake() {
    generate-cmake-base \
          -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
          -DLIBCXX_CXX_ABI=libcxxabi \
          "${@}"
}

function generate-cmake-libcxx-win() {
    generate-cmake-base \
          -DLLVM_ENABLE_RUNTIMES="libcxx" \
          -DCMAKE_C_COMPILER=clang-cl \
          -DCMAKE_CXX_COMPILER=clang-cl \
          "${@}"
}

function generate-cmake-android() {
    generate-cmake-base \
          -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
          -DLIBCXX_CXX_ABI=libcxxabi \
          "${@}"
}

function check-runtimes() {
    step "Building libc++ test dependencies"
    ${NINJA} -vC "${BUILD_DIR}" cxx-test-depends

    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx

    step "Running the libc++abi tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxxabi

    step "Running the libunwind tests"
    ${NINJA} -vC "${BUILD_DIR}" check-unwind
}

# TODO: The goal is to test this against all configurations. We should also move
#       this to the Lit test suite instead of being a separate CMake target.
function check-abi-list() {
    step "Running the libc++ ABI list test"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx-abilist || (
        error "Generating the libc++ ABI list after failed check"
        ${NINJA} -vC "${BUILD_DIR}" generate-cxx-abilist
        false
    )
}

function check-cxx-benchmarks() {
    step "Running the benchmarks"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx-benchmarks
}

function test-armv7m-picolibc() {
    clean

    # To make it easier to get this builder up and running, build picolibc
    # from scratch. Anecdotally, the build-picolibc script takes about 16 seconds.
    # This could be optimised by building picolibc into the Docker container.
    step "Building picolibc from source"
    ${MONOREPO_ROOT}/libcxx/utils/ci/build-picolibc.sh \
        --build-dir "${BUILD_DIR}" \
        --install-dir "${INSTALL_DIR}" \
        --target armv7m-none-eabi

    step "Generating CMake for compiler-rt"
    flags="--sysroot=${INSTALL_DIR}"
    ${CMAKE} \
        -S "${MONOREPO_ROOT}/compiler-rt" \
        -B "${BUILD_DIR}/compiler-rt" \
        -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
        -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
        -DCMAKE_C_FLAGS="${flags}" \
        -DCMAKE_CXX_FLAGS="${flags}" \
        -DLLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON \
        "${@}"

    step "Generating CMake for libc++"
    generate-cmake \
        -DLIBCXX_TEST_CONFIG="armv7m-picolibc-libc++.cfg.in" \
        -DLIBCXXABI_TEST_CONFIG="armv7m-picolibc-libc++abi.cfg.in" \
        -DLIBUNWIND_TEST_CONFIG="armv7m-picolibc-libunwind.cfg.in" \
        -DCMAKE_C_FLAGS="${flags}" \
        -DCMAKE_CXX_FLAGS="${flags}" \
        "${@}"

    step "Installing compiler-rt"
    ${NINJA} -vC "${BUILD_DIR}/compiler-rt" install

    # Prior to clang 19, armv7m-none-eabi normalised to armv7m-none-unknown-eabi.
    # clang 19 changed this to armv7m-unknown-none-eabi. So for as long as 18.x
    # is supported, we have to ask clang what the triple will be.
    NORMALISED_TARGET_TRIPLE=$(${CC-cc} --target=armv7m-none-eabi -print-target-triple)
    # Without this step linking fails later in the build.
    mv "${BUILD_DIR}/install/lib/${NORMALISED_TARGET_TRIPLE}"/* "${BUILD_DIR}/install/lib"

    check-runtimes
}

# Print the version of a few tools to aid diagnostics in some cases
step "Diagnose tools in use"
${CMAKE} --version
${NINJA} --version
if [ ! -z "${CXX}" ]; then ${CXX} --version; fi

case "${BUILDER}" in
check-generated-output)
    # `! foo` doesn't work properly with `set -e`, use `! foo || false` instead.
    # https://stackoverflow.com/questions/57681955/set-e-does-not-respect-logical-not
    clean
    generate-cmake

    # Reject patches that forgot to re-run the generator scripts.
    step "Making sure the generator scripts were run"
    set +x # Printing all the commands below just creates extremely confusing output
    ${NINJA} -vC "${BUILD_DIR}" libcxx-generate-files
    git diff | tee ${BUILD_DIR}/generated_output.patch
    git ls-files -o --exclude-standard | tee ${BUILD_DIR}/generated_output.status
    ! grep -q '^--- a' ${BUILD_DIR}/generated_output.patch || false
    if [ -s ${BUILD_DIR}/generated_output.status ]; then
        echo "It looks like not all the generator scripts were run,"
        echo "did you forget to build the libcxx-generate-files target?"
        echo "Did you add all new files it generated?"
        false
    fi

    # This depends on LC_COLLATE set at the top of this script.
    step "Reject patches that introduce non-ASCII characters or hard tabs."
    ! grep -rn '[^ -~]' libcxx/include libcxx/src libcxx/test \
           --exclude '*.dat' \
           --exclude '*unicode*.cpp' \
           --exclude '*print*.sh.cpp' \
           --exclude 'escaped_output.*.pass.cpp' \
           --exclude 'format_tests.h' \
           --exclude 'format.functions.tests.h' \
           --exclude 'formatter.*.pass.cpp' \
           --exclude 'grep.pass.cpp' \
           --exclude 'locale-specific_form.pass.cpp' \
           --exclude 'ostream.pass.cpp' \
           --exclude 'transcoding.pass.cpp' \
           --exclude 'underflow.pass.cpp' \
           || false
;;
#
# Various Standard modes
#
generic-cxx03)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx03.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx11)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx11.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx14)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx14.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx17)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx17.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx20)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx20.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx23)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx23.cmake"
    check-runtimes
    check-abi-list
;;
generic-cxx26)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx26.cmake"
    check-runtimes
    check-abi-list
;;
#
# Other compiler support
#
generic-gcc)
    clean
    generate-cmake -DLIBCXX_ENABLE_WERROR=NO \
                   -DLIBCXXABI_ENABLE_WERROR=NO \
                   -DLIBUNWIND_ENABLE_WERROR=NO
    check-runtimes
;;
generic-gcc-cxx11)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx11.cmake" \
                   -DLIBCXX_ENABLE_WERROR=NO \
                   -DLIBCXXABI_ENABLE_WERROR=NO \
                   -DLIBUNWIND_ENABLE_WERROR=NO
    check-runtimes
;;
#
# Sanitizers
#
generic-asan)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-asan.cmake"
    check-runtimes
;;
generic-msan)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-msan.cmake"
    check-runtimes
;;
generic-tsan)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-tsan.cmake"
    check-runtimes
;;
generic-ubsan)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-ubsan.cmake"
    check-runtimes
;;
#
# Various build configurations
#
bootstrapping-build)
    clean

    step "Generating CMake"
    ${CMAKE} \
          -S "${MONOREPO_ROOT}/llvm" \
          -B "${BUILD_DIR}" \
          -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
          -DCMAKE_CXX_COMPILER_LAUNCHER="ccache" \
          -DCMAKE_BUILD_TYPE=Release \
          -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
          -DLLVM_ENABLE_PROJECTS="clang;lldb" \
          -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
          -DLLVM_RUNTIME_TARGETS="$(${CXX} --print-target-triple)" \
          -DLLVM_HOST_TRIPLE="$(${CXX} --print-target-triple)" \
          -DLLVM_TARGETS_TO_BUILD="host" \
          -DRUNTIMES_BUILD_ALLOW_DARWIN=ON \
          -DLLVM_ENABLE_ASSERTIONS=ON \
          -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests"

    step "Running the LLDB libc++ data formatter tests"
    ${NINJA} -vC "${BUILD_DIR}" lldb-api-test-deps
    ${BUILD_DIR}/bin/llvm-lit -sv --param dotest-args='--category libc++' "${MONOREPO_ROOT}/lldb/test/API"

    step "Running the libc++ and libc++abi tests"
    ${NINJA} -vC "${BUILD_DIR}" check-runtimes

    step "Installing libc++ and libc++abi to a fake location"
    ${NINJA} -vC "${BUILD_DIR}" install-runtimes

    ccache -s
;;
generic-static)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-static.cmake"
    check-runtimes
;;
generic-merged)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-merged.cmake" \
                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in" \
                   -DLIBCXXABI_TEST_CONFIG="llvm-libc++abi-merged.cfg.in" \
                   -DLIBUNWIND_TEST_CONFIG="llvm-libunwind-merged.cfg.in"
    check-runtimes
;;
generic-hardening-mode-fast)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-hardening-mode-fast.cmake"
    check-runtimes
    check-abi-list
;;
generic-hardening-mode-fast-with-abi-breaks)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-hardening-mode-fast-with-abi-breaks.cmake"
    check-runtimes
    # Not checking ABI list since we purposefully enable ABI breaking changes
;;
generic-hardening-mode-extensive)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-hardening-mode-extensive.cmake"
    check-runtimes
    check-abi-list
;;
generic-hardening-mode-debug)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-hardening-mode-debug.cmake"
    check-runtimes
    check-abi-list
;;
#
# Module builds
#
generic-modules)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-modules.cmake"
    check-runtimes
    check-abi-list
;;
generic-modules-lsv)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-modules-lsv.cmake"
    check-runtimes
    check-abi-list
;;
#
# Parts removed
#
generic-no-threads)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-threads.cmake"
    check-runtimes
;;
generic-no-filesystem)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-filesystem.cmake"
    check-runtimes
;;
generic-no-random_device)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-random_device.cmake"
    check-runtimes
;;
generic-no-localization)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-localization.cmake"
    check-runtimes
;;
generic-no-terminal)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-terminal.cmake"
    check-runtimes
;;
generic-no-unicode)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-unicode.cmake"
    check-runtimes
;;
generic-no-wide-characters)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-wide-characters.cmake"
    check-runtimes
;;
generic-no-tzdb)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-tzdb.cmake"
    check-runtimes
;;
generic-no-experimental)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-experimental.cmake"
    check-runtimes
    check-abi-list
;;
generic-no-exceptions)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-exceptions.cmake"
    check-runtimes
    check-abi-list
;;
generic-no-rtti)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-rtti.cmake"
    check-runtimes
;;
#
# Other miscellaneous jobs
#
generic-abi-unstable)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-abi-unstable.cmake"
    check-runtimes
;;
generic-optimized-speed)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-optimized-speed.cmake"
    check-runtimes
;;
apple-configuration)
    clean

    step "Installing libc++ with the Apple system configuration"
    arch="$(uname -m)"
    xcrun --sdk macosx                                              \
        ${MONOREPO_ROOT}/libcxx/utils/ci/apple-install-libcxx.sh    \
            --llvm-root ${MONOREPO_ROOT}                            \
            --build-dir ${BUILD_DIR}                                \
            --install-dir ${INSTALL_DIR}                            \
            --symbols-dir "${BUILD_DIR}/symbols"                    \
            --architectures "${arch}"                               \
            --version "999.99"

    step "Running tests against Apple-configured libc++"
    # TODO: It would be better to run the tests against the fake-installed version of libc++ instead
    xcrun --sdk macosx ninja -vC "${BUILD_DIR}/${arch}" check-cxx check-cxxabi check-cxx-abilist
;;
apple-system-hardened)
    clean

    arch="$(uname -m)"
    version="$(sw_vers --productVersion)"
    params="target_triple=${arch}-apple-macosx${version}"
    params+=";hardening_mode=fast"

    # In the Apple system configuration, we build libc++ and libunwind separately.
    step "Installing libc++ and libc++abi in Apple-system configuration"
    ${CMAKE} \
        -S "${MONOREPO_ROOT}/runtimes" \
        -B "${BUILD_DIR}/cxx" \
        -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
        -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}/cxx" \
        -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
        -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
        -DLIBCXX_CXX_ABI=libcxxabi \
        -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
        -DLIBCXX_TEST_CONFIG="apple-libc++-system.cfg.in" \
        -DLIBCXXABI_TEST_CONFIG="apple-libc++abi-system.cfg.in" \
        -DLIBCXX_TEST_PARAMS="${params}" \
        -DLIBCXXABI_TEST_PARAMS="${params}"

    step "Installing libunwind in Apple-system configuration"
    ${CMAKE} \
        -S "${MONOREPO_ROOT}/runtimes" \
        -B "${BUILD_DIR}/unwind" \
        -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
        -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}/unwind" \
        -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
        -DLLVM_ENABLE_RUNTIMES="libunwind" \
        -DLIBUNWIND_TEST_CONFIG="apple-libunwind-system.cfg.in" \
        -DLIBUNWIND_TEST_PARAMS="${params}" \
        -DCMAKE_INSTALL_NAME_DIR="/usr/lib/system"

    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}/cxx" check-cxx

    step "Running the libc++abi tests"
    ${NINJA} -vC "${BUILD_DIR}/cxx" check-cxxabi

    step "Running the libunwind tests"
    ${NINJA} -vC "${BUILD_DIR}/unwind" check-unwind
;;
apple-system)
    clean

    arch="$(uname -m)"
    version="$(sw_vers --productVersion)"
    params="target_triple=${arch}-apple-macosx${version}"

    # In the Apple system configuration, we build libc++ and libunwind separately.
    step "Installing libc++ and libc++abi in Apple-system configuration"
    ${CMAKE} \
        -S "${MONOREPO_ROOT}/runtimes" \
        -B "${BUILD_DIR}/cxx" \
        -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
        -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}/cxx" \
        -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
        -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
        -DLIBCXX_CXX_ABI=libcxxabi \
        -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
        -DLIBCXX_TEST_CONFIG="apple-libc++-system.cfg.in" \
        -DLIBCXXABI_TEST_CONFIG="apple-libc++abi-system.cfg.in" \
        -DLIBCXX_TEST_PARAMS="${params}" \
        -DLIBCXXABI_TEST_PARAMS="${params}"

    step "Installing libunwind in Apple-system configuration"
    ${CMAKE} \
        -S "${MONOREPO_ROOT}/runtimes" \
        -B "${BUILD_DIR}/unwind" \
        -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
        -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}/unwind" \
        -DLLVM_LIT_ARGS="-sv --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
        -DLLVM_ENABLE_RUNTIMES="libunwind" \
        -DLIBUNWIND_TEST_CONFIG="apple-libunwind-system.cfg.in" \
        -DLIBUNWIND_TEST_PARAMS="${params}" \
        -DCMAKE_INSTALL_NAME_DIR="/usr/lib/system"

    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}/cxx" check-cxx

    step "Running the libc++abi tests"
    ${NINJA} -vC "${BUILD_DIR}/cxx" check-cxxabi

    step "Running the libunwind tests"
    ${NINJA} -vC "${BUILD_DIR}/unwind" check-unwind
;;
benchmarks)
    clean
    generate-cmake
    check-cxx-benchmarks
;;
aarch64)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AArch64.cmake"
    check-runtimes
;;
aarch64-no-exceptions)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AArch64.cmake" \
                   -DLIBCXX_ENABLE_EXCEPTIONS=OFF \
                   -DLIBCXXABI_ENABLE_EXCEPTIONS=OFF
    check-runtimes
;;
# Aka Armv8 32 bit
armv8)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv8Arm.cmake"
    check-runtimes
;;
armv8-no-exceptions)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv8Thumb-no-exceptions.cmake"
    check-runtimes
;;
# Armv7 32 bit. One building Arm only one Thumb only code.
armv7)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7Arm.cmake"
    check-runtimes
;;
armv7-no-exceptions)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7Thumb-no-exceptions.cmake"
    check-runtimes
;;
armv7m-picolibc)
    test-armv7m-picolibc \
        -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7M-picolibc.cmake"
;;
armv7m-picolibc-no-exceptions)
    test-armv7m-picolibc \
        -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7M-picolibc.cmake" \
        -DLIBCXXABI_ENABLE_EXCEPTIONS=OFF \
        -DLIBCXXABI_ENABLE_STATIC_UNWINDER=OFF \
        -DLIBCXX_ENABLE_EXCEPTIONS=OFF \
        -DLIBCXX_ENABLE_RTTI=OFF
;;
clang-cl-dll)
    clean
    # TODO: Currently, building with the experimental library breaks running
    # tests (the test linking look for the c++experimental library with the
    # wrong name, and the statically linked c++experimental can't be linked
    # correctly when libc++ visibility attributes indicate dllimport linkage
    # anyway), thus just disable the experimental library. Remove this
    # setting when cmake and the test driver does the right thing automatically.
    generate-cmake-libcxx-win -DLIBCXX_TEST_PARAMS="enable_experimental=False"
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
;;
clang-cl-static)
    clean
    generate-cmake-libcxx-win -DLIBCXX_ENABLE_SHARED=OFF
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
;;
clang-cl-no-vcruntime)
    clean
    # Building libc++ in the same way as in clang-cl-dll above, but running
    # tests with -D_HAS_EXCEPTIONS=0, which users might set in certain
    # translation units while using libc++, even if libc++ is built with
    # exceptions enabled.
    generate-cmake-libcxx-win -DLIBCXX_TEST_PARAMS="enable_experimental=False" \
                              -DLIBCXX_TEST_CONFIG="llvm-libc++-shared-no-vcruntime-clangcl.cfg.in"
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
;;
clang-cl-debug)
    clean
    generate-cmake-libcxx-win -DLIBCXX_TEST_PARAMS="enable_experimental=False" \
                              -DCMAKE_BUILD_TYPE=Debug
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
;;
clang-cl-static-crt)
    clean
    # Test linking a static libc++ with the static CRT ("MultiThreaded" denotes
    # the static CRT, as opposed to "MultiThreadedDLL" which is the default).
    generate-cmake-libcxx-win -DLIBCXX_ENABLE_SHARED=OFF \
                              -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
;;
mingw-dll)
    clean
    generate-cmake \
          -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
    check-runtimes
;;
mingw-static)
    clean
    generate-cmake \
          -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake" \
          -DLIBCXX_ENABLE_SHARED=OFF \
          -DLIBUNWIND_ENABLE_SHARED=OFF
    check-runtimes
;;
mingw-dll-i686)
    clean
    generate-cmake \
          -DCMAKE_C_COMPILER=i686-w64-mingw32-clang \
          -DCMAKE_CXX_COMPILER=i686-w64-mingw32-clang++ \
          -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
    check-runtimes
;;
mingw-incomplete-sysroot)
    # When bringing up a new cross compiler from scratch, we build
    # libunwind/libcxx in a setup where the toolchain is incomplete and
    # unable to perform the normal linker checks; this requires a few
    # special cases in the CMake files.
    #
    # Building in an incomplete setup requires setting CMAKE_*_COMPILER_WORKS,
    # as CMake fails to probe the compiler. This case also requires
    # setting CMAKE_CXX_COMPILER_TARGET, as LLVM's heuristics for setting
    # the triple fails when CMake hasn't been able to probe the environment.
    # (This is what one has to do when building the initial libunwind/libcxx
    # for a new toolchain.)
    clean
    generate-cmake \
          -DCMAKE_C_COMPILER_WORKS=TRUE \
          -DCMAKE_CXX_COMPILER_WORKS=TRUE \
          -DCMAKE_C_COMPILER_TARGET=x86_64-w64-windows-gnu \
          -DCMAKE_CXX_COMPILER_TARGET=x86_64-w64-windows-gnu \
          -C "${MONOREPO_ROOT}/libcxx/cmake/caches/MinGW.cmake"
    # Only test that building succeeds; there's not much extra value in running
    # the tests here, as it would be equivalent to the mingw-dll config above.
    step "Building the runtimes"
    ${NINJA} -vC "${BUILD_DIR}"
;;
aix)
    clean
    generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AIX.cmake" \
                   -DLIBCXX_TEST_CONFIG="ibm-libc++-shared.cfg.in" \
                   -DLIBCXXABI_TEST_CONFIG="ibm-libc++abi-shared.cfg.in" \
                   -DLIBUNWIND_TEST_CONFIG="ibm-libunwind-shared.cfg.in"
    check-abi-list
    check-runtimes
;;
android-ndk-*)
    clean

    ANDROID_EMU_IMG="${BUILDER#android-ndk-}"
    . "${MONOREPO_ROOT}/libcxx/utils/ci/vendor/android/emulator-functions.sh"
    if ! validate_emu_img "${ANDROID_EMU_IMG}"; then
        error "android-ndk suffix must be a valid emulator image (${ANDROID_EMU_IMG})" >&2
        exit 1
    fi
    ARCH=$(arch_of_emu_img ${ANDROID_EMU_IMG})

    # Use the Android compiler by default.
    export CC=${CC:-/opt/android/clang/clang-current/bin/clang}
    export CXX=${CXX:-/opt/android/clang/clang-current/bin/clang++}

    # The NDK libc++_shared.so is always built against the oldest supported API
    # level. When tests are run against a device with a newer API level, test
    # programs can be built for any supported API level, but building for the
    # newest API (i.e. the system image's API) is probably the most interesting.
    PARAMS="executor=${MONOREPO_ROOT}/libcxx/utils/adb_run.py;target_triple=$(triple_of_arch ${ARCH})$(api_of_emu_img ${ANDROID_EMU_IMG})"
    generate-cmake-android -C "${MONOREPO_ROOT}/runtimes/cmake/android/Arch-${ARCH}.cmake" \
                           -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AndroidNDK.cmake" \
                           -DCMAKE_SYSROOT=/opt/android/ndk/sysroot \
                           -DLIBCXX_TEST_PARAMS="${PARAMS}" \
                           -DLIBCXXABI_TEST_PARAMS="${PARAMS}"
    check-abi-list
    ${NINJA} -vC "${BUILD_DIR}" install-cxx install-cxxabi

    # Start the emulator and make sure we can connect to the adb server running
    # inside of it.
    "${MONOREPO_ROOT}/libcxx/utils/ci/vendor/android/start-emulator.sh" ${ANDROID_EMU_IMG}
    trap "${MONOREPO_ROOT}/libcxx/utils/ci/vendor/android/stop-emulator.sh" EXIT
    . "${MONOREPO_ROOT}/libcxx/utils/ci/vendor/android/setup-env-for-emulator.sh"

    # Create adb_run early to avoid concurrent `mkdir -p` of common parent
    # directories.
    adb shell mkdir -p /data/local/tmp/adb_run
    adb push "${BUILD_DIR}/lib/libc++_shared.so" /data/local/tmp/libc++/libc++_shared.so
    step "Running the libc++ tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxx
    step "Running the libc++abi tests"
    ${NINJA} -vC "${BUILD_DIR}" check-cxxabi
;;
#################################################################
# Insert vendor-specific internal configurations below.
#
# This allows vendors to extend this file with their own internal
# configurations without running into merge conflicts with upstream.
#################################################################

#################################################################
*)
    echo "${BUILDER} is not a known configuration"
    exit 1
;;
esac

endstep # Make sure we close any still-open output group