[runtimes] Allow FOO_TEST_CONFIG to be a relative path

[ldionne]

Summary

That makes it possible to store that value in a CMake cache if needed.

[ldionne]

Rebase onto main

[ldionne]

Rebase onto main

libcxx/CMakeLists.txt

option(LIBCXX_ENABLE_VENDOR_AVAILABILITY_ANNOTATIONS
    to provide compile-time errors when using features unavailable on some version of
    the shared library they shipped should turn this on and see `include/__availability`
    for more details." OFF)
 option(LIBCXX_ENABLE_INCOMPLETE_FEATURES
     "Whether to enable support for incomplete library features. Incomplete features
     are new library features under development. These features don't guarantee
     ABI stability nor the quality of completed library features. Vendors
     shipping the library may want to disable this option." ON)
-set(LIBCXX_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/configs/legacy.cfg.in" CACHE STRING
-    "The Lit testing configuration to use when running the tests.")
+set(LIBCXX_TEST_CONFIG "legacy.cfg.in" CACHE STRING
+    "The path to the Lit testing configuration to use when running the tests.
+     If a relative path is provided, it is assumed to be relative to '<monorepo>/libcxx/test/configs'.")
+if (NOT IS_ABSOLUTE "${LIBCXX_TEST_CONFIG}")
+  set(LIBCXX_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/configs/${LIBCXX_TEST_CONFIG}")
+endif()
 set(LIBCXX_TEST_PARAMS "" CACHE STRING
     "A list of parameters to run the Lit test suite with.")
 
 # Benchmark options -----------------------------------------------------------
 option(LIBCXX_INCLUDE_BENCHMARKS "Build the libc++ benchmarks and their dependencies" ON)
 
 set(LIBCXX_BENCHMARK_TEST_ARGS_DEFAULT --benchmark_min_time=0.01)
 set(LIBCXX_BENCHMARK_TEST_ARGS "${LIBCXX_BENCHMARK_TEST_ARGS_DEFAULT}" CACHE STRING

libcxx/utils/ci/apple-install-libcxx.sh

(cd "${build_dir}/${arch}" &&
             -DCMAKE_MAKE_PROGRAM="$(xcrun --sdk "${sdk}" --find ninja)" \
             -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi" \
             -C "${llvm_root}/libcxx/cmake/caches/Apple.cmake" \
             -DCMAKE_INSTALL_PREFIX="${build_dir}/${arch}-install" \
             -DCMAKE_INSTALL_NAME_DIR="/usr/lib" \
             -DCMAKE_OSX_ARCHITECTURES="${arch}" \
             -DLIBCXXABI_LIBRARY_VERSION="${version}" \
             -DLIBCXX_INCLUDE_BENCHMARKS=OFF \
-            -DLIBCXX_TEST_CONFIG="${llvm_root}/libcxx/test/configs/apple-libc++-shared.cfg.in"
+            -DLIBCXX_TEST_CONFIG="apple-libc++-shared.cfg.in"
     )
 
     xcrun --sdk "${sdk}" cmake --build "${build_dir}/${arch}" --target install-cxx install-cxxabi -- -v
 done
 
 function universal_dylib() {
     dylib=${1}
 

libcxx/utils/ci/run-buildbot

check-generated-output)
     ! grep -rn '[^ -~]' libcxx/include/ || false
 
     # Reject patches that introduce dependency cycles in the headers.
     python3 libcxx/utils/graph_header_deps.py >/dev/null
 ;;
 generic-cxx03)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx03.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-cxx11)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx11.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-cxx14)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx14.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-cxx17)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx17.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-cxx20)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx20.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-cxx2b)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx2b.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-assertions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-assertions.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-debug-iterators)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-debug-iterators.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
     check-abi-list
 ;;
 generic-noexceptions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-noexceptions.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-modules)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-modules.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-static)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-static.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-static.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-static.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-32bit)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-32bits.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-clang-11)
     export CC=clang-11
     export CXX=clang++-11
     clean
-    generate-cmake -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+    generate-cmake -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-clang-12)
     export CC=clang-12
     export CXX=clang++-12
     clean
-    generate-cmake -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+    generate-cmake -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-gcc)
     export CC=gcc-11
     export CXX=g++-11
     clean
     generate-cmake
     check-cxx-cxxabi
 ;;
 generic-gcc-cxx11)
     export CC=gcc-11
     export CXX=g++-11
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-cxx11.cmake"
     check-cxx-cxxabi
 ;;
 generic-asan)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-asan.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-msan)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-msan.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-tsan)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-tsan.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-ubsan)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-ubsan.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-with_llvm_unwinder)
     clean
     generate-cmake -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-singlethreaded)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-singlethreaded.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-no-debug)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-debug.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-no-filesystem)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-filesystem.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-no-random_device)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-random_device.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-no-localization)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-localization.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 generic-no-unicode)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-no-unicode.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 x86_64-apple-system)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/apple-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="apple-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 x86_64-apple-system-noexceptions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_ENABLE_EXCEPTIONS=OFF \
                    -DLIBCXXABI_ENABLE_EXCEPTIONS=OFF \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/apple-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="apple-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 x86_64-apple-system-backdeployment-*)
     clean
 
     if [[ "${OSX_ROOTS}" == "" ]]; then
         echo "--- Downloading previous macOS dylibs"
         PREVIOUS_DYLIBS_URL="https://dl.dropboxusercontent.com/s/liu4fmc53qzlfly/libcxx-roots.tar.gz"
x86_64-apple-system-backdeployment-*)
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Apple.cmake" \
                    -DLIBCXX_TEST_PARAMS="${PARAMS}" \
                    -DLIBCXXABI_TEST_PARAMS="${PARAMS}"
 
     check-cxx-cxxabi
 ;;
 benchmarks)
     clean
-    generate-cmake -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+    generate-cmake -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-benchmarks
 ;;
 documentation)
     clean
     generate-cmake -DLLVM_ENABLE_SPHINX=ON
 
     echo "+++ Generating documentation"
     ${NINJA} -vC "${BUILD_DIR}" docs-libcxx-html
 ;;
 unified-standalone)
-
     clean
 
     echo "--- Generating CMake"
     ${CMAKE} \
           -S "${MONOREPO_ROOT}/libcxx/utils/ci/runtimes" \
           -B "${BUILD_DIR}" \
           -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
           -DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi;libunwind" \
-          -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+          -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
 
     check-cxx-cxxabi
 ;;
 new-standalone)
-
     clean
 
     echo "--- Generating CMake"
     ${CMAKE} \
           -S "${MONOREPO_ROOT}/runtimes" \
           -B "${BUILD_DIR}" \
           -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
           -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
-          -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+          -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
 
     check-cxx-cxxabi
 ;;
 runtimes-build)
     clean
 
     echo "--- Generating CMake"
     # TODO: We currently enable modules and assertions in the runtimes build
     #       because that provides coverage for some specific Clang failures
     #       we've been seeing recently, however it would be better to instead
     #       run all CI configurations against a Clang that has assertions enabled.
     ${CMAKE} \
           -S "${MONOREPO_ROOT}/llvm" \
           -B "${BUILD_DIR}" \
           -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
           -DLLVM_ENABLE_PROJECTS="clang" \
           -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" \
           -DLLVM_RUNTIME_TARGETS="x86_64-unknown-linux-gnu" \
           -DLLVM_ENABLE_ASSERTIONS=ON \
           -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Generic-modules.cmake" \
-          -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+          -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
 
     echo "+++ Running the libc++ and libc++abi tests"
     ${NINJA} -C "${BUILD_DIR}" check-runtimes
 
     echo "--- Installing libc++ and libc++abi to a fake location"
     ${NINJA} -C "${BUILD_DIR}" install-runtimes
 ;;
 legacy-test-config)
     clean
-    generate-cmake -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/legacy.cfg.in"
+    generate-cmake -DLIBCXX_TEST_CONFIG="legacy.cfg.in"
     check-cxx-cxxabi
 ;;
 legacy-standalone)
     clean
 
     echo "--- Generating CMake"
     ${CMAKE} \
           -S "${MONOREPO_ROOT}/libcxx" \
legacy-standalone)
     ${NINJA} -vC "${BUILD_DIR}/libcxx" check-cxx
 
     echo "+++ Running the libc++abi tests"
     ${NINJA} -vC "${BUILD_DIR}/libcxxabi" check-cxxabi
 ;;
 aarch64)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AArch64.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 aarch64-noexceptions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/AArch64.cmake" \
                    -DLIBCXX_ENABLE_EXCEPTIONS=OFF \
                    -DLIBCXXABI_ENABLE_EXCEPTIONS=OFF \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 # Aka Armv8 32 bit
 armv8)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv8Arm.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 armv8-noexceptions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv8Thumb-noexceptions.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 # Armv7 32 bit. One building Arm only one Thumb only code.
 armv7)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7Arm.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 armv7-noexceptions)
     clean
     generate-cmake -C "${MONOREPO_ROOT}/libcxx/cmake/caches/Armv7Thumb-noexceptions.cmake" \
-                   -DLIBCXX_TEST_CONFIG="${MONOREPO_ROOT}/libcxx/test/configs/llvm-libc++-shared.cfg.in"
+                   -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in"
     check-cxx-cxxabi
 ;;
 windows-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

libcxxabi/CMakeLists.txt

else()
     target_compile_options(cxx-headers INTERFACE -I "${LIBCXXABI_LIBCXX_INCLUDES}")
   endif()
 endif()
 
 option(LIBCXXABI_HERMETIC_STATIC_LIBRARY
   "Do not export any symbols from the static library." OFF)
 
 set(LIBCXXABI_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/lit.site.cfg.in" CACHE STRING
-    "The Lit testing configuration to use when running the tests.")
+  "The path to the Lit testing configuration to use when running the tests.
+   If a relative path is provided, it is assumed to be relative to '<monorepo>/libcxx/test/configs'.")
+if (NOT IS_ABSOLUTE "${LIBCXXABI_TEST_CONFIG}")
+  set(LIBCXXABI_TEST_CONFIG "${LIBCXXABI_LIBCXX_PATH}/test/configs/${LIBCXXABI_TEST_CONFIG}")
+endif()
 set(LIBCXXABI_TEST_PARAMS "" CACHE STRING
     "A list of parameters to run the Lit test suite with.")
 
 #===============================================================================
 # Configure System
 #===============================================================================
 
 # Add path for custom modules

libunwind/CMakeLists.txt

 set(LIBUNWIND_TARGET_TRIPLE "${LLVM_DEFAULT_TARGET_TRIPLE}" CACHE STRING "Target triple for cross compiling.")
 set(LIBUNWIND_GCC_TOOLCHAIN "" CACHE PATH "GCC toolchain for cross compiling.")
 set(LIBUNWIND_SYSROOT "" CACHE PATH "Sysroot for cross compiling.")
 set(LIBUNWIND_TEST_LINKER_FLAGS "" CACHE STRING
     "Additional linker flags for test programs.")
 set(LIBUNWIND_TEST_COMPILER_FLAGS "" CACHE STRING
     "Additional compiler flags for test programs.")
 set(LIBUNWIND_TEST_CONFIG "${CMAKE_CURRENT_SOURCE_DIR}/test/lit.site.cfg.in" CACHE STRING
-    "The Lit testing configuration to use when running the tests.")
+  "The path to the Lit testing configuration to use when running the tests.
+   If a relative path is provided, it is assumed to be relative to '<monorepo>/libcxx/test/configs'.")
+if (NOT IS_ABSOLUTE "${LIBUNWIND_TEST_CONFIG}")
+  set(LIBUNWIND_TEST_CONFIG "${LIBUNWIND_LIBCXX_PATH}/test/configs/${LIBUNWIND_TEST_CONFIG}")
+endif()
 set(LIBUNWIND_TEST_PARAMS "" CACHE STRING
     "A list of parameters to run the Lit test suite with.")
 
 if (NOT LIBUNWIND_ENABLE_SHARED AND NOT LIBUNWIND_ENABLE_STATIC)
   message(FATAL_ERROR "libunwind must be built as either a shared or static library.")
 endif()
 
 if (LIBUNWIND_ENABLE_CET AND MSVC)