1 files changed, 130 insertions, 0 deletions
diff --git a/cmake/Modules/HandleOutOfTreeLLVM.cmake b/cmake/Modules/HandleOutOfTreeLLVM.cmake
new file mode 100644
index 0000000..1dcaf90
--- /dev/null
+++ b/cmake/Modules/HandleOutOfTreeLLVM.cmake
@@ -0,0 +1,130 @@
+macro(find_llvm_parts)
+# Rely on llvm-config.
+  set(CONFIG_OUTPUT)
+  if(NOT LLVM_CONFIG_PATH)
+    find_program(LLVM_CONFIG_PATH "llvm-config")
+  endif()
+  if(DEFINED LLVM_PATH)
+    set(LLVM_INCLUDE_DIR ${LLVM_INCLUDE_DIR} CACHE PATH "Path to llvm/include")
+    set(LLVM_PATH ${LLVM_PATH} CACHE PATH "Path to LLVM source tree")
+    set(LLVM_MAIN_SRC_DIR ${LLVM_PATH})
+    set(LLVM_CMAKE_PATH "${LLVM_PATH}/cmake/modules")
+  elseif(LLVM_CONFIG_PATH)
+    message(STATUS "Found LLVM_CONFIG_PATH as ${LLVM_CONFIG_PATH}")
+    set(LIBCXXABI_USING_INSTALLED_LLVM 1)
+    set(CONFIG_COMMAND ${LLVM_CONFIG_PATH}
+      "--includedir"
+      "--prefix"
+      "--src-root")
+    execute_process(
+      COMMAND ${CONFIG_COMMAND}
+      RESULT_VARIABLE HAD_ERROR
+      OUTPUT_VARIABLE CONFIG_OUTPUT
+    )
+    if(NOT HAD_ERROR)
+      string(REGEX REPLACE
+        "[ \t]*[\r\n]+[ \t]*" ";"
+        CONFIG_OUTPUT ${CONFIG_OUTPUT})
+    else()
+      string(REPLACE ";" " " CONFIG_COMMAND_STR "${CONFIG_COMMAND}")
+      message(STATUS "${CONFIG_COMMAND_STR}")
+      message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
+    endif()
+
+    list(GET CONFIG_OUTPUT 0 INCLUDE_DIR)
+    list(GET CONFIG_OUTPUT 1 LLVM_OBJ_ROOT)
+    list(GET CONFIG_OUTPUT 2 MAIN_SRC_DIR)
+
+    set(LLVM_INCLUDE_DIR ${INCLUDE_DIR} CACHE PATH "Path to llvm/include")
+    set(LLVM_BINARY_DIR ${LLVM_OBJ_ROOT} CACHE PATH "Path to LLVM build tree")
+    set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
+
+    # --cmakedir is supported since llvm r291218 (4.0 release)
+    execute_process(
+      COMMAND ${LLVM_CONFIG_PATH} --cmakedir
+      RESULT_VARIABLE HAD_ERROR
+      OUTPUT_VARIABLE CONFIG_OUTPUT
+      ERROR_QUIET)
+    if(NOT HAD_ERROR)
+      string(STRIP "${CONFIG_OUTPUT}" LLVM_CMAKE_PATH)
+    else()
+      set(LLVM_CMAKE_PATH
+          "${LLVM_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm")
+    endif()
+  else()
+    set(LLVM_FOUND OFF)
+    message(WARNING "UNSUPPORTED LIBCXXABI CONFIGURATION DETECTED: "
+                    "llvm-config not found and LLVM_PATH not defined.\n"
+                    "Reconfigure with -DLLVM_CONFIG_PATH=path/to/llvm-config "
+                    "or -DLLVM_PATH=path/to/llvm-source-root.")
+    return()
+  endif()
+
+  if (EXISTS "${LLVM_CMAKE_PATH}")
+    list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
+  elseif (EXISTS "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+    list(APPEND CMAKE_MODULE_PATH "${LLVM_MAIN_SRC_DIR}/cmake/modules")
+  else()
+    set(LLVM_FOUND OFF)
+    message(WARNING "Neither ${LLVM_CMAKE_PATH} nor ${LLVM_MAIN_SRC_DIR}/cmake/modules found")
+    return()
+  endif()
+
+  set(LLVM_FOUND ON)
+endmacro(find_llvm_parts)
+
+macro(configure_out_of_tree_llvm)
+  message(STATUS "Configuring for standalone build.")
+  set(LIBCXXABI_STANDALONE_BUILD 1)
+
+  find_llvm_parts()
+
+  # Add LLVM Functions --------------------------------------------------------
+  if (LLVM_FOUND AND LIBCXXABI_USING_INSTALLED_LLVM)
+    include(LLVMConfig) # For TARGET_TRIPLE
+  else()
+    if (WIN32)
+      set(LLVM_ON_UNIX 0)
+      set(LLVM_ON_WIN32 1)
+    else()
+      set(LLVM_ON_UNIX 1)
+      set(LLVM_ON_WIN32 0)
+    endif()
+  endif()
+  if (LLVM_FOUND)
+    include(AddLLVM OPTIONAL)
+  endif()
+
+  # LLVM Options --------------------------------------------------------------
+  if (NOT DEFINED LLVM_INCLUDE_TESTS)
+    set(LLVM_INCLUDE_TESTS ${LLVM_FOUND})
+  endif()
+  if (NOT DEFINED LLVM_INCLUDE_DOCS)
+    set(LLVM_INCLUDE_DOCS ${LLVM_FOUND})
+  endif()
+  if (NOT DEFINED LLVM_ENABLE_SPHINX)
+    set(LLVM_ENABLE_SPHINX OFF)
+  endif()
+
+  # Required LIT Configuration ------------------------------------------------
+  # Define the default arguments to use with 'lit', and an option for the user
+  # to override.
+  set(LIT_ARGS_DEFAULT "-sv --show-xfail --show-unsupported")
+  if (MSVC OR XCODE)
+    set(LIT_ARGS_DEFAULT "${LIT_ARGS_DEFAULT} --no-progress-bar")
+  endif()
+  set(LLVM_LIT_ARGS "${LIT_ARGS_DEFAULT}" CACHE STRING "Default options for lit")
+
+  # Required doc configuration
+  if (LLVM_ENABLE_SPHINX)
+    find_package(Sphinx REQUIRED)
+  endif()
+
+  if (LLVM_ON_UNIX AND NOT APPLE)
+    set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
+  else()
+    set(LLVM_HAVE_LINK_VERSION_SCRIPT 0)
+  endif()
+endmacro(configure_out_of_tree_llvm)
+
+configure_out_of_tree_llvm()