From 2d99b052457b78753313704338a9edbb1561ab36 Mon Sep 17 00:00:00 2001
From: wangzehong <wangzehong2@huawei.com>
Date: Thu, 16 Feb 2023 16:48:37 +0800
Subject: [PATCH] modify to standalone build

---
 CMakeLists.txt      | 34 +++++++++++++++++++++++++++++-----
 docs/CMakeLists.txt |  1 +
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/libunwind-12.0.1.src/CMakeLists.txt b/libunwind-12.0.1.src/CMakeLists.txt
index 570b8db..14e1b11 100644
--- a/libunwind-12.0.1.src/CMakeLists.txt
+++ b/libunwind-12.0.1.src/CMakeLists.txt
@@ -1,6 +1,3 @@
-if (NOT IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/../libcxx")
-  message(FATAL_ERROR "libunwind requires being built in a monorepo layout with libcxx available")
-endif()
 
 #===============================================================================
 # Setup Project
@@ -37,9 +34,36 @@ if (CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR OR LIBUNWIND_STANDALONE_B
   # the configurator should write the script into.
   set(LIBUNWIND_STANDALONE_BUILD 1)
   set(LLVM_LIT_OUTPUT_DIR "${LIBUNWIND_BINARY_DIR}/bin")
+  find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
+  if(NOT LLVM_CONFIG_PATH)
+    message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
+  endif()
+
+  execute_process(COMMAND "${LLVM_CONFIG_PATH}"
+                          "--obj-root"
+                          "--includedir"
+                          "--cmakedir"
+                          "--src-root"
+                  RESULT_VARIABLE HAD_ERROR
+                  OUTPUT_VARIABLE LLVM_CONFIG_OUTPUT
+                  OUTPUT_STRIP_TRAILING_WHITESPACE)
+  if(HAD_ERROR)
+    message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
+  endif()
+
+  string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" LLVM_CONFIG_OUTPUT "${LLVM_CONFIG_OUTPUT}")
+
+  list(GET LLVM_CONFIG_OUTPUT 0 OBJ_ROOT)
+  list(GET LLVM_CONFIG_OUTPUT 1 MAIN_INCLUDE_DIR)
+  list(GET LLVM_CONFIG_OUTPUT 2 LLVM_CMAKE_PATH)
+  list(GET LLVM_CONFIG_OUTPUT 3 MAIN_SRC_DIR)
+
+  if(NOT EXISTS "${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
+    message(FATAL_ERROR "LLVMConfig.cmake not found")
+  endif()
+  include("${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
 
-  # Find the LLVM sources and simulate LLVM CMake options.
-  include(HandleOutOfTreeLLVM)
+  list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
 else()
   set(LLVM_LIT "${CMAKE_SOURCE_DIR}/utils/lit/lit.py")
 endif()
diff --git a/libunwind-12.0.1.src/docs/CMakeLists.txt b/libunwind-12.0.1.src/docs/CMakeLists.txt
index c226f2f..17fb075 100644
--- a/libunwind-12.0.1.src/docs/CMakeLists.txt
+++ b/libunwind-12.0.1.src/docs/CMakeLists.txt
@@ -2,6 +2,7 @@ include(FindSphinx)
 if (SPHINX_FOUND)
   include(AddSphinxTarget)
+  include(AddLLVM)
   if (${SPHINX_OUTPUT_HTML})
     add_sphinx_target(html libunwind)
   endif()
 endif()
-- 
2.33.1.windows.1