!3 Add llvm-libunwind-12.0.1 source code and build script

From: @lukewzh 
Reviewed-by: @eastb233 
Signed-off-by: @eastb233

0001-libunwind-standalone-build.patch

@@ -0,0 +1,74 @@
+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

libunwind.spec

@@ -0,0 +1,80 @@
+%global maj_ver 12
+%global min_ver 0
+%global patch_ver 1
+%global debug_package %{nil}
+
+Name:           llvm-libunwind
+Version:        12.0.1
+Release:        1
+Summary:        LLVM "libunwind" runtime libraries
+License:        BSD
+URL:            http://llvm.org
+Source0:        https://github.com/llvm/llvm-project/releases/download/llvmorg-%{version}/libunwind-%{version}.src.tar.xz
+
+Patch0:         0001-libunwind-standalone-build.patch
+
+BuildRequires:  gcc
+BuildRequires:  gcc-c++
+BuildRequires:  cmake
+BuildRequires:  python3
+BuildRequires:  llvm-devel
+
+%description
+The libunwind-devel package includes the libraries and header files for
+libunwind.
+
+%package devel
+Summary:    LLVM libunwind development files
+Provides:   libunwind(major) = %{maj_ver}
+Requires:   %{name}%{?_isa} = %{version}-%{release}
+ 
+%description devel
+Static and unversioned shared libraries for LLVM libunwind
+
+
+%prep
+%autosetup -n libunwind-%{version}.src -p2
+
+%build
+mkdir -p _build
+cd _build
+
+cmake \
+        -DLLVM_CMAKE_PATH=%{_libdir}/cmake/llvm \
+        -DCMAKE_INSTALL_PREFIX=%{_prefix} \
+        -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+        -DLIBUNWIND_ENABLE_STATIC=OFF \
+%if 0%{?__isa_bits} == 64
+        -DLLVM_LIBDIR_SUFFIX=64 \
+%else
+        -DLLVM_LIBDIR_SUFFIX= \
+%endif
+  ..
+
+%make_build
+
+%install
+cd _build
+%make_install
+
+# We can't install on default location because that would conflict with
+# https://gitee.com/src-openeuler/libunwind
+# ABI wise, even though llvm-libunwind's library is named libunwind, it doesn't
+# have the exact same ABI has gcc's libunwind (it actually provides a subset).
+mkdir -p %{buildroot}/%{_libdir}/llvm-unwind/
+mv %{buildroot}%{_libdir}/libunwind* %{buildroot}/%{_libdir}/llvm-unwind/
+ 
+
+%files
+%license LICENSE.TXT
+%dir %{_libdir}/llvm-unwind
+%{_libdir}/llvm-unwind/libunwind.so.*
+ 
+%files devel
+%{_libdir}/llvm-unwind/libunwind.so
+ 
+
+%changelog
+* Tue Feb 7 2023 Wang Zehong <wangzehong2@huawei.com> - 12.0.1-1
+- update to 12.0.1-1
+