[cmake] [libunwind] Fix find_path() problems when cross compiling
When CMAKE_SYSROOT or CMAKE_FIND_ROOT_PATH is set, cmake
recommends setting CMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY
globally which means find_path() always prepends CMAKE_SYSROOT or
CMAKE_FIND_ROOT_PATH to all paths used in the search.
However, this find_path() invocation is looking for a path in the
libcxx project on the host system, not the target system,
which can be done by passing NO_CMAKE_FIND_ROOT_PATH.
Differential Revision: https://reviews.llvm.org/D41621
git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@323141 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c6a2e6..3a132be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -329,7 +329,8 @@
PATHS ${LLVM_MAIN_SRC_DIR}/projects/libcxx/include
${LLVM_MAIN_SRC_DIR}/runtimes/libcxx/include
NO_DEFAULT_PATH
-)
+ NO_CMAKE_FIND_ROOT_PATH
+ )
if ((NOT LIBUNWIND_STANDALONE_BUILD OR HAVE_LIBCXX) AND
IS_DIRECTORY "${LIBUNWIND_LIBCXX_INCLUDES_INTERNAL}")
set(LIBUNWIND_CXX_INCLUDE_PATHS_DEFAULT "${LIBUNWIND_LIBCXX_INCLUDES_INTERNAL}")
