diff --git a/libunwind/cmake/config-ix.cmake b/libunwind/cmake/config-ix.cmake
--- a/libunwind/cmake/config-ix.cmake
+++ b/libunwind/cmake/config-ix.cmake
@@ -22,63 +22,6 @@
   endif ()
 endif()
 
-# libunwind is using -nostdlib++ at the link step when available,
-# otherwise -nodefaultlibs is used. We want all our checks to also
-# use one of these options, otherwise we may end up with an inconsistency between
-# the flags we think we require during configuration (if the checks are
-# performed without one of those options) and the flags that are actually
-# required during compilation (which has the -nostdlib++ or -nodefaultlibs). libc is
-# required for the link to go through. We remove sanitizers from the
-# configuration checks to avoid spurious link errors.
-
-llvm_check_compiler_linker_flag(CXX "-nostdlib++" CXX_SUPPORTS_NOSTDLIBXX_FLAG)
-if (CXX_SUPPORTS_NOSTDLIBXX_FLAG)
-  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nostdlib++")
-else()
-  llvm_check_compiler_linker_flag(C "-nodefaultlibs" C_SUPPORTS_NODEFAULTLIBS_FLAG)
-  if (C_SUPPORTS_NODEFAULTLIBS_FLAG)
-    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
-  endif()
-endif()
-
-if (CXX_SUPPORTS_NOSTDLIBXX_FLAG OR C_SUPPORTS_NODEFAULTLIBS_FLAG)
-  if (LIBUNWIND_HAS_C_LIB)
-    list(APPEND CMAKE_REQUIRED_LIBRARIES c)
-  endif ()
-  if (LIBUNWIND_USE_COMPILER_RT)
-    include(HandleCompilerRT)
-    find_compiler_rt_library(builtins LIBUNWIND_BUILTINS_LIBRARY
-                             FLAGS ${LIBUNWIND_COMPILE_FLAGS})
-    list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBUNWIND_BUILTINS_LIBRARY}")
-  else ()
-    if (LIBUNWIND_HAS_GCC_S_LIB)
-      list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
-    endif ()
-    if (LIBUNWIND_HAS_GCC_LIB)
-      list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)
-    endif ()
-  endif ()
-  if (MINGW)
-    # Mingw64 requires quite a few "C" runtime libraries in order for basic
-    # programs to link successfully with -nodefaultlibs.
-    if (LIBUNWIND_USE_COMPILER_RT)
-      set(MINGW_RUNTIME ${LIBUNWIND_BUILTINS_LIBRARY})
-    else ()
-      set(MINGW_RUNTIME gcc_s gcc)
-    endif()
-    set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi32
-                        shell32 user32 kernel32 mingw32 ${MINGW_RUNTIME}
-                        moldname mingwex msvcrt)
-    list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
-  endif()
-  if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
-    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")
-  endif ()
-  if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage)
-    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fsanitize-coverage=0")
-  endif ()
-endif ()
-
 # Check compiler pragmas
 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
   cmake_push_check_state()
diff --git a/libunwind/src/CMakeLists.txt b/libunwind/src/CMakeLists.txt
--- a/libunwind/src/CMakeLists.txt
+++ b/libunwind/src/CMakeLists.txt
@@ -88,11 +88,6 @@
 
 # Setup flags.
 add_link_flags_if(CXX_SUPPORTS_UNWINDLIB_EQ_NONE_FLAG --unwindlib=none)
-if (CXX_SUPPORTS_NOSTDLIBXX_FLAG)
-  add_link_flags_if_supported(-nostdlib++)
-else()
-  add_link_flags_if_supported(-nodefaultlibs)
-endif()
 
 # MINGW_LIBRARIES is defined in config-ix.cmake
 add_library_flags_if(MINGW "${MINGW_LIBRARIES}")