[asan] Fix "Undefined symbols for architecture armv7: __Unwind_RaiseException"

[eugenis]

Do we need to change other sanitizers?

[kubamracek]

Is this for a Darwin failure? See r326150, which I just committed.

[vitalybuka]

use _Unwind_Backtrace

[vitalybuka]

In D43793#1020014, @kubamracek wrote:

Is this for a Darwin failure? See r326150, which I just committed.

Yes. Thank you.

compiler-rt/cmake/config-ix.cmake

 
 # Symbols.
 check_symbol_exists(__func__ "" COMPILER_RT_HAS_FUNC_SYMBOL)
 
 # Libraries.
 check_library_exists(dl dlopen "" COMPILER_RT_HAS_LIBDL)
 check_library_exists(rt shm_open "" COMPILER_RT_HAS_LIBRT)
 check_library_exists(m pow "" COMPILER_RT_HAS_LIBM)
+check_library_exists(unwind _Unwind_Backtrace "" COMPILER_RT_HAS_LIBUNWIND)
 check_library_exists(pthread pthread_create "" COMPILER_RT_HAS_LIBPTHREAD)
 if (ANDROID AND COMPILER_RT_HAS_LIBDL)
   # Android's libstdc++ has a dependency on libdl.
   list(APPEND CMAKE_REQUIRED_LIBRARIES dl)
 endif()
 check_library_exists(stdc++ __cxa_throw "" COMPILER_RT_HAS_LIBSTDCXX)
 
 # Linker flags.

compiler-rt/lib/asan/CMakeLists.txt

append_list_if(COMPILER_RT_HAS_FTLS_MODEL_INITIAL_EXEC
   -ftls-model=initial-exec ASAN_DYNAMIC_CFLAGS)
 append_list_if(MSVC /DEBUG ASAN_DYNAMIC_LINK_FLAGS)
 
 set(ASAN_DYNAMIC_LIBS ${SANITIZER_CXX_ABI_LIBRARY} ${SANITIZER_COMMON_LINK_LIBS})
 
 append_list_if(COMPILER_RT_HAS_LIBDL dl ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBRT rt ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBM m ASAN_DYNAMIC_LIBS)
+append_list_if(COMPILER_RT_HAS_LIBUNWIND unwind ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBPTHREAD pthread ASAN_DYNAMIC_LIBS)
 append_list_if(COMPILER_RT_HAS_LIBLOG log ASAN_DYNAMIC_LIBS)
 
 # Compile ASan sources into an object library.
 
 add_compiler_rt_object_libraries(RTAsan_dynamic
   OS ${SANITIZER_COMMON_SUPPORTED_OS}
   ARCHS ${ASAN_SUPPORTED_ARCH}