[libc++] Move the weak symbols list to libc++abi

Those symbols are exported from libc++abi in the first place, so it
makes more sense to have them there.

libcxx/lib/weak.exp

@@ -1,16 +0,0 @@
-__ZTISt10bad_typeid
-__ZTISt11logic_error
-__ZTISt11range_error
-__ZTISt12domain_error
-__ZTISt12length_error
-__ZTISt12out_of_range
-__ZTISt13bad_exception
-__ZTISt13runtime_error
-__ZTISt14overflow_error
-__ZTISt15underflow_error
-__ZTISt16invalid_argument
-__ZTISt16nested_exception
-__ZTISt20bad_array_new_length
-__ZTISt8bad_cast
-__ZTISt9bad_alloc
-__ZTISt9exception

libcxx/src/CMakeLists.txt

@@ -210,8 +210,7 @@ if (LIBCXX_ENABLE_SHARED)
     target_link_libraries(cxx_shared PRIVATE
       "-Wl,-unexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++unexp.exp"
       "-Wl,-reexported_symbols_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/libc++abi.v${LIBCXX_LIBCPPABI_VERSION}.exp"
-      "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/notweak.exp"
-      "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/weak.exp")
+      "-Wl,-force_symbols_not_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/notweak.exp")
 
     if (NOT LIBCXX_ENABLE_NEW_DELETE_DEFINITIONS)
       target_link_libraries(cxx_shared PRIVATE

libcxxabi/lib/weak.exp

@@ -0,0 +1,7 @@
+__ZTISt11range_error
+__ZTISt12domain_error
+__ZTISt12length_error
+__ZTISt12out_of_range
+__ZTISt14overflow_error
+__ZTISt15underflow_error
+__ZTISt16invalid_argument

libcxxabi/src/CMakeLists.txt

@@ -214,6 +214,8 @@ if (LIBCXXABI_ENABLE_SHARED)
 
     export_symbols("${CMAKE_CURRENT_SOURCE_DIR}/../lib/itanium-base.exp")
 
+    target_link_libraries(cxxabi_shared PRIVATE "-Wl,-force_symbols_weak_list,${CMAKE_CURRENT_SOURCE_DIR}/../lib/weak.exp")
+
     if (LIBCXXABI_ENABLE_NEW_DELETE_DEFINITIONS)
       export_symbols("${CMAKE_CURRENT_SOURCE_DIR}/../lib/new-delete.exp")
     endif()