Bug #119239 Compilation error with clang 21 / XCode

Description:
CMake options: -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DFORCE_UNSUPPORTED_COMPILER=ON -DBUILD_CONFIG=mysql_release -DCMAKE_BUILD_TYPE=Release -DMYSQL_MAINTAINER_MODE=ON -DWITH_SYSTEM_LIBS=ON -DWITH_NDBCLUSTER_STORAGE_ENGINE=OFF -DDOWNLOAD_BOOST=ON -DWITH_BOOST=(path) -DFORCE_COLORED_OUTPUT=ON -DCMAKE_CXX_FLAGS=-Wno-invalid-specialization -g -DCMAKE_CXX_FLAGS_DEBUG=-Wno-invalid-specialization -g -DCMAKE_CXX_FLAGS_RELEASE=-O2 -DNDEBUG -Wno-invalid-specialization -g

with Homebrew-packaged LLVM 21 result in

FAILED: [code=1] scripts/CMakeFiles/comp_sql.dir/comp_sql.cc.o
/opt/homebrew/opt/llvm/bin/clang++ -DBOOST_NO_CXX98_FUNCTION_BASE -DHAVE_TLSv13 -DLZ4_DISABLE_DEPRECATE_WARNINGS -D_USE_MATH_DEFINES -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/Users/laurynas/vilniusdb/mysql-8.0.44/_build-release-llvm -I/Users/laurynas/vilniusdb/mysql-8.0.44/_build-release-llvm/include -I/Users/laurynas/vilniusdb/mysql-8.0.44 -I/Users/laurynas/vilniusdb/mysql-8.0.44/include -isystem /Users/laurynas/vilniusdb/mysql-8.0.44/extra/rapidjson/include -isystem /opt/homebrew/opt/openssl@1.1/include -isystem /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/editline -isystem /opt/homebrew/include -std=c++17 -fno-omit-frame-pointer -ftls-model=initial-exec -Wno-invalid-specialization -g -Wall -Wextra -Wformat-security -Wvla -Wundef -Wmissing-format-attribute -Woverloaded-virtual -Wcast-qual -Wno-null-conversion -Wno-unused-private-field -Wconditional-uninitialized -Wdeprecated -Wno-deprecated-declarations -Wno-shorten-64-to-32 -Wextra-semi -Wheader-hygiene -Wnon-virtual-dtor -Wundefined-reinterpret-cast -Wrange-loop-analysis -Winconsistent-missing-destructor-override -Winconsistent-missing-override -Wshadow-field -Werror -ffunction-sections -fdata-sections -O2 -DNDEBUG -Wno-invalid-specialization -g -arch arm64 -fPIE -fcolor-diagnostics -MD -MT scripts/CMakeFiles/comp_sql.dir/comp_sql.cc.o -MF scripts/CMakeFiles/comp_sql.dir/comp_sql.cc.o.d  --language=c++  -o scripts/CMakeFiles/comp_sql.dir/comp_sql.cc.o -c /Users/laurynas/vilniusdb/mysql-8.0.44/scripts/comp_sql.cc
In file included from /Users/laurynas/vilniusdb/mysql-8.0.44/scripts/comp_sql.cc:37:
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:728:42: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
  728 |       &state, key, PSI_FILE_STAT, path, &locker);
      |                                          ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:943:48: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
  943 |       &state, key, PSI_FILE_CREATE, filename, &locker);
      |                                                ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:967:47: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
  967 |       &state, key, PSI_FILE_CREATE, nullptr, &locker);
      |                                               ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:992:46: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
  992 |       &state, key, PSI_FILE_OPEN, filename, &locker);
      |                                              ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:1200:44: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 1200 |       &state, key, PSI_FILE_DELETE, name, &locker);
      |                                            ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:1223:44: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 1223 |       &state, key, PSI_FILE_RENAME, from, &locker);
      |                                            ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:1248:48: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 1248 |       &state, key, PSI_FILE_CREATE, filename, &locker);
      |                                                ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:1273:44: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 1273 |       &state, key, PSI_FILE_DELETE, name, &locker);
      |                                            ^~~~~~
/Users/laurynas/vilniusdb/mysql-8.0.44/include/mysql/psi/mysql_file.h:1296:44: error: variable 'locker' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer]
 1296 |       &state, key, PSI_FILE_RENAME, from, &locker);
      |                                            ^~~~~~

How to repeat:
See above

With -Wno-uninitialized-const-pointer the build stops at

[324/3757] Linking CXX executable runtime_output_directory/comp_client_err
FAILED: [code=1] runtime_output_directory/comp_client_err
: && /opt/homebrew/opt/llvm/bin/clang++ -std=c++17 -fno-omit-frame-pointer -ftls-model=initial-exec -Wno-invalid-specialization -Wno-uninitialized-const-pointer -g -Wall -Wextra -Wformat-security -Wvla -Wundef -Wmissing-format-attribute -Woverloaded-virtual -Wcast-qual -Wno-null-conversion -Wno-unused-private-field -Wconditional-uninitialized -Wdeprecated -Wno-deprecated-declarations -Wno-shorten-64-to-32 -Wextra-semi -Wheader-hygiene -Wnon-virtual-dtor -Wundefined-reinterpret-cast -Wrange-loop-analysis -Winconsistent-missing-destructor-override -Winconsistent-missing-override -Wshadow-field -Werror -ffunction-sections -fdata-sections -O2 -DNDEBUG -Wno-invalid-specialization -Wno-uninitialized-const-pointer -g -arch arm64 -Wl,-search_paths_first -Wl,-headerpad_max_install_names -Xlinker -no_warn_duplicate_libraries utilities/CMakeFiles/comp_client_err.dir/comp_client_err.cc.o utilities/CMakeFiles/comp_client_err.dir/__/libmysql/errmsg.cc.o -o runtime_output_directory/comp_client_err  archive_output_directory/libmysys.a  archive_output_directory/libstrings.a  archive_output_directory/libmysys.a  archive_output_directory/libstrings.a  archive_output_directory/libmytime.a  archive_output_directory/libzlib.a  /opt/homebrew/lib/libzstd.dylib  /opt/homebrew/opt/openssl@1.1/lib/libssl.dylib  /opt/homebrew/opt/openssl@1.1/lib/libcrypto.dylib && cd /Users/laurynas/vilniusdb/mysql-8.0.44/_build-release-llvm/utilities && codesign --sign - --preserve-metadata=entitlements --force --entitlements /Users/laurynas/vilniusdb/mysql-8.0.44/_build-release-llvm/dev.entitlements /Users/laurynas/vilniusdb/mysql-8.0.44/_build-release-llvm/runtime_output_directory/comp_client_err
Undefined symbols for architecture arm64:
  "std::__1::__hash_memory(void const*, unsigned long)", referenced from:
      std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, int>, void*>*> std::__1::__hash_table<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, int>, std::__1::__unordered_map_hasher<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, true>, std::__1::__unordered_map_equal<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, true>, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>>>::find<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&) in libmysys.a[3](charset.cc.o)
      std::__1::pair<std::__1::__hash_iterator<std::__1::__hash_node<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, int>, void*>*>, bool> std::__1::__hash_table<std::__1::__hash_value_type<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, int>, std::__1::__unordered_map_hasher<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, true>, std::__1::__unordered_map_equal<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>, std::__1::equal_to<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, std::__1::hash<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>>, true>, std::__1::allocator<std::__1::pair<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const, int>>>::__emplace_unique_key_args<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>, std::__1::piecewise_construct_t const&, std::__1::tuple<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&&>, std::__1::tuple<>>(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&, std::__1::piecewise_construct_t const&, std::__1::tuple<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>>&&>&&, std::__1::tuple<>&&) in libmysys.a[3](charset.cc.o)
ld: symbol(s) not found for architecture arm64
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

8.4.7 is also affected, and the workaround allows the build to proceed until bug 119242

Same with 8.0.45

Same with 8.4.8, which in addition started being affected by bug 119246

Same with 8.0.46 with current XCode

Same with 8.4.9 with current XCode