Firestore: pin googletest to a commit that supports c++14 in cmake builds

[dconeybe]

Before this PR, Firestore's cmake build always built against the main branch of https://github.com/google/googletest:

firebase-ios-sdk/cmake/external/googletest.cmake

Line 23 in bbd9fb3

set(version main)

This worked fine, until googletest dropped c++14 support on Feb 10, 2025 in commit google/googletest@c00fd25. Since firebase-ios-sdk requires c++14 support, this caused all sorts of build errors (see examples below). The fix in this PR is to pin googletest at the last commit that supported c++14.

FAILED: Firestore/core/test/unit/util/CMakeFiles/firestore_util_test.dir/iterator_adaptors_test.cc.o /usr/bin/ccache /usr/bin/c++ -DCARES_STATICLIB -DFIREBASE_TESTS_BUILT_BY_CMAKE -DFIRESTORE_HAVE_CONFIG_DETECTED_H -DPB_ENABLE_MALLOC -DPB_FIELD_32BIT -DPB_NO_PACKED_STRUCTS=1 -I$HOME/work/ios/main/build -I$HOME/work/ios/main -I$HOME/work/ios/main/build/external/src/abseil-cpp -I$HOME/work/ios/main/Firestore/core/include -I$HOME/work/ios/main/build/external/src/leveldb/include -I$HOME/work/ios/main/build/external/src/snappy-build -I$HOME/work/ios/main/build/external/src/snappy -I$HOME/work/ios/main/build/external/src/nanopb -I$HOME/work/ios/main/Firestore/Protos/nanopb -I$HOME/work/ios/main/build/external/src/grpc/include -I$HOME/work/ios/main/build/external/src/re2 -I$HOME/work/ios/main/build/external/src/grpc-build/third_party/cares/cares -I$HOME/work/ios/main/build/external/src/cares -I$HOME/work/ios/main/build/external/src/protobuf/src -isystem $HOME/work/ios/main/build/external/src/googletest/googletest/include -isystem $HOME/work/ios/main/build/external/src/googletest/googletest -isystem $HOME/work/ios/main/build/external/src/googletest/googlemock/include -isystem $HOME/work/ios/main/build/external/src/googletest/googlemock -isystem $HOME/local/homebrew/Cellar/openssl@3/3.4.1/include -Wno-format-zero-length -g -std=gnu++17 -Wall -Wextra -Werror -Wformat -Wuninitialized -fno-common -Wunused-function -Wunused-value -Wunused-variable -fdiagnostics-color -Wno-error=redundant-move -Wreorder -Werror=reorder -MD -MT Firestore/core/test/unit/util/CMakeFiles/firestore_util_test.dir/iterator_adaptors_test.cc.o -MF Firestore/core/test/unit/util/CMakeFiles/firestore_util_test.dir/iterator_adaptors_test.cc.o.d -o Firestore/core/test/unit/util/CMakeFiles/firestore_util_test.dir/iterator_adaptors_test.cc.o -c $HOME/work/ios/main/Firestore/core/test/unit/util/iterator_adaptors_test.cc $HOME/work/ios/main/Firestore/core/test/unit/util/iterator_adaptors_test.cc:85:41: error: ‘template<class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> struct std::iterator’ is deprecated [-Werror=deprecated-declarations] 85 | class InlineStorageIter : public std::iterator<std::input_iterator_tag, T> { | ^~~~~~~~ In file included from /usr/include/c++/14/iterator:61, from $HOME/work/ios/main/Firestore/core/src/util/iterator_adaptors.h:22, from $HOME/work/ios/main/Firestore/core/test/unit/util/iterator_adaptors_test.cc:17: /usr/include/c++/14/bits/stl_iterator_base_types.h:127:34: note: declared here 127 | struct _GLIBCXX17_DEPRECATED iterator | ^~~~~~~~ $HOME/work/ios/main/Firestore/core/test/unit/util/iterator_adaptors_test.cc:571:19: error: ‘template<class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> struct std::iterator’ is deprecated [-Werror=deprecated-declarations] 571 | : public std::iterator<std::input_iterator_tag, const int*> { | ^~~~~~~~ /usr/include/c++/14/bits/stl_iterator_base_types.h:127:34: note: declared here 127 | struct _GLIBCXX17_DEPRECATED iterator | ^~~~~~~~ cc1plus: all warnings being treated as errors 

and

FAILED: Firestore/core/test/unit/local/firestore_local_test : && /usr/bin/c++ -g -Wl,--dependency-file=Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/link.d Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/bundle_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/document_overlay_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/globals_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/index_backfiller_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/index_manager_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_bundle_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_document_overlay_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_globals_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_index_manager_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_key_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_local_store_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_lru_garbage_collector_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_migrations_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_mutation_queue_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_opener_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_overlay_migration_manager_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_query_engine_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_remote_document_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_snappy_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_target_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_transaction_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_util_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/local_serializer_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/local_store_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/lru_garbage_collector_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_bundle_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_document_overlay_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_globals_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_index_manager_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_local_store_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_lru_garbage_collector_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_mutation_queue_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_query_engine_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_remote_document_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/memory_target_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/mutation_queue_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/query_engine_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/reference_set_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/remote_document_cache_test.cc.o Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/target_cache_test.cc.o -o Firestore/core/test/unit/local/firestore_local_test -Wl,-rpath,$HOME/local/homebrew/Cellar/openssl@3/3.4.1/lib lib/libgtest.a lib/libgtest_main.a lib/libgmock.a Firestore/core/libfirestore_core.a Firestore/core/test/unit/local/libfirestore_local_testing.a Firestore/Protos/libfirestore_protos_protobuf.a Firestore/core/test/unit/remote/libfirestore_remote_testing.a Firestore/core/test/unit/testutil/libfirestore_testutil.a lib/libgmock.a lib/libgtest.a Firestore/core/test/unit/remote/libfirestore_remote_testing.a Firestore/core/libfirestore_core.a external/src/leveldb-build/libleveldb.a external/src/snappy-build/libsnappy.a Firestore/core/libfirestore_nanopb.a Firestore/Protos/libfirestore_protos_nanopb.a Firestore/core/libfirestore_util.a Firestore/core/libfirestore_nanopb.a Firestore/Protos/libfirestore_protos_nanopb.a Firestore/core/libfirestore_util.a external/src/grpc-build/libgrpc++.a external/src/grpc-build/third_party/protobuf/libprotobufd.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_check_op.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_leak_check.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_die_if_null.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_conditions.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_message.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_nullguard.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_examine_stack.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_format.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_proto.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_log_sink_set.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_sink.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_entry.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_initialize.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_globals.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_vlog_config_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_fnmatch.a external/src/grpc-build/third_party/abseil-cpp/absl/log/libabsl_log_internal_globals.a external/src/grpc-build/third_party/protobuf/third_party/utf8_range/libutf8_validity.a external/src/grpc-build/libgrpc.a external/src/grpc-build/third_party/abseil-cpp/absl/status/libabsl_statusor.a external/src/grpc-build/libupb_json_lib.a external/src/grpc-build/libupb_textformat_lib.a external/src/grpc-build/libupb_message_lib.a external/src/grpc-build/libupb_base_lib.a external/src/grpc-build/libupb_mem_lib.a external/src/grpc-build/libutf8_range_lib.a external/src/grpc-build/third_party/re2/libre2.a /usr/lib/x86_64-linux-gnu/libz.so external/src/grpc-build/third_party/cares/cares/lib/libcares.a external/src/grpc-build/libgpr.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_reflection.a external/src/grpc-build/third_party/abseil-cpp/absl/container/libabsl_raw_hash_set.a external/src/grpc-build/third_party/abseil-cpp/absl/hash/libabsl_hash.a external/src/grpc-build/third_party/abseil-cpp/absl/hash/libabsl_city.a external/src/grpc-build/third_party/abseil-cpp/absl/hash/libabsl_low_level_hash.a external/src/grpc-build/third_party/abseil-cpp/absl/container/libabsl_hashtablez_sampler.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_config.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_program_name.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_private_handle_accessor.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_commandlineflag.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_commandlineflag_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/status/libabsl_status.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_cord.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_cordz_info.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_cord_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_cordz_functions.a external/src/grpc-build/third_party/abseil-cpp/absl/profiling/libabsl_exponential_biased.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_cordz_handle.a external/src/grpc-build/third_party/abseil-cpp/absl/crc/libabsl_crc_cord_state.a external/src/grpc-build/third_party/abseil-cpp/absl/crc/libabsl_crc32c.a external/src/grpc-build/third_party/abseil-cpp/absl/crc/libabsl_crc_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/crc/libabsl_crc_cpu_detect.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_strerror.a external/src/grpc-build/third_party/abseil-cpp/absl/synchronization/libabsl_synchronization.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_stacktrace.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_symbolize.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_debugging_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/debugging/libabsl_demangle_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/synchronization/libabsl_graphcycles_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/synchronization/libabsl_kernel_timeout_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_malloc_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/types/libabsl_bad_variant_access.a external/src/grpc-build/third_party/abseil-cpp/absl/flags/libabsl_flags_marshalling.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_str_format_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_distributions.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_seed_sequences.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_pool_urbg.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_randen.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_randen_hwaes.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_randen_hwaes_impl.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_randen_slow.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_platform.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_internal_seed_material.a external/src/grpc-build/third_party/abseil-cpp/absl/types/libabsl_bad_optional_access.a external/src/grpc-build/third_party/abseil-cpp/absl/random/libabsl_random_seed_gen_exception.a $HOME/local/homebrew/Cellar/openssl@3/3.4.1/lib/libssl.so $HOME/local/homebrew/Cellar/openssl@3/3.4.1/lib/libcrypto.so external/src/grpc-build/libaddress_sorting.a -ldl -lm -lrt external/src/nanopb-build/libprotobuf-nanopbd.a external/src/grpc-build/third_party/abseil-cpp/absl/time/libabsl_time.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_strings.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_strings_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/strings/libabsl_string_view.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_base.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_spinlock_wait.a -lrt external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_throw_delegate.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_raw_logging_internal.a external/src/grpc-build/third_party/abseil-cpp/absl/base/libabsl_log_severity.a external/src/grpc-build/third_party/abseil-cpp/absl/numeric/libabsl_int128.a external/src/grpc-build/third_party/abseil-cpp/absl/time/libabsl_civil_time.a external/src/grpc-build/third_party/abseil-cpp/absl/time/libabsl_time_zone.a && : /usr/bin/ld: Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/globals_cache_test.cc.o: in function `firebase::firestore::local::(anonymous namespace)::GlobalsCacheTest_ReturnsSavedSessionToken_Test::TestBody()::{lambda()#1}::operator()() const': $HOME/work/ios/main/Firestore/core/test/unit/local/globals_cache_test.cc:52:(.text+0x9e1): undefined reference to `firebase::firestore::nanopb::ByteString::ByteString(std::basic_string_view<char, std::char_traits<char> >)' /usr/bin/ld: $HOME/work/ios/main/Firestore/core/test/unit/local/globals_cache_test.cc:59:(.text+0xb57): undefined reference to `firebase::firestore::nanopb::ByteString::ByteString(std::basic_string_view<char, std::char_traits<char> >)' /usr/bin/ld: Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_key_test.cc.o: in function `firebase::firestore::local::(anonymous namespace)::DocMutationKey(std::basic_string_view<char, std::char_traits<char> >, std::basic_string_view<char, std::char_traits<char> >, int)': $HOME/work/ios/main/Firestore/core/test/unit/local/leveldb_key_test.cc:50:(.text+0x17a): undefined reference to `firebase::firestore::local::LevelDbDocumentMutationKey::Key[abi:cxx11](std::basic_string_view<char, std::char_traits<char> >, firebase::firestore::model::DocumentKey const&, int)' /usr/bin/ld: Firestore/core/test/unit/local/CMakeFiles/firestore_local_test.dir/leveldb_key_test.cc.o: in function `firebase::firestore::local::(anonymous namespace)::RemoteDocumentReadTimeKey(std::basic_string_view<char, std::char_traits<char> >, long, std::basic_string_view<char, std::char_traits<char> >)': 

#no-changelog

[paulb777]

Thanks @dconeybe !