Details
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Task
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Status: Closed (View Workflow)
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Major
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Resolution: Fixed
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None
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Q3/2026 Server Development
Description
Building InnoDB with GCC at -O1 or above produces a -Wmaybe-uninitialized
warning for every RecordCallback subclass that is constructed with a
captureless lambda as its comparator:
[2/25] Building CXX object storage/innobase/CMakeFiles/innobase.dir/fts/fts0exec.cc.o
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In file included from /usr/include/c++/13/functional:59,
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from /home/thiru/source_code/main_work/storage/innobase/include/row0query.h:29,
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from /home/thiru/source_code/main_work/storage/innobase/include/fts0exec.h:28,
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from /home/thiru/source_code/main_work/storage/innobase/fts/fts0exec.cc:23:
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In copy constructor ‘std::function<_Res(_ArgTypes ...)>::function(const std::function<_Res(_ArgTypes ...)>&) [with _Res = RecordCompareAction; _ArgTypes = {const dtuple_t*, const unsigned char*, const dict_index_t*, const short unsigned int*}]’,
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inlined from ‘RecordCallback::RecordCallback(RecordProcessor, RecordComparator)’ at /home/thiru/source_code/main_work/storage/innobase/include/row0query.h:80:34,
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inlined from ‘CommonTableReader::CommonTableReader()’ at /home/thiru/source_code/main_work/storage/innobase/fts/fts0exec.cc:676:53:
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/usr/include/c++/13/bits/std_function.h:391:17: warning: ‘<anonymous>’ may be used uninitialized [-Wmaybe-uninitialized]
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391 | __x._M_manager(_M_functor, __x._M_functor, __clone_functor);
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| ~~~~^~~~~~~~~~
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/usr/include/c++/13/bits/std_function.h: In constructor ‘CommonTableReader::CommonTableReader()’:
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/usr/include/c++/13/bits/std_function.h:267:7: note: by argument 2 of type ‘const std::_Any_data&’ to ‘static bool std::_Function_handler<_Res(_ArgTypes ...), _Functor>::_M_manager(std::_Any_data&, const std::_Any_data&, std::_Manager_operation) [with _Res = RecordCompareAction; _Functor = CommonTableReader::CommonTableReader()::<lambda(const dtuple_t*, const rec_t*, const dict_index_t*, const rec_offs*)>; _ArgTypes = {const dtuple_t*, const unsigned char*, const dict_index_t*, const short unsigned int*}]’ declared here
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267 | _M_manager(_Any_data& __dest, const _Any_data& __source,
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| ^~~~~~~~~~
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/home/thiru/source_code/main_work/storage/innobase/fts/fts0exec.cc:676:53: note: ‘<anonymous>’ declared here
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676 | sizeof(doc_id_t), 32)) {}
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| ^
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Reproduced with gcc-13.3.0 in release build
