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The following compiler is issuing a warning that I cannot determine whether it is bogus or not:
gcc-12 (Debian 12-20220222-1) 12.0.1 20220222 (experimental) [master r12-7325-g2f59f067610]
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10.2 ed691eca99da36f3c20558edd08786224539a7ab
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/mariadb/10.2o/sql/item_func.cc: In member function ‘bool udf_handler::fix_fields(THD*, Item_func_or_sum*, uint, Item**)’:
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/mariadb/10.2o/sql/item_func.cc:3507:39: error: ‘<anonymous>’ may be used uninitialized [-Werror=maybe-uninitialized]
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3507 | if (!(buffers=new String[arg_count]) ||
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| ^
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/mariadb/10.2o/sql/item_func.cc:3507:39: note: ‘<anonymous>’ was declared here
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3507 | if (!(buffers=new String[arg_count]) ||
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| ^
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cc1plus: all warnings being treated as errors
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The 10.6 version of the same looks a little different:
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10.6 fd5a6d0f75f1435e6b15409516ccba54b8fee145
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/mariadb/10.6/sql/item_func.cc: In member function ‘bool udf_handler::fix_fields(THD*, Item_func_or_sum*, uint, Item**)’:
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/mariadb/10.6/sql/item_func.cc:3513:55: error: ‘<anonymous>’ may be used uninitialized [-Werror=maybe-uninitialized]
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3513 | if (!(buffers=new (thd->mem_root) String[arg_count]) ||
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| ^
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/mariadb/10.6/sql/item_func.cc:3513:55: note: ‘<anonymous>’ was declared here
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3513 | if (!(buffers=new (thd->mem_root) String[arg_count]) ||
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| ^
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The following patch (below, it is for 10.6) would work around it:
diff --git a/sql/item_func.cc b/sql/item_func.cc
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index 92f6255d958..c5f14dcd64f 100644
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--- a/sql/item_func.cc
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+++ b/sql/item_func.cc
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@@ -3448,6 +3448,10 @@ void udf_handler::cleanup()
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}
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}
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+#if defined __GNUC__ && __GNUC__ == 12
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+#pragma GCC diagnostic push
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+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
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+#endif
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bool
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udf_handler::fix_fields(THD *thd, Item_func_or_sum *func,
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@@ -3612,6 +3616,9 @@ udf_handler::fix_fields(THD *thd, Item_func_or_sum *func,
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}
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DBUG_RETURN(FALSE);
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}
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+#if defined __GNUC__ && __GNUC__ == 12
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+#pragma GCC diagnostic pop
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+#endif
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bool udf_handler::get_arguments()
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If I replace the -Og with -O2 or -O3 or omit it altogether, no warning will be issued.
Here is a slightly truncated compiler invocation that will issue this warning but also some others:
g++-12 -DHAVE_CONFIG_H -DMYSQL_SERVER -I/mariadb/10.6/wsrep-lib/include -I/mariadb/10.6/wsrep-lib/wsrep-API/v26 -I/dev/shm/10.6/include -I/mariadb/10.6/include -I/mariadb/10.6/sql -Og -Wall -Wno-unused-parameter -std=gnu++11 -MD -MT sql/CMakeFiles/sql.dir/item_func.cc.o -MF sql/CMakeFiles/sql.dir/item_func.cc.o.d -o sql/CMakeFiles/sql.dir/item_func.cc.o -c /mariadb/10.6/sql/item_func.cc
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