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Now that MDEV-26272 has been fixed and a cmake -DWITH_UBSAN=ON build with clang can pass the server bootstrap, we can find more undefined behaviour that is not flagged by GCC. Here is an example:
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10.4 832e96deb6f368591dcb35a4fa33b2fd770aa17a
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/mariadb/10.4/storage/innobase/handler/ha_innodb.cc:1821:9: runtime error: call to function mysql_sys_var_long(THD*, int) through pointer to incorrect function type 'unsigned long *(*)(THD *, int)'
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This is flagged for the function thd_lock_wait_timeout(), which simply accesses a data member that has been defined as follows:
static MYSQL_THDVAR_ULONG(lock_wait_timeout, PLUGIN_VAR_RQCMDARG,
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"Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout.",
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NULL, NULL, 50, 0, 1024 * 1024 * 1024, 0);
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// ...
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static struct st_mysql_sys_var* innobase_system_variables[]= {
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// ...
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MYSQL_SYSVAR(lock_wait_timeout),
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// ...
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NULL
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};
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maria_declare_plugin(innobase)
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{
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// ...
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innobase_system_variables
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// ...
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},
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// ...
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maria_declare_plugin_end;
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