Under MIPS, the atomicity of some operations is not guaranteed and so an alternative implementation with a mutex is used. The compiler complains because the code is trying to change a variable (the mutex) from a const method of a class.
This patch adds "mutable" modifier to the mentioned variable.
diff -urN percona-xtradb-cluster-5.5-5.5.37-25.10+dfsg/sql/query_response_time.cc percona-xtradb-cluster-5.5-5.5.37-25.10+dfsg.minee/sql/query_response_time.cc --- percona-xtradb-cluster-5.5-5.5.37-25.10+dfsg/sql/query_response_time.cc 2014-05-08 00:58:25.000000000 +0000 +++ percona-xtradb-cluster-5.5-5.5.37-25.10+dfsg.minee/sql/query_response_time.cc 2014-07-11 16:55:52.939978748 +0000 @@ -198,7 +198,7 @@ /* The lock for atomic operations on m_count and m_total. Only actually used on architectures that do not have atomic implementation of atomic operations. */ - my_atomic_rwlock_t time_collector_lock; + mutable my_atomic_rwlock_t time_collector_lock; uint32 m_count[OVERALL_POWER_COUNT + 1]; uint64 m_total[OVERALL_POWER_COUNT + 1]; };
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