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The mysql_stmt_store_result function can return an error, even though mysql_stmt_errno(), mysql_stmt_sqlstate(), and mysql_stmt_error() do not actually contain information about an error. This may be related to running stored procedures that contain a cursor.
To reproduce, load the attached schema:
sudo mysql -u root db1 < cursortest.sql
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And then build the attached program:
g++ -ggdb -c $(mariadb_config --cflags) cursortest.cpp
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g++ -o cursortest cursortest.o $(mariadb_config --libs)
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And then run the program.
At that point, you should see an empty error:
$ ./cursortest
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Query: CALL testCursor()
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Failed to store result. Error 0 (00000):
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Result set #1 had 0 rows
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Received 1 result sets
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Query: CALL testNoCursor()
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Segmentation fault
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See CONC-425 about the segmentation fault.
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cursortest.cpp