hard to say how serious they are but maybe a good idea to take a look /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/mariadb_config/mariadb_config.c:9:49: warning: backslash and newline separated by space #define LIBS "-L/usr/lib64/mysql/ -lmariadb "\ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_lib.c: In function 'mariadb_get_infov': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_lib.c:3872:30: warning: this statement may fall through [-Wimplicit-fallthrough=] *((unsigned long *)arg)= mysql->client_flag; ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_lib.c:3875:3: note: here default: ^~~~~~~ In file included from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/plugin/handler_socket/libhsclient/hstcpcli.cpp:13:0: /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/plugin/handler_socket/libhsclient/hstcpcli.hpp:33:14: warning: 'template<class> class std::auto_ptr' is deprecated [-Wdeprecated-declarations] typedef std::auto_ptr<hstcpcli_i> hstcpcli_ptr; ^~~~~~~~ In file included from /usr/include/c++/7/memory:80:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/plugin/handler_socket/libhsclient/hstcpcli.hpp:15, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/plugin/handler_socket/libhsclient/hstcpcli.cpp:13: /usr/include/c++/7/bits/unique_ptr.h:51:28: note: declared here template<typename> class auto_ptr; /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c: In function 'dtoa': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c:1465:14: warning: this statement may fall through [-Wimplicit-fallthrough=] leftright= 0; ~~~~~~~~~^~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c:1467:3: note: here case 4: ^~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c:1473:14: warning: this statement may fall through [-Wimplicit-fallthrough=] leftright= 0; ~~~~~~~~~^~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c:1475:3: note: here case 5: ^~~~ At top level: /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/ma_dtoa.c:1161:21: warning: 'tinytens' defined but not used [-Wunused-const-variable=] static const double tinytens[]= ^~~~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_dyncol.c: In function 'mariadb_dyncol_val_double': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_dyncol.c:4044:7: warning: this statement may fall through [-Wimplicit-fallthrough=] { ^ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_dyncol.c:4060:5: note: here case DYN_COL_DATETIME: ^~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_dyncol.c:4050:15: warning: argument 1 null where non-null expected [-Wnonnull] *dbl= strtod(str, &end); ^~~~~~~~~~~~~~~~~ In file included from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/include/ma_global.h:168:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/libmariadb/mariadb_dyncol.c:64: /usr/include/stdlib.h:126:15: note: in a call to function 'strtod' declared here extern double strtod (const char *__restrict __nptr, ^~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/unittest/libmariadb/t_aurora.c: In function 'test_reconnect': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/libmariadb/unittest/libmariadb/t_aurora.c:100:3: warning: ignoring return value of 'system', declared with attribute warn_unused_result [-Wunused-result] system("/usr/local/aws/bin/aws rds failover-db-cluster --db-cluster-identifier instance-1-cluster"); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/mysys/my_lib.c: In function 'my_dir': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/mysys/my_lib.c:144:3: warning: 'readdir_r' is deprecated [-Wdeprecated-declarations] while (!(READDIR(dirp,(struct dirent*) dirent_tmp,dp))) ^~~~~ In file included from /usr/include/features.h:410:0, from /usr/include/pthread.h:21, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_global.h:278, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/mysys/mysys_priv.h:19, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/mysys/my_lib.c:19: /usr/include/dirent.h:189:12: note: declared here extern int __REDIRECT (readdir_r, /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/myisamchk.c: In function 'myisamchk': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/myisamchk.c:1411:22: warning: '%ld' directive writing between 1 and 10 bytes into a region of size 8 [-Wformat-overflow=] sprintf(null_pos,"%ld",(long) keyseg->null_pos+1); ^~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/myisamchk.c:1411:21: note: directive argument in the range [1, 4294967296] sprintf(null_pos,"%ld",(long) keyseg->null_pos+1); ^~~~~ In file included from /usr/include/stdio.h:939:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_global.h:322, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_base.h:23, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/myisam.h:26, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/myisamdef.h:20, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/fulltext.h:21, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/myisamchk.c:18: /usr/include/bits/stdio2.h:33:10: note: '__builtin___sprintf_chk' output between 2 and 11 bytes into a destination of size 8 return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ __bos (__s), __fmt, __va_arg_pack ()); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/mi_test3.c: In function 'test_write': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/mi_test3.c:367:30: warning: '%7ld' directive writing between 7 and 11 bytes into a region of size 8 [-Wformat-overflow=] sprintf((char*) record.id,"%7ld",(long) getpid()); ^~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/mi_test3.c:367:29: note: directive argument in the range [-2147483648, 2147483647] sprintf((char*) record.id,"%7ld",(long) getpid()); ^~~~~~ In file included from /usr/include/stdio.h:939:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_global.h:322, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_base.h:23, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/myisam.h:26, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/myisam/mi_test3.c:20: /usr/include/bits/stdio2.h:33:10: note: '__builtin___sprintf_chk' output between 8 and 12 bytes into a destination of size 8 return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ __bos (__s), __fmt, __va_arg_pack ()); /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_chk.c: In function 'maria_chk': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_chk.c:1703:22: warning: '%ld' directive writing between 1 and 10 bytes into a region of size 8 [-Wformat-overflow=] sprintf(null_pos,"%ld",(long) keyseg->null_pos+1); ^~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_chk.c:1703:21: note: directive argument in the range [1, 4294967296] sprintf(null_pos,"%ld",(long) keyseg->null_pos+1); ^~~~~ In file included from /usr/include/stdio.h:939:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_global.h:322, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_base.h:23, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/maria.h:22, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_def.h:18, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/ma_fulltext.h:20, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_chk.c:18: /usr/include/bits/stdio2.h:33:10: note: '__builtin___sprintf_chk' output between 2 and 11 bytes into a destination of size 8 return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ __bos (__s), __fmt, __va_arg_pack ()); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/ma_test3.c: In function 'test_write': /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/ma_test3.c:365:30: warning: '%7ld' directive writing between 7 and 11 bytes into a region of size 8 [-Wformat-overflow=] sprintf((char*) record.id,"%7ld", (long) getpid()); ^~~~ /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/ma_test3.c:365:29: note: directive argument in the range [-2147483648, 2147483647] sprintf((char*) record.id,"%7ld", (long) getpid()); ^~~~~~ In file included from /usr/include/stdio.h:939:0, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_global.h:322, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/my_base.h:23, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/include/maria.h:22, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/maria_def.h:18, from /home/builduser/rpmbuild/BUILD/mariadb-10.2.8/storage/maria/ma_test3.c:20: /usr/include/bits/stdio2.h:33:10: note: '__builtin___sprintf_chk' output between 8 and 12 bytes into a destination of size 8 return __builtin___sprintf_chk (__s, __USE_FORTIFY_LEVEL - 1, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ __bos (__s), __fmt, __va_arg_pack ()); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~