@JonB Ooh sorry, I did not see that part. the instruction I was following on qt doc did not mention about make install, it was something like this:
cd %QTDIR%\qtbase\src\plugins\sqldrivers
qmake
nmake sub-odbc
And there are two plugin folders
But I did this:
C:\Qt\Qt5.13.2\5.13.2\mingw73_32>cd C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\odbc
C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\odbc>mingw32-make install
mingw32-make -f Makefile.Release install
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
g++ -c -fno-keep-inline-dllexport -O2 -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql\5.13.2 -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql\5.13.2\QtSql -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore\5.13.2 -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore\5.13.2\QtCore -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore -I.moc\release -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.7.25-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\mkspecs\win32-g++ -o .obj\release\qsql_odbc.o qsql_odbc.cpp
g++ -Wl,-s -shared -Wl,-subsystem,windows -Wl,--out-implib,C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\plugins\sqldrivers\libqsqlodbc.a -o ..\plugins\sqldrivers\qsqlodbc.dll .obj/release/qsql_odbc.o .obj/release/main.o .obj/release/moc_qsql_odbc_p.o -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.7.25-win32\lib -LC:\Utils\postgresql\pgsql\lib C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\libQt5Sql.a C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\libQt5Core.a "C:\Program Files (x86)\Windows Kits\10\lib\10.0.17763.0\um\x86\odbc32.lib" .obj\release\qsqlodbc_resource_res.o
copy /y ..\plugins\sqldrivers\qsqlodbc.dll C:\Qt\Qt5.13.2\5.13.2\mingw73_32\plugins\sqldrivers\qsqlodbc.dll
1 file(s) copied.
C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -install qinstall C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
mingw32-make -f Makefile.Debug install
mingw32-make[1]: Entering directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'
g++ -c -fno-keep-inline-dllexport -g -Og -std=c++1z -fno-exceptions -Wall -W -Wextra -Wvla -Wdate-time -Wshift-overflow=2 -Wduplicated-cond -Wno-stringop-overflow -DUNICODE -D_UNICODE -DWIN32 -DMINGW_HAS_SECURE_API=1 -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DQT_DEPRECATED_WARNINGS -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql\5.13.2 -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql\5.13.2\QtSql -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore\5.13.2 -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore\5.13.2\QtCore -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtSql -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\include\QtCore -I.moc\debug -IC:\openssl\include -IC:\Utils\my_sql\mysql-5.7.25-win32\include -IC:\Utils\postgresql\pgsql\include -IC:\Qt\Qt5.13.2\5.13.2\mingw73_32\mkspecs\win32-g++ -o .obj\debug\qsql_odbc.o qsql_odbc.cpp
g++ -shared -Wl,-subsystem,windows -Wl,--out-implib,C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\plugins\sqldrivers\libqsqlodbcd.a -o ..\plugins\sqldrivers\qsqlodbcd.dll .obj/debug/qsql_odbc.o .obj/debug/main.o .obj/debug/moc_qsql_odbc_p.o -LC:\openssl\lib -LC:\Utils\my_sql\mysql-5.7.25-win32\lib -LC:\Utils\postgresql\pgsql\lib C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\libQt5Sqld.a C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\libQt5Cored.a "C:\Program Files (x86)\Windows Kits\10\lib\10.0.17763.0\um\x86\odbc32.lib" .obj\debug\qsqlodbcd_resource_res.o
copy /y ..\plugins\sqldrivers\qsqlodbcd.dll C:\Qt\Qt5.13.2\5.13.2\mingw73_32\plugins\sqldrivers\qsqlodbcd.dll
1 file(s) copied.
C:\Qt\Qt5.13.2\5.13.2\mingw73_32\bin\qmake.exe -install qinstall C:\Qt\Qt5.13.2\5.13.2\Src\qtbase\src\plugins\sqldrivers\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake C:\Qt\Qt5.13.2\5.13.2\mingw73_32\lib\cmake\Qt5Sql\Qt5Sql_QODBCDriverPlugin.cmake
mingw32-make[1]: Leaving directory 'C:/Qt/Qt5.13.2/5.13.2/Src/qtbase/src/plugins/sqldrivers/odbc'