Qt configure could not find MySQL installation when cross compiling for raspi3?

[IMAN4K]

Hi everyone.
Right to the point, here is my configure command I used:

../configure -release -opengl es2 -no-eglfs -qt-xcb -xcb -sql-mysql -no-use-gold-linker -opensource -confirm-license -nomake examples -nomake tests -make libs -device linux-rasp-pi3-g++ -device-option CROSS_COMPILE=$RPI_TOOLCHAIN -sysroot $RPI_SYSROOT -prefix /usr/local/qt5pi -hostprefix ~/toolchain/qt5 -extprefix ~/toolchain/qt5pi -recheck-all

And here is the mysql confirmation on pi(i haved synced the sysroot to my host machine):

pi@raspberrypi:~ $ mysql_config --version
10.1.38
pi@raspberrypi:~ $ mysql_config --libs
-L/usr/lib/arm-linux-gnueabihf  -lmariadbclient -lpthread -lz -lm -ldl
pi@raspberrypi:~ $ mysql_config --include
-I/usr/include/mysql

But the configure command throw nasty error:

ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed.

config.log for more details:

[...]
looking for library mysql
Trying source 0 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 1 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 2 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 3 (type mysqlConfig) of library mysql ...
mysql_config not found.
  => source produced no result.
Trying source 4 (type inline) of library mysql ...
mysql.h not found in [] and global paths.
  => source produced no result.
Trying source 5 (type inline) of library mysql ...
  => source failed condition 'config.win32'.
Trying source 6 (type inline) of library mysql ...
mysql.h not found in [] and global paths.
  => source produced no result.
test config.qtbase_sqldrivers.libraries.mysql FAILED
[...]

It seems that configure looks for mysql_config in host machine! what should we do?

[Dewy]

You should change '-plugin-sql-mysql' parameter. Remove that and add '-qt-sql-mysql'

As you can see https://doc.qt.io/archives/qt-4.8/configure-options.html for details.

[IMAN4K]

Hi @dewy

That's for Qt4, for new versions (5.12.3 for mine) as the ./configure --help says:

[...]
Database options:

  -sql-<driver> ........ Enable SQL <driver> plugin. Supported drivers:
                         db2 ibase mysql oci odbc psql sqlite2 sqlite tds
                         [all auto]
  -sqlite .............. Select used sqlite3 [system/qt]
[...]

We should use -sql-mysql to enable plugin.

[Dewy]

Hello again,
That's mean, you cannot use plugin type for configure. when I used plugin types, have bugs. So I use that.
For 5.x.x versions, '-sql-mysql'

[IMAN4K]

This post is deleted!

[IMAN4K]

Seems to be a bug reported here QTBUG-50244

Nobody tried to integrate MySQL for a Raspberry Pi project already ?! no workaround?!
Seems strange :(