Mysql drivers built but qt can not find them

[hskoglund]

You need to nuke (delete) the previous build/directory
or do a new download and then try qt-cmake again (with -DCMAKE_OSX_ARCHITECTURES="arm64" added at the end)

[DeadSo0ul]

@hskoglund If I do understand you correctly I had done it before running the command as the files built were easy to track

Ignore the directory where I build as I overkill the whole process for no reason

I did try to build in another directory but without success

[hskoglund]

No I mean delete all of the /Users/boyankiovtorov/Qt/6.7.0/Src/qtbase/src/plugins/sqldrivers directory
If you don't have a copy easiest is just to download the 6.7.0 source again.

[hskoglund]

Here's how I built MySQL (some time ago :-) using Homebrew
Download Qt sources in ~/Downloads then do these commands:

brew install mysql
cd ~/Downloads/qt-everywhere-src-6.7.0/qtbase/src/plugins/sqldrivers
~/Qt/6.7.0/macos/bin/qt-cmake -DMySQL_LIBRARY=/usr/local/opt/mysql/lib/libmysqlclient.dylib -DMySQL_INCLUDE_DIR=/usr/local/opt/mysql/include/mysql  -DCMAKE_OSX_ARCHITECTURES="arm64" .
make

[DeadSo0ul]

@hskoglund
It was the same way I built the driver for 6.2 but still not working

cd ~/Downloads/qt-everywhere-src-6.7.0/qtbase/src/plugins/sqldrivers
boyankiovtorov@Boyans-MacBook-Air sqldrivers % ~/Qt/6.7.0/macos/bin/qt-cmake -DMySQL_LIBRARY=/opt/homebrew/opt/mysql/lib/libmysqlclient.dylib -DMySQL_INCLUDE_DIR=/opt/homebrew/opt/mysql/include/mysql  -DCMAKE_OSX_ARCHITECTURES="arm64" .

it gives a warning that ninja is recommended

CMake Warning at /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtBuildHelpers.cmake:12 (message):
  The officially supported CMake generator for building Qt is Ninja / Ninja
  Multi-Config.  You are using: 'Unix Makefiles' instead.  Thus, you might
  encounter issues.  Use at your own risk.
Call Stack (most recent call first):
  /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtBuildHelpers.cmake:381 (qt_internal_validate_cmake_generator)
  /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtBuild.cmake:4 (qt_internal_setup_build_and_global_variables)
  /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtSetup.cmake:6 (include)
  /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtBuildRepoHelpers.cmake:21 (include)
  /Users/boyankiovtorov/Qt/6.7.0/macos/lib/cmake/Qt6/QtBuildRepoHelpers.cmake:112 (qt_build_internals_set_up_private_api)
  CMakeLists.txt:26 (qt_prepare_standalone_project)

but the error is still the same

[ 41%] Linking CXX shared module ../plugins/sqldrivers/libqsqlmysql.dylib
ld: warning: ignoring file '/opt/homebrew/Cellar/mysql/8.3.0_1/lib/libmysqlclient.23.dylib': found architecture 'arm64', required architecture 'x86_64'

[hskoglund]

If you check the MySql dll with file, e.g.:

file /opt/homebrew/opt/mysql/lib/libmysqlclient.dylib 

If it says "x86_64" then you need to download/install a dylib/dll with the same name but has the architecture "arm64"

[DeadSo0ul]

@hskoglund It is arm64

/opt/homebrew/opt/mysql/lib/libmysqlclient.dylib: Mach-O 64-bit dynamically linked shared library arm64

[hskoglund]

Hi, indeed I just tried it myself and something's changed with 6.7.0, that switch -DCMAKE_OSX_ARCHITECTURES="arm64" does not seem to work anymore :-(
I remember that was a bug before and that you had to edit some cmake text file, i'll check...

[hskoglund]

Hi, found it: https://forum.qt.io/topic/136231/mysql-plugin-on-m1-mac/10

Adding -DCMAKE_OSX_ARCHITECTURES="arm64" has not been sufficient for a looong time.

The good news is that for Qt 6.7.0 it's slightly easier. Anyway there are two things that has be fixed: build with Nnja and manually edit the Ninja build file before issuing the cmake --build .

So the qt-cmake command should be:
~/Qt/6.7.0/macos/bin/qt-cmake -GNinja -DMySQL_LIBRARY=/opt/homebrew/opt/mysql/lib/libmysqlclient.dylib -DMySQL_INCLUDE_DIR=/opt/homebrew/opt/mysql/include/mysql -DCMAKE_OSX_ARCHITECTURES="arm64" .

Once it's done, do this magic command:

sed -i -e 's/-arch x86_64/-arch arm64/g' build.ninja

Then proceed with the usual:

cmake --build .

Don't forget to nuke the sqldrivers directory first :-)

[DeadSo0ul]

@hskoglund
That worked! Thank you so much.