How to specify target architecture (x86_64 or arm/native) when building qmake project on M1?

[jsulm]

@Violet-Giraffe said in How to specify target architecture (x86_64 or arm/native) when building qmake project on M1?:

How to specify the desired architecture with qmake and Qt 5.15.2?

By calling qmake from Qt for that architecture.

[Violet Giraffe]

@jsulm, I already do, this is Qt 5.15.2 clang_64 (and 5.15.2 only exists for x86_64 on Mac, I believe).

[SGaist]

@Violet-Giraffe hi,

Your other project likely uses libraries that are universal, meaning that they embed both x86_64 and arm64 symbols.

From memory, Qt 5.15.2 is single arch so you would need to build it yourself for the M1.

[Violet Giraffe]

@SGaist, hi, thanks for chiming in! Let me clarify and expand on the question.

1. I do not want to build for M1/ARM, I only want a pure x86_64 build. So it's no problem that Qt 5.15.2 doesn't support M1.
2. Some of my own libraries, built by this project, were compiled for M1, and some others for x86_64. It's not even that my M1 binaries cannot be linked with x64 Qt - no, parts of my own project and my own code are being built inconsistently.
3. The other project is also a C++ qmake subdirs project that uses Qt 5.15.2 and it builds fine, but that didn't help me to figure out why or what the problem is.

So in short - I don't want to target M1, I want to stop it from targeting M1 and force x86_64 instead.

[Violet Giraffe]

Found it! The required compiler flag is -arch x86_64

[Mehrshad]

Excuse me, but I'm still having a similar problem. I did as you said, and ran ./qmake -set arch x86_64, but nothing changed in action. Could you state more specifically what you did to get it fixed?

More details:
I'm on an Intel Mac running macOS 12.6.8 and Xcode 14.2. The thing is, I had been using Qt 6.4.2 and Qt Creator 10.0.2, but after a series of Qt-related upgrades, I eventually ended up with Qt 6.5.2 and Qt Creator 11.0.0. Right now, Qt Creator cannot identify any Qt-related classes or identifiers, and I'm getting the same error as you did under Preferences, Kits, Qt Versions. However, projects are being built using the play button.

[jsulm]

@Mehrshad said in How to specify target architecture (x86_64 or arm/native) when building qmake project on M1?:

and I'm getting the same error as you did under Preferences, Kits, Qt Versions

What error is that?
What exact Qt version did you install?

[Mehrshad]

@jsulm I'm sorry. I realize I had replied on the wrong topic. I posted an all-new topic here. I would be more than glad if you could check it out and tell me what you think.

[Violet Giraffe]

For Qt 6.5.3:

QMAKE_APPLE_DEVICE_ARCHS = x86_64

or QMAKE_APPLE_DEVICE_ARCHS = x86_64 arm64 to create a universal binary, but I have not tested that.

[Austin K]

After creating a 64 bit arm64 binary for m1 on OSX Im getting an error with macdeployqt:

mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64')

(mach-o file, but is an incompatible architecture (have 'x86_64', need 'arm64e' or 'arm64')), '~/build/arm64/myapp/Contents/MacOS/QtQuickControls2.framework/Versions/5/QtQuickControls2' (no such file), '~build/arm64/myapp/Contents/Frameworks/QtQuickControls2.framework/Versions/5/QtQuickControls

When I look at the actual app it is a 64 bit arm app.

Using Qt 5.15.17 - latest and greatest.

When running the application in Qt Creator it runs fine. macdeployqt is not creating a correct binary for arm64. However it works fine for x86_64.

[SGaist]

@Austin-K hi and welcome to devnet,

AFAIK 5.15.17 is currently a commercial only release so you should check with the Qt Company what is happening with macdeployqt.

[Austin K]

@SGaist to I actually was able to fix this.

I had to ensure I was using the arm 64-bit version of macdeployqt contained in /macos/

~/Qt5.15.17/5.15.17/clang_64/bin/macdeployqt
~/Qt5.15.17/5.15.17/macos/bin/macdeployqt

Its important to use the correct one for the architecture you are building for.

Thank you.