configure the build: -Wno-dev: what to do with it?

[BwvB]

I use to compile Qt from the sources in the tar-file that can be found at
https://download.qt.io/archive/qt/...

After unpacking I run the "configure" script to obtain the build configuration.
I use CMake with ninja as the generator

During the configuration, tons of warnings fly over the screen, many of them with the mysterious remark
"This warning is for project developers. Use -Wno-dev to suppress it."

How am I supposed to provide this flag? It is not an option of the configure script.

Thanks
Bertwim

[Christian Ehrlicher]

Simply ignore it. Why do you bother?

[BwvB]

Because the amount of blurp that is thrown over you obscures the real messages. I thought that is obvious.

[Christian Ehrlicher]

Then modify the configure script to pass this.
The important stuff is in the summary at the end where you won't find such messages.

[SimonSchroeder]

I'm not an expert in this, but as I understand it -Wno-dev is not a parameter for the compiler but for cmake itself. So, when invoking CMake, just provide this as additional parameter: cmake -Wno-dev ... (where ... are the parameters you usually provide to cmake).

[Christian Ehrlicher]

@SimonSchroeder You are correct but the configure script provided by Qt (which more or less only calls cmake) has no option to pass this. Otoh when compiling Qt from source I would say you're a developer and you may be interested in these warnings.

[BwvB]

@Christian-Ehrlicher I agree with @SimonSchroeder that such an option is needed. Being a developer does not mean that one also is a Qt-developer. I am only a Qt user, but I do need to build from source. If there would be only a few of these warnings it would be bearable, but the number of them exceeds the pain barrier. Moreover, in between all this noise there are other comments/warnings that are relevant for a 'personal' build.

[Christian Ehrlicher]

Then modify the configure script. Best provide a patch so it gets properly upstreamed

[BwvB]

@Christian-Ehrlicher Well, I tried the obvious, i.e. adding the option -Wno-dev to the two lines with 'cmake' in the configure script. That didn't work. Hopefully, somebody who understands Qt's cmake-building can do it.