[Interest] Q_ATOMIC_INT64_IS_SUPPORTED: Qt Compile errors on macOS

[Thiago Macieira]

On Wednesday, 26 June 2019 16:22:48 PDT Hamish Moffatt wrote:
> My point was that the file is entirely managed by qmake, so (IMHO) qmake
> should deal with it if the data is now stale.

It's very difficult to do that. The whole reason the file exists is to avoid 
having to call the compiler to find out its details every time that qmake is 
started. In order to do what you are asking for, we need to call out to the 
compiler, which defeats the purpose.

Also, changing the compiler does require erasing your build and starting over 
anyway. For example, if you're using precompiled headers, a version update of 
the compiler (even patch level) can invalidate those files and neither qmake 
nor Make will notice that.

My point is that this is a bigger problem than just the .qmake.stash file. I 
really recommend just rm -rf your build.

PS: make your life easier and don't configure Qt from inside the sources.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel System Software Products