[Development] QProperty and library coding guide

[Thiago Macieira]

On Friday, 17 July 2020 02:05:48 PDT Lars Knoll wrote:
> Some older embedded toolchains don’t have the flag neither.

Then give them an option to opt out, at Qt configure time. That's a flag on 
the same level as using -mfloat-abi=softfp instead of -mfloat-abi=hard or 
using -stdlib=libc++ for Clang: completely ABI incompatible. But embedded 
devices that build everything for the image in question can afford to make ABI 
choices per version.

The same configure (ahem, cmake!) flag can be used to turn it on when it isn't 
on by default. Such as when a new version of a compiler supports in 2021 or 
later. Read: MSVC.

You may want to add this fact to archdetect.cpp (QSysInfo::buildAbi()). We can 
also fix this automatically by having a variable that depends on the size of 
QObject.

I'll just post this and let you ponder the consequences of this choice for 
Linux:
https://godbolt.org/z/nhex5x
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel System Software Products