[Development] 64-bit QFlags support

[Thiago Macieira]

On Sunday 11 August 2024 10:31:06 GMT-7 Thiago Macieira wrote:
> It might be possible to consult the string array and avoid having to have
> string indices all over the place. This will require some more testing,
> especially with the QtOpcUA::NodeIds massive listing.
> 
> I may have a line of sight to generating the string table, but that
> definitely requires C++20 for the ability to have literal types in template
> parameters.

Update: 

I had to rewrite the code that was using std::tuple with our own, hand-rolled 
template pack holder because libstdc++'s std::tuple causes GCC to run out of 
memory and go into swap hell, while Clang sops at a hard limit (libc++'s 
std::tuple isn't affected).

But I managed to make it work and compile with VS2022, Clang 18, GCC 14, and 
whatever Clang comes with XCode. I even got the metatype support I mentioned 
above working. I'm running it through the CI now to see if there's anything I 
missed and if QNX and INTEGRITY will join us or if they will keep the old moc-
generated content. I will not spend any time at all trying to understand 
problems exclusive to them.

The compilation times are expected to increase, but not by much. I tested 
tst_qstringapisymmetry, which has 787 slots, and compilation times went up 
between 6.5 and 10% (tested in debug mode).


-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Principal Engineer - Intel DCAI Platform & System Engineering
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