[foreign] RFR 8220544: Jextract; library dependent header filtering

[Maurizio Cimadamore]

On 14/03/2019 00:14, Jorn Vernee wrote:
> 42 intermediate typedefs seems a bit extreme... 

I agree - I was deliberately exaggerating for the sake of the example :-)

The main point is: a typedef is used to define a 'local' type name; that 
is a type alias that is likely to be used consistently across the 
library - as such, I think we should prioritize aliases introduced by 
the root set, over aliases introduced deeper in the recursion chain.

Concrete example, OpenGL:

typedef void            GLvoid;

When I see this, I can conclude with 99% certainty that the header will 
prefer using GLvoid to just a plain void. Now, in this case, 'void' is a 
primitive, and not another typedef, but the essence doesn't change - the 
header is setting up its own hierarchy of types which will then be used 
uniformly throughout. Leaking type names from lower layers seems a 
source of confusion IMHO.

Maurizio